101 Programs to build your Programming Logic [using C Programming]

Most college students feel stiff struggle learning programming logic in college days. Below is list 101 C Programs, which will help you build basic concepts of control structures, conditional statements and so on. Programs are written for basic to advance logic building. These programs have been personally written by me 8-9 years back in my graduation days and were quite helpful to me and all my fellow friends. I hope you all too find them useful. Cheers !

• 001. Write a program to print a string in C language

  #include<stdio.h>
  #include<conio.h>
  main()
  {
    clrscr();
    printf("\nKodeGod.com");
    getch();
  }
  

• 002. Write a program to accept values of two numbers and print their addition

  #include<stdio.h>
  #include<conio.h> 
  main()
  {
   int a,b,c;
   clrscr();
   printf("Enter number 1: ");
   scanf("%d",&a);
   printf("Enter number 2: ");
   scanf("%d",&b);
   c=a+b;
   printf("Addition is   : %d",c);
   getch();
  }
  

• 003. Write a program to accept values of two numbers and print their subtraction

  
  #include<stdio.h>
  #include<conio.h>  
  main()
  {
   int a,b,c;
   clrscr();
   printf("Enter number 1: ");
   scanf("%d",&a);
   printf("Enter number 2: ");
   scanf("%d",&b);
   c=a-b;
   printf("Subtraction   : %d",c);
   getch();
  }
  

• 004. Write a program to accept values of two numbers and print their multiplication in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
   int a,b,c;
   clrscr();
   printf("Enter number 1: ");
   scanf("%d",&a);
   printf("Enter number 2: ");
   scanf("%d",&b);
   c=a*b;
   printf("Multiplication: %d",c);
   getch();
  }
  
  

• 005. Write a program to accept values of two numbers and print their division in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
   float a,b,c;
   clrscr();
   printf("Enter number 1: ");
   scanf("%f",&a);
   printf("Enter number 2: ");
   scanf("%f",&b);
   c=a/b;
   printf("Division is   : %f",c);
   getch();
  }
  
  

• 006. Write a program to print area of a circle. A(circle)= 3.142 * R * R in C language

  
  #include<stdio.h>
  #include<conio.h>  
  main()
  {
   float AREA,R;
   clrscr();
   printf("Enter Radius: ");
   scanf("%f",&R);
   AREA=3.14*R*R;
   printf("Area of the given is : %6.2f",AREA);
   getch();
  }
  
  

• 007. Write a program to print area of a triangle A(Triangle)= 0.5 * B * H in C language

  
  #include<stdio.h>
  #include<conio.h>  
  main()
  {
   float AREA,B,H;
   clrscr();
   printf("Enter Base & Height: ");
   scanf("%f%f",&B,&H);
   AREA=0.5*B*H;
   printf("Area of the given is : %6.2f",AREA);
   getch();
  }
  
  

• 008. Write a program to print simple interest SI = (PNR)/100 in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
   float SI,P,N,R;
   clrscr();
   printf("Enter values of P, N and R: ");
   scanf("%f%f%f",&P,&N,&R);
   SI=(P*N*R)/100;
   printf("Simple interest = : %6.2f",SI);
   getch();
  }
  
  

• 009. Write a program to accept a number from user and print it’s square & cube in C language

  #include<stdio.h> 
  #include<conio.h>  
  main()
  {
   int n, Square, Cube;
   clrscr();
   printf("Enter Number: ");
   scanf("%d",&n);
   Square=n*n;
   Cube=n*n*n;
   printf("\nSquare: %d\nCube: %d",Square,Cube);
   getch();
  }
  
  

• 010. Write a program to accept two values a & b and interchange their values in C language

  #include<stdio.h>
  #include<conio.h>   
  main()
  {
   int a, b, temp;
   clrscr();
   printf("Enter Numbers: ");
   scanf("%d%d",&a,&b);
   printf("\nBefore Swapping..\na=%d,b=%d",a,b); 
   temp=a;
   a=b;
   b=temp;
   printf("\nAfter Swapping..\na=%d,b=%d",a,b);
   getch();
  }
  

• 011. Write a program to accept roll no and marks of 3 subjects of a student, Calculate total of 3 subjects and average in C language

  #include<stdio.h> 
  #include<conio.h>  
  main()
  {
    int roll_no,m1,m2,m3,total;
    float average;
    clrscr();
    printf("Enter roll number : ");
    scanf("%d",&roll_no);
    printf("Enter marks 1 : "); 
    scanf("%d",&m1);
    printf("Enter marks 2 : ");
    scanf("%d",&m2);
    printf("Enter marks 3 : ");
    scanf("%d",&m3);
    total=m1+m2+m3;
    average=total/3.0;
    printf("\nStudent Roll Number : %d",roll_no);
    printf("\nMarks 1 : %d",m1);
    printf("\nMarks 2 : %d",m2);
    printf("\nMarks 3 : %d",m3);
    printf("\nTotal : %d ",total);
    printf("\nAverage : %f ",average);
    getch();
  }
  

• 012. Print following outputs: http:\\www.kodegod.com\new in C language

  #include<stdio.h> 
  #include<conio.h>  
  main()
  {
   clrscr();
   printf("http:\\\\www.kodegod.com\\learn-programming");
   getch(); 
  }
  

• 013. Print the following output in C Language

  

  #include<stdio.h>
  #include<conio.h>  
   main()
   {
    clrscr();
    printf("\n");
    printf("   /\\        \n");
    printf("  //\\\\      \n");
    printf(" ///\\\\\\    \n");
    printf("////\\\\\\\\  \n");
    printf("  |||         \n");
    printf("  |||         \n");
    getch();
   }
  

• 014. Write a program to accept two number and print largest among them in C language

  
  #include<stdio.h>
  
  #include<conio.h>  
  
  main()
  
  {
  
  int a,b;
  
  clrscr();
  
  printf("Enter numbers : ");
  
  scanf("%d%d",&a,&b);
  
  if(a>b)
  
  printf("Largest value is....%d",a);
  
  else
  
  printf("Largest value is....%d",b);
  
  getch();
  
  }
  

• 015. Write a program to accept a number and print if the number is Positive/Negative in C language

  #include<stdio.h>
  #include<conio.h>  
  
  main()
  {
   int n;
   clrscr();
   printf("Enter number..");
   scanf("%d",&n);
   if(n>0)
  	printf("Given number is positive");
   else if(n<0)
  	printf("Given number is negative");
   else
  	printf("Number is Zero");
   getch();
  }
  
  
  

• 016. Write a program to accept a number and check if it is >10, <10 or =10 in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
    int n;
    clrscr();
    printf("enter number...");
    scanf("%d",&n);
    if(n>10)
  	printf("Number is greater than 10");
    else if(n<10)
  	printf("Number is lesser than 10");
    else
  	printf("Number is 10");
    getch();
  }
  
  
  
  

• 017. Write a program to accept a number from user and print if it is even or odd in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
   int n;
   clrscr();
   printf("Enter number...");
   scanf("%d",&n);
   if(n%2==0)
  	printf("Number is even...");
   else
  	printf("Number is odd....");
   getch();
  }
  
  
  

• 018. Write a program to accept a number from user and print if it is divisible by 5 in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
   int n;
   clrscr();
   printf("Enter number...");
   scanf("%d",&n);
   if(n%5==0)
  	printf("Number is divisible by 5.");
   else
  	printf("Number is not divisible by 5.");
   getch();
  }
  
  
  
  

• 019. Write a program to accept a number from user and print if it is multiple of 7 in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
   int n;
   clrscr();
   printf("Enter number...");
   scanf("%d",&n);
   if(n%7==0)
  	printf("Number is multiple of 7");
   else
  	printf("Number is not multiple of 7");
   getch();
  }
  
  
  

• 020. Write a program to accept two numbers from user and compare them in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
   int a,b;
   clrscr();
   printf("Enter numbers...");
   scanf("%d%d",&a,&b);
   if(a>b)
  	printf("a is greater than b");
   else if(b>a)
  	printf("b is greater than a");
   else
  	printf("both are equal");
   getch();
  }
  
  
  

• 021. Write a program to accept three numbers from user and print them in ascending and descending order in C language

  #include<stdio.h>
  void main()
  {
      int a,b,c;
  
      printf("Enter numbers...");
      scanf("%d%d%d",&a,&b,&c);
      if((a>=b)&&(a>=c))
      {
          if(b>=c)
          {
              printf("\n Descending order : %d %d %d",a,b,c);
              printf("\n Ascending order : %d %d %d",c,b,a);
          }
          else
          {
              printf("\n Descending order : %d %d %d",a,c,b);
              printf("\n Ascending order : %d %d %d",b,c,a);
          }
      }
      else if((b>=a)&&(b>=c))
      {
          if(a>=c)
          {
              printf("\n Descending order : %d %d %d",b,a,c);
              printf("\n Ascending order : %d %d %d",c,a,b);
          }
          else
          {
              printf("\n Descending order : %d %d %d",b,c,a);
              printf("\n Ascending order : %d %d %d",a,c,b);
          }
      }
      else if((c>=a)&&(c>=b))
      {
          if(a>=b)
          {
              printf("\n Descending order : %d %d %d",c,a,b);
              printf("\n Ascending order : %d %d %d",b,a,c);
          }
          else
          {
              printf("\n Descending order : %d %d %d",c,b,a);
              printf("\n Ascending order : %d %d %d",a,b,c);
          }
      }
  }
  

• 022. Write a program to calculate roots of a quadratic equations in C language

  x=b^2-4ac
  if x=0 -> only one root ,
  if x>0 -> roots are distinct (–b+x)/2a & (–b-x)/2a
  if x<0 -> roots are imaginary

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
   float x,r1,r2,a,b,c;
   clrscr();
   printf("Enter a,b,c...");
   scanf("%f%f%f",&a,&b,&c);
   x=b*b-4*a*c;
   r1=(-b+x)/2*a;
   r2=(-b-x)/2*a;
   if(x>0)
  		printf("\nRoots are unequal...\n");
   else if(x<0)
  		printf("\nRoots are imaginary...\n");
   else
  		printf("\nRoots are same....\n");
   printf("R1 = %f",r1);
   printf("R2 = %f",r2);
   getch();
  }
  
  
  
  

• 023. Write a program to accept roll number ,and marks for three subjects, print total marks and average, also print grade by considering following conditions

  Avg>=60 Grade A
  Avg<60,Avg >=50 Grade B
  Avg<50,Avg >=40 Grade C

  Grade F.

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
   int RollNumber,m1,m2,m3,total;
   float avg;
   clrscr();
   printf("Enter Roll Number : ");
   scanf("%d",&RollNumber);
   printf("Enter marks for three subjects : ");
   scanf("%d%d%d",&m1,&m2,&m3);
   total=m1+m2+m3;
   avg=total/3.0;
   printf("\nTotal is....... %d",total);
   printf("\nAverage is..... %5.2f %",avg);
   if(avg>=60)
  	printf("\nGrade : A");
  else if((avg>=50)&&(avg<60))
  	printf("\nGrade : B");
   else if((avg>=40)&&(avg<50))
  	printf("\nGrade : C");
   else
  	printf("\nGrade : F");
   getch();
  }
  
  
  

• 024. Write a Program to accept user’s marital status, gender and age to check if he/she is eligible for marriage or not.

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
     int age;
     char MaritalStatus,Gender;
     clrscr();
   printf("Enter MaritalStatus, Gender, Age : (e.g. m,f,25) : ");
     scanf("%c,%c,%d",&MaritalStatus,&Gender,&age);
     if(MaritalStatus=='m')
     {
  		printf("You can not marry!");
     }
     else if(MaritalStatus=='u')
     {
  		if(Gender=='m')
  		{
  			if(age>=21)
  			    printf("You can marry!");
  			else
  			    printf("You can not marry!");
  		}
  		else if(Gender=='f')
  		{
  			if(age>=18)
  			    printf("You can marry!");
  			else
  			    printf("You can not marry!");
  		}
  		else
  		      printf("Invalid input Gender");
     }
     else
  printf("Invalid input Marital Status ");
     getch();
  }
  
  
  

• 025. Write a Program to print numbers 1 to n using while loop in C language

  #include<stdio.h>
  #include<conio.h>   
  main()
  {
    int i=1,n;
    clrscr();
    printf("Enter n : ");
    scanf("%d",&n);
    while(i<=n)
    {
  	   printf("%d\t",i);
  	   i++;
    }
    getch();
  }
  
  
  

• 026. Write a Program to print numbers n to 1 using Do While loop in C language

  #include<stdio.h>
  #include<conio.h>   
  main()
  {
    int i=1,n;
    clrscr();
    printf("Enter n : ");
    scanf("%d",&n);
    i=n;
    do
    {
  	   printf("%d\t",i);
  	   i--;
    }while(i>=1);
    getch();
  }
  
  
  
  

• 027. Write a Program to print first n even numbers in C language

  #include<stdio.h>
  void main()
  {
      int i=1,n,counter=2;
      printf("Enter n : ");
      scanf("%d",&n);
    
      while(i<=n)
      {
          printf("%d\t",counter);
          counter = counter + 2;
          i++;
      }
  }
  

• 028. Write a Program to print first n odd numbers in C language

  #include<stdio.h>
  void main()
  {
      int i=1,n,counter=1;
      printf("Enter n : ");
      scanf("%d",&n);
   
      while(i<=n)
      {
          printf("%d\t",counter);
          counter = counter + 2;
          i++;
      }
  }
  

• 029. Write a Program to accept a number and print the number in reverse order. E.g. if 1324 is the number then the output will be 4231 in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
    int rem,n;
    clrscr();
    printf("Enter n : ");
    scanf("%d",&n);
    while(n>0)
    {
  	   rem=n%10;
  	   printf("%d",rem);
  	   n=n/10;
    }
    getch();
  }
  
  
  

• 030. Write a Program to accept a number and print sum of it’s digits in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
    int rem,sum=0,n
    clrscr();
    printf("Enter n : ");
    scanf("%d",&n);
    while(n>0)
    {
  	   rem=n%10;
  	   sum=sum+rem;
  	   n=n/10;
    }
    printf("Sum of digits....%d",sum);
    getch();
  }
  
  
  

• 031. Write a program to accept a number from user and check if it is Armstrong number or not i.e. 153 = 1^3 + 5^3 + 3^3 = 153 in C language

  #include
  #include
  main()
  {
    int temp,rem,sum=0,n;
    clrscr();
    printf("Enter n : ");
    scanf("%d", &n);
    temp=n;
    while(n > 0)
    {
  	   rem=n%10;
  	   sum=sum+rem*rem*rem;
  	   n=n/10;
    }
    if(temp==sum)
  		printf("Armstrong Number");
    else
  		printf("Not an Armstrong Number");
    getch();
  }
  
  
  

• 032. Write a program to print table of a given number n in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  { 
   int i,n;
   clrscr();
   printf("Enter number : ");
   scanf("%d",&n);
   for(i=1;i<=10;i++)
  	printf("%d X %d = %d\n",n,i,n*i);
   getch();
  }
  
  
  

• 033. Write a program to print sum of given first n numbers in C language

  #include<stdio.h> 
  #include<conio.h>  
  main()
  {
   int n,newn,i,sum=0;
   clrscr();
   printf("Enter number : ");
   scanf("%d",&n);
   printf("Numbers entered....\n");
   for(i=1;i<=n;i++)
   {
  	scanf("%d",&newn);
  	sum=sum+newn;
   }
   printf("Sum of given n digits is... %d",sum);
  }
  
  
  

• 034. Write a program to print following outputs in C language

  * * * * * *
  * * * * * *
  * * * * * *
  * * * * * *
  * * * * * *
  

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,j,n;
  	clrscr();
  	printf("Enter number : ");
  	scanf("%d",&n);
  	for(i=1;i<=n;i++)
  	{
  		for(j=1;j<=n;j++)
  			{
  			 printf("*");
  			}
  		printf("\n");
  	}
  	getch();
  }
  
  
  
  

• 035. Write a program to print following outputs in C language

  *
  * *
  * * *
  * * * *
  * * * * *
  

   
  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,j,n;
  	clrscr();
  	printf("Enter number : ");
  	scanf("%d",&n);
  	for(i=1;i<=n;i++)
  	{
  		for(j=1;j<=i;j++)
  			{
  			 printf("*");
  			}
  		printf("\n");
  	}
  	getch();
  }
  
  
  

• 036. Write a program to print following outputs in C language

  * * * * *
  * * * *
  * * *
  * *
  *
  

  #include<stdio.h> 
  #include<conio.h>  
  main()
  {
  	int i,j,n;
  	clrscr();
  	printf("Enter number : ");
  	scanf("%d",&n);
  	for(i=n;i>=1;i--)
  	{
  		for(j=1;j<=i;j++)
  			{
  			 printf("*");
  			}
  		printf("\n");
  	}
  	getch();
  }
  
  
  

• 037. Write a program to print following outputs in C language

  * * * * *
    * * * *
      * * *
        * *
          *
  

  #include<stdio.h> 
  #include<conio.h>  
  main()
  {
  	int i,j,k,n;
  	clrscr();
  	printf("Enter number : ");
  	scanf("%d",&n);
  	for(i=1;i<=n;i++)
  	{
  		for(k=1;k<i;k++)
  			{
  			 printf(" ");
  			}
  		for(j=i;j<=n;j++)
  			{
  			 printf("*");
  			}
  		printf("\n");
  	}
  	getch();
  }

• 038. Write a program to print following outputs in C language

          *
        * *
      * * *
    * * * *
  * * * * *
  

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,j,k,n;
  	clrscr();
  	printf("Enter number : ");
  	scanf("%d",&n);
  	for(i=n;i>=1;i--)
  	{
  		for(k=1;k<=(n-i);k++)
  			{
  			 printf(" ");
  			}
  		for(j=1;j<=i;j++)
  			{
  			 printf("*");
  			}
  		printf("\n");
  	}
  	getch();
  }
  
  
  

• 039. Write a program to print following outputs in C language

          *
        * * *
      * * * * *
    * * * * * * *
  * * * * * * * * *
  

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,j,k,n;
  	clrscr();
  	printf("Enter number : ");
  	scanf("%d",&n);
  	for(i=1;i<=n;i++)
  	{
  		for(k=1;k<=(n-i);k++)
  			{
  			 printf(" ");
  			}
  		for(j=1;j<=i;j++)
  			{
  			 printf("*");
  			}
  		for(j=2;j<=i;j++)
  			{
  			 printf("*");
  			}
  
  		printf("\n");
  	}
  	getch();
  }
  
  
  

• 040. Write a program to print following outputs in C language

  * * * * * * * * *
    * * * * * * *
      * * * * *
        * * *   
          *
  

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,j,k,n;
  	clrscr();
  	printf("Enter number : ");
  	scanf("%d",&n);
  	for(i=n;i>=1;i--)
  	{
  		for(k=1;k<=(n-i);k++)
  			{
  			 printf(" ");
  			}
  		for(j=1;j<=i;j++)
  			{
  			 printf("*");
  			}
  		for(j=2;j<=i;j++)
  			{
  			 printf("*");
  	}
  
  		printf("\n");
  	}
  	getch();
  }
  
  
  

• 041. Write a program to print following outputs in C language

          *
        * * *
      * * * * *
    * * * * * * *
  * * * * * * * * *
    * * * * * * *
      * * * * *
        * * *   
          *
  

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,j,k,n;
  	clrscr();
  	printf("Enter number : ");
  	scanf("%d",&n);
  
  	for(i=1;i<=n;i++)
  	{
  		for(k=1;k<=(n-i);k++)
  			{
  			 printf(" ");
  			}
  		for(j=1;j<=i;j++)
  			{
  			 printf("*");
  			}
  		for(j=2;j<=i;j++)
  			{
  			 printf("*");
  			}
  
  		printf("\n");
  	}
  
  	for(i=n-1;i>=1;i--)
  	{
  		for(k=1;k<=(n-i);k++)
  			{
  			 printf(" ");
  			}
  		for(j=1;j<=i;j++)
  			{
  			 printf("*");
  			}
  		for(j=2;j<=i;j++)
  			{
  			 printf("*");
  			}
  
  		printf("\n");
  }
  	getch();
  }
  
  
  

• 042. Write a program to print following outputs in C language

  1
  12
  123
  1234
  

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,j,k,n;
  	clrscr();
  	printf("Enter number : ");
  	scanf("%d",&n);
  	for(i=1;i<=n;i++)
  	{
  		for(j=1;j<=i;j++)
  			printf("%d",j);			
  		printf("\n");
  	}
  	getch();
  }
  
  
  

• 043. Write a program to print following outputs in C language

  1
  22
  333
  4444
  

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,j,k,n;
  	clrscr();
  	printf("Enter number : ");
  	scanf("%d",&n);
  	for(i=1;i<=n;i++)
  	{
  		for(j=1;j<=i;j++)
  			printf("%d",i);
  		printf("\n");
  	}
  	getch();
  }
  
  
  

• 044. Write a program to print following outputs in C language

     A
    BBB
   CCCCC
  DDDDDDD
  

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,j,k,n;
  	clrscr();
  	printf("Enter number : ");
  	scanf("%d",&n);
  	//ASCII Code for 'A' is 65
  	for(i=1;i<=n;i++)
  	{
  		for(k=1;k<=(n-i);k++)
  			{
  			 printf(" ");
  			}
  		for(j=1;j<=i;j++)
  			{
  			 printf("%c",64+i);
  			}
  		for(j=2;j<=i;j++)
  			{
  			 printf("%c",64+i);
  			}
  
  		printf("\n");
  	}
  	getch();
  }
  
  
  

• 045. Write a program to print following outputs in C language

  ABCDEEDCBA
  ABCD  DCBA
  ABC    CBA
  AB      BA
  A        A
  

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
    int i,n,j,k;
    clrscr();
    printf("Enter number........");
    scanf("%d",&n);
    for(i=n-1;i>=0;i--)
    {
  		for(j=0;j<=i;j++)
  			printf("%c",65+j);
  		for(k=1;k<(n-i);k++)
  			printf("  ");
  		for(j=i;j>=0;j--)
  			printf("%c",65+j);
  	printf("\n");
    }
    getch();
  }
  
  
  
  

• 046. Write a program to print following outputs in C language

  1
  11
  121
  1231
  12341
  123451
  

  
  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,j,n;
  	clrscr();
  	printf("Enter number...");
  	scanf("%d",&n);
  	for(i=0;i<=n;i++)
  	{
  		for(j=1;j<=i;j++)
  		{
  			printf("%d",j);
  		}
  		printf("1\n");
  	}
  	getch();
  }
  
  

• 047. Write a program to accept a number from user and print it’s factorial in C language

  Eg: factorial of 5 is:-
  5! = 5 * 4 * 3 * 2 * 1=120

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,fact=1,n;
  	clrscr();
  	printf("Enter number...");
  	scanf("%d",&n);
  	for(i=1;i<=n;i++)
  		fact=fact*i;
  	printf("facttorialof the given number is...%d",fact);
  	getch();
  
  }
  

• 048. Write a program to accept a number from user and print if it is prime or not in C language

  #include<conio.h>  
  #include<process.h>
  main()
  {
  	int i,n;
  	clrscr();
  	printf("Enter number...");
  	scanf("%d",&n);
  	for(i=2;i<=n/2;i++)
  	{
  		if(n%i==0)
  		{
  		printf("Not Prime");
  		getch();
  		exit(0);
  		}
  	}
  	printf("Prime ");
  	getch();
  }
  
  
  

• 049. Write a program to accept a number and print prime numbers between 2 and n in C language

  
  #include<stdio.h>
  #include<conio.h>  
  #include<process.h>
  main()
  {
  	int i,flag=1,n,newn;
  	clrscr();
  	printf("Enter number...");
  	scanf("%d",&n);
  	for(newn=2;newn<=n;newn++)
  	{
  		flag=1;
  		for(i=2;i<=newn/2 ;i++)
  		{
  			if(newn%i==0)
  			{
  			flag=0;
  			break;
  			}
  		}
  		if(flag==1)
  			printf("%d ",newn);
  	}
  	getch();
  }
  
  

• 050. Write a program to accept a number and print fibonacci series upto that level in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int pre=1,cur=1,temp,i,n;
          clrscr();
  	printf("Enter number...");
  	scanf("%d",&n);
  	printf("%d\t%d",pre,cur);
  	for(i=3;i<=n;i++)
  		{
  		 temp=cur;
  		 cur=pre+cur;
  		 pre=temp;
  		 printf("\t%d",cur);
  		}
  	getch();
  }
  
  
  

• 051. Write a program to print digits, alphabets in capital and lower case in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i;
  	clrscr();
  	for(i=65;i<=90;i++)
  		  printf("%c  ",i);
  
  	printf("\n\n\n\n");
  	for(i=97;i<=122;i++)
  		  printf("%c  ",i);
  
  	printf("\n\n\n\n");
  	for(i=48;i<=57;i++)
  		  printf("%c\t",i);
  
  	getch();
  }
  
  
  

• 052. Write a program to accept a number n from user and Add n terms of the series in C language

  1/2! + 2/3! + 3/4! + 4/5! + 5/6! + ………

  
  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,j,n;
  	float sum=0,fact=1;
  	clrscr();
  	printf("Enter number....");
  	scanf("%d",&n);
  	for(i=1;i<=n;i++)
  	{
  		fact=1;
  		for(j=1;j<=i+1;j++)
  			fact=fact*j;
  	sum=sum+i/fact;
  	}
  	printf("Sum of the series....%f",sum);
  	getch();
  }
  
  
  
  

• 053. Write a program to read n numbers (Xi) from the user and print out their average and standard deviation. Formulae are

  Average = (Sum of Xi)/n

  
  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int n,i,newn,sum_avg=0;
  	float avg;
  	clrscr();
  	printf("Enter number : ");
  	scanf("%d",&n);
  	printf("Enter numbers...");
  	for(i=1;i<=n;i++)
  	{
  		scanf("%d",&newn);
  		sum_avg=sum_avg+newn;
  	}
  	avg=sum_avg/(float)n; //Type casting.
  
  	printf("\nAverage = %f",avg);
  	getch();
  }
  

• 054. Write a program to print out ASCII chart on a single screen (all 256 characters from 0 to 255) in a tabular form. The ASCII code should be followed by the corresponding character in C language

  
  #include<stdio.h>
  #include<conio.h>  
  main()
  {
   int i;
   clrscr();
   for(i=0;i<=255;i++)
  	printf("%d-%c\t",i,i);
   getch();
  }
  
  
  

• 055. Write a program to print following output

  ******************************* 
  *                             *
  *                             *  
  *                             *
  *******************************
  

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,j;
  	clrscr();
  	for(i=1;i<=80;i++)
  		printf("*");
  	for(i=2;i<=23;i++)
  	{
  		printf("*");
  		for(j=2;j<=79;j++)
  			printf(" ");
  		printf("*");
  	}
  	for(i=1;i<=80;i++)
  		printf("*");
  
  	getch();
  
  }
  
  
  

• 056. Write a program to print following output

  

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
          int i, j;
          clrscr();
          printf("╔");
          for(i=2;i<=79;i++)
                  printf("═");
          printf("╗");
          for(i=2;i<=24;i++)
          {
                  printf("║");
                  for(j=2;j<=79;j++)
                          printf(" ");
                  printf("║");
          }
          printf("╚");
          for(i=2;i<=79;i++)
                  printf("═");
          printf("╝");
   
          getch();
  }
  

• 057. Write a program to accept a single value interger from user and print that integer in words in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int n;
  	clrscr();
  	printf("Enter number...");
  	scanf("%1d",&n);  //%1d to scan single integer
  	switch(n)
  	{
  		case 0 : printf("Zero");break;
  		case 1 : printf("One");break;
  		case 2 : printf("Two");break;
  		case 3 : printf("Three");break;
  		case 4 : printf("Four");break;
  		case 5 : printf("Five");break;
  		case 6 : printf("Six");break;
  		case 7 : printf("Seven ");break;
  		case 8 : printf("Eigth ");break;
  		case 9 : printf("Nine ");break;
  	}
  	getch();
  }
  

• 058. Write a program to accept a number from user and print that number in words but in reverse order in C language

  E.g. 153 -> THREE FIVE ONE

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int n,rem;
  	clrscr();
  	printf("Enter number...");
  	scanf("%d",&n);
  	while(n>0)
  	{
  		rem=n%10;
  		switch(rem)
  		{
  		  case 0 : printf("Zero");break;
  		  case 1 : printf("One");break;
  		  case 2 : printf("Two");break;
  		  case 3 : printf("Three");break;
  		  case 4 : printf("Four");break;
  		  case 5 : printf("Five");break;
  		  case 6 : printf("Six");break;
                    case 7 : printf("Seven");break;
  		  case 8 : printf("Eigth");break;
  		  case 9 : printf("Nine");break;
  		}
  		n=n/10;
  
  	}
  	getch();
  }
  
  
  
  

• 059. Write a Program to accept two numbers and a operator (+, -, *, / from user and complete that particular operation only in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int n,rem,a,b;
  	char op;
  	clrscr();
  	printf("Enter Operator(+,-,*,/)...");
  	scanf("%c",&op);
  	printf("Enter numbers...");
  	scanf("%d%d",&a,&b);
  	switch(op)
  	{
  	case '+' : printf("Result : %d ",a+b);break;
  	case '-' : printf("Result : %d ",a-b);break;
  	case '*' : printf("Result : %d ",a*b);break;
  	case '/' : printf("Result : %d ",a/b);break;
  	default  : printf("Invalid operator....");
  	}
  	getch();
  }
  
  
  

• 060. Write a program to accept two numbers from user and print it’s addition,subtraction,multiplication,division using different functions in C language

  
  #include<stdio.h>
  #include<conio.h>  
  
  int add(int x,int y)
  {
   return(x+y);
  }
  
  int sub(int x,int y)
  {
   return(x-y);
  }
  
  int mul(int x,int y)
  {
   return(x*y);
  }
  
  int div(int x,int y)
  {
   return(x/y);
  }
  
  main()
  {
  	int a,b;
  	clrscr();
  	printf("Enter numbers : \n");
  	scanf("%d%d",&a,&b);
  	printf("\nAddition       : %d\n",add(a,b));
  	printf("\nSubtraction    : %d\n",sub(a,b));
  	printf("\nMultiplication : %d\n",mul(a,b));
  	printf("\nDivision       : %d\n",div(a,b));
  getch();
  }
  
  

• 061. Write a program to accept a number from user and print it’s factorial, check if it prime or not , and print it’s fibbonacci series using different functions in C language

  #include<stdio.h>
  #include<conio.h>
   
  fact(int x)
  {
  	int i,fact=1;
  	for(i=1;i<=x;i++)
  		fact=fact*i;
  	printf("Factorial is : %d",fact);
  }
   
  IsPrime(int x)
  {
  	int i;
  	for(i=2;i<x-1;i++)
  	{
  		if(x%i==0)
  			{
  			printf("\nNot a Prime Number\n");
  			return 0;
  			}
  	}
  	printf("\nIt is a Prime number\n");
  }
   
  fibbo(int x)
  {
  	int pre=1,cur=1,i,temp;
  	printf("%d %d",pre,cur);
  	for(i=3;i<=x;i++)
  	{
  		temp=cur;
  		cur=pre+cur;
  		pre=temp;
  		printf(" %d",cur);
  	}
  }
  main()
  {
  	int n;
  	clrscr();
  	printf("Enter number...");
  	scanf("%d",&n);
  	fact(n);
  	IsPrime(n);
  	fibbo(n);
          getch();
  }

• 062. Write a program to calculate square and cube of a given number in C language

  
  #include<stdio.h>
  #include<conio.h>  
  
  int square(int x)
  {
  	return(x*x);
  }
  
  int qube(int x)
  {
  	return(x*x*x);
  }
  main()
  {
  	int n;
  	clrscr();
  	printf("Enter number.....");
  	scanf("%d",&n);
  	printf("\nSquare : %d\n",square(n));
  	printf("\nQube   : %d\n",qube(n));
  	qube(n);
  	getch();
  }
  
  
  

• 063. Write a program to accept two numbers from user and swap their values using call by reference method in C language

  #include<stdio.h>
  #include<conio.h>  
  #include<process.h>
  
  swap(int *x ,int *y)
  {
  	int temp;
  	temp=*x;
  	*x=*y;
  	*y=temp;
  }
  main()
  {
  	int a,b;
  	clrscr();
  	printf("Enter numbers : ");
  	scanf("%d%d",&a,&b);
          printf("\nBefore Swapping a = %d, b = %d\n",a,b);
  	swap(&a,&b);
  	printf("\nAfter  Swapping a = %d, b = %d\n",a,b);
  	getch();
  }
  
  
  

• 064. Write a program using recursions for fibbonacci series in C language

  
  #include<stdio.h>
  #include<conio.h>  
  #include<process.h>
  fibbo(int pre, int cur ,int x)
  {        int temp;
  	if(x==2)
  	{
  		getch();
  		exit(0);
  	}
  	temp=cur;
  	cur=pre+cur;
  	pre=temp;
  	printf("%d ",cur);
  	fibbo(pre,cur,x-1);
  }
  main()
  {
  	int n,pre=1,cur=1;
  	clrscr();
  	printf("Enter number : ");
  	scanf("%d",&n);
  	printf("%d %d ",pre,cur);
          fibbo(pre,cur,n);
  	getch();
  }
  
  

• 065. Write a program to print factorial of a given number using recursive function in C language

  #include<stdio.h>
  #include<conio.h>  
  #include<process.h>
  
  int fact(int n)
  {
  	int f;
  	if(n==1)
  		return 1;
  	else
  		f=n*fact(n-1);
  	return f;
  }
  main()
  {
  	int n;
  	clrscr();
  	printf("Enter number : ");
  	scanf("%d",&n);
  	printf("\nFactorial is...%d\n",fact(n));
  	getch();
  }
  
  
  

• 066. Write a program to accept a number n from user and then accept n array elements from user and reprint them in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
   int n,i,a[20];
   clrscr();
   printf("Enter number...");
   scanf("%d",&n);
   printf("Enter array elements :\n" );
   for(i=0;i<n;i++)
  	{
  		printf("Enter element %d : ",i+1);
  		scanf("%d",&a[i]);
  	}
   for(i=0;i<n;i++)
  		printf("\nElement %d : %d",i+1,a[i]);
   getch();
  }

• 067. Write a program to accept a number n from user and then accept n array elements from user and reprint them in reverse order of inputs in C language

  #include<stdio.h>
  #include<conio.h> 
  main()
  {
   int n,i,a[20];
   clrscr();
   printf("Enter number...");
   scanf("%d",&n);
   printf("Enter array elements :\n" );
   for(i=0;i<n;i++)
  	{
  		printf("Enter element %d : ",i+1);
  		scanf("%d",&a[i]);
  	}
   for(i=n-1;i>=0;i--)
  		printf("\nElement %d : %d",i+1,a[i]);
   getch();
  }

• 068. Write a program to accept a number n from user and then accept n array elements from user and print addition of those n array elements in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
   int n,i,a[20],sum=0;
   clrscr();
   printf("Enter number...");
   scanf("%d",&n);
   printf("Enter array elements :\n" );
   for(i=0;i<n;i++)
  	{
  		printf("Enter element %d : ",i+1);
  		scanf("%d",&a[i]);
  	}
   
   for(i=0;i<n;i++)
  	sum=sum+a[i];
   printf("\nSum of given array elements is : %d",sum);
   getch();
  }

• 069. Write a program to accept a number n from user and print fibbonacci series up to nth level using arrays in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int a[20],n,i;
  	clrscr();
  	printf("Enter number : ");
  	scanf("%d",&n);
  	a[1]=a[2]=1;
  
  	for(i=3;i<=n;i++)
  		a[i]=a[i-1]+a[i-2];
  
  	for(i=1;i<=n;i++)
  		printf(" %d",a[i]);
  
  	getch();
  }
  
  
  

• 070. Write a program to accept a number n from user and then accept n array elements from user and print maximum and minimum array element from that set of array in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int n,i,a[20];
  	clrscr();
  	printf("Enter number : ");
  	scanf("%d",&n);
  	printf("Enter array elements...\n");
  	for(i=0;i<n;i++)
  	{
  		printf("Enter element %d : ",i+1);
  		scanf("%d",&a[i]);
  	}
   
  	printf("\n\nNegative Elements : \n");
  	for(i=0;i<n;i++)
  		if(a[i]<0)
  			printf("\n%d",a[i]);
   
  	printf("\n\nPositive Elements : \n");
  	for(i=0;i<n;i++)
  		if(a[i]>0)
  			printf("\n%d",a[i]);
   
  	getch();
  }

• 071. Write a program to accept a number n from user and then accept n array elements from user, print positive & Negative numbers separately in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int n,i,a[20];
  	clrscr();
  	printf("Enter number : ");
  	scanf("%d",&n);
  	printf("Enter array elements...\n");
  	for(i=0;i<n;i++)
  	{
  		printf("Enter element %d : ",i+1);
  		scanf("%d",&a[i]);
  	}
   
  	printf("\n\nNegative Elements : \n");
  	for(i=0;i<n;i++)
  		if(a[i]<0)
  			printf("\n%d",a[i]);
   
  	printf("\n\nPositive Elements : \n");
  	for(i=0;i<n;i++)
  		if(a[i]>0)
  			printf("\n%d",a[i]);
   
  	getch();
  }

• 072. Write a program to accept a number n from user and then accept n array elements from user, print these array elements in ascending and descending order in C language

  #include<stdio.h>
  
  main()
  {
      int n,i,a[20],j,temp;
      printf("Enter number : ");
      scanf("%d",&n);
      printf("Enter array elements...\n");
   
      for(i=0;i<n;i++)
      {
          printf("Enter element %d : ",i+1);
          scanf("%d",&a[i]);
      }
   
      for(i=0;i<n;i++)
      {
          for(j=0;j<i;j++)
              if(a[i]<a[j])
              {
                  temp=a[i];
                  a[i]=a[j];
                  a[j]=temp;
              }
      }
   
      printf("\nAscending order....\n");
      for(i=0;i<n;i++)
      {
          printf(" %d ",a[i]);
      }
   
      for(i=0;i<n;i++)
      {
          for(j=0;j<i;j++)
              if(a[i]>a[j])
              {
                  temp=a[i];
                  a[i]=a[j];
                  a[j]=temp;
              }
      }
   
      printf("\nDescending order.....\n");
      for(i=0;i<n;i++)
      {
          printf(" %d ",a[i]);
      }
  }

• 073. Write a program to accept a mXn matrix and reprint it in matrix form in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,j,m,n,a[5][5];
  	clrscr();
  	printf("Enter order of matrix :\n");
          scanf("%d%d",&m,&n);
  	printf("Enter matrix elements.....\n");
  	for(i=0;i<m;i++)
  		for(j=0;j<n;j++)
  			scanf("%d",&a[i][j]);
   
  	for(i=0;i<m;i++)
  	{
  		for(j=0;j<n;j++)
  			printf("%d ",a[i][j]);
  		printf("\n");
  	}
  	getch();
  }

• 074. Write a program to accept two M x N matrices and add them in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,j,m,n,a[5][5],b[5][5],c[5][5];
  	clrscr();
  	printf("Enter order of matrix :\n");
  	scanf("%d%d",&m,&n);
  	printf("Enter matrix elements of first matrix.....\n");
  	for(i=0;i<m;i++)
  		for(j=0;j<n;j++)
  			scanf("%d",&a[i][j]);
   
  	printf("Enter matrix elements of second matrix.....\n");
  	for(i=0;i<m;i++)
  		for(j=0;j<n;j++)
  			scanf("%d",&b[i][j]);
   
  	for(i=0;i<m;i++)
  		for(j=0;j<n;j++)
  			c[i][j]=a[i][j]+b[i][j];
   
  	printf("Resultant matrix .....\n");
  	for(i=0;i<m;i++)
  	{
  		for(j=0;j<n;j++)
  			printf("%d ",c[i][j]);
  		printf("\n");
  	}
  	getch();
  }

• 075. Write a program to accept a M x N matrix and print addition of their array elements in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,j,m,n,a[5][5],sum=0;
  	clrscr();
  	printf("Enter order of matrix :\n");
  	scanf("%d%d",&m,&n);
  	printf("Enter matrix elements.....\n");
  	for(i=0;i<m;i++)
  		for(j=0;j<n;j++)
  			scanf("%d",&a[i][j]);
   
  	for(i=0;i<m;i++)
  		for(j=0;j<n;j++)
  			sum=sum+a[i][j];
   
  	printf("\nSum of matrix elements.....%d",sum);
  	getch();
  }

• 076. Write a program to accept a M x N matrix and print addition of diagonal elements of that matrix in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,j,m,a[5][5],sum=0;
  	clrscr();
  	printf("Enter order of matrix :\n");
  	scanf("%d",&m);
  	printf("Enter matrix elements.....\n");
  	for(i=0;i<m;i++)
  		for(j=0;j<m;j++)
  			scanf("%d",&a[i][j]);
   
  	for(i=0;i<m;i++)
  		for(j=0;j<m;j++)
  			if(i==j)
  				sum=sum+a[i][j];
   
  	printf("\nSum of diagonal elements.....%d",sum);
  	getch();
  }

• 077. Write a program to accept a M x N matrix and print addition of upper triangular matrix elements in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,j,m,a[5][5],sum=0;
  	clrscr();
  	printf("Enter order of matrix :\n");
  	scanf("%d",&m);
  	printf("Enter matrix elements.....\n");
  	for(i=0;i<m;i++)
  		for(j=0;j<m;j++)
  			scanf("%d",&a[i][j]);
   
  	for(i=0;i<m;i++)
  		for(j=0;j<m;j++)
  			if(i<j)
  				sum=sum+a[i][j];
   
  	printf("\nSum of upper triangular elements.....%d",sum);
  	getch();
  }

• 078. Write a program to accept a M x N matrix and print addition of lower triangular matrix elements in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,j,m,a[5][5],sum=0;
  	clrscr();
  	printf("Enter order of matrix :\n");
  	scanf("%d",&m);
  	printf("Enter matrix elements.....\n");
  	for(i=0;i<m;i++)
  		for(j=0;j<m;j++)
  			scanf("%d",&a[i][j]);
   
  	for(i=0;i<m;i++)
  		for(j=0;j<m;j++)
  			if(i>j)
  				sum=sum+a[i][j];
   
  	printf("\nSum of lower triangular elements.....%d",sum);
  	getch();
  }

• 079. Write a program to accept two M X N matrices and print their multiplication in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,j,m,n,k,a[5][5],b[5][5],c[5][5];
  	clrscr();
  	printf("Enter order of matrix :\n");
  	scanf("%d%d",&m,&n);
  	printf("Enter matrix elements of first matrix.....\n");
  	for(i=0;i<m;i++)
  		for(j=0;j<n;j++)
  			scanf("%d",&a[i][j]);
   
  	printf("Enter matrix elements of second matrix.....\n");
  	for(i=0;i<m;i++)
  		for(j=0;j<n;j++)
  			scanf("%d",&b[i][j]);
   
  	for(i=0;i<m;i++)
  		for(j=0;j<n;j++)
  		{
  			c[i][j]=0;
  			for(k=0;k<n;k++)
  				c[i][j]=c[i][j]+a[i][k]*b[k][j];
  		}
   
  	printf("Resultant matrix .....\n");
  	for(i=0;i<m;i++)
  	{
  		for(j=0;j<n;j++)
  			printf("%d ",c[i][j]);
  		printf("\n");
  	}
  	getch();
  }

• 080. Write a program to accept a M x N matrix and print it’s transpose matrix in C language

  #include<stdio.h>
  main()
  {
      int i,j,m,n,a;
      printf("Enter order of matrix :\n");
      scanf("%d%d",&m,&n);
      printf("Enter matrix elements.....\n");
      for(i=0;i<m;i++)
          for(j=0;j<n;j++)
              scanf("%d",&a);
   
      for(i=0;i<n;i++)
      {
          for(j=0;j<m;j++)
              printf("%d ",a);
          printf("\n");
      }
      getch();
  }

• 081. Print string in reverse,its length,in uppercase,lowercase and copy into another string

  #include<stdio.h>
  #include<conio.h>  
  #include<string.h>
  main()
  {
      char *s1,*s2;
      clrscr();
      printf("Enter string : ");
      scanf("%s",s1);
      printf("Reverse String : %s",strrev(s1));
      printf("Lenght: %d",strlen(s1));
      printf("String in UPPER CASE : %s",strupr(s1));
      printf("String in lower case : %s",strlwr(s1));
      strcpy(s2,s1);
      printf("\nCopied string is...%s",s2);
      getch();
  }
  
  
  

• 082. Write a program to accept a string and print no. of aphlabets, digits, special symbols present in it in C language

  #include<stdio.h>
  #include<conio.h>  
  #include<ctype.h>
  main()
  {
  	char *s;
  	int i,alphabets=0,digits=0,symbols=0;
  	clrscr();
  	printf("Enter string : ");
  	scanf("%s",s);
  	for(i=0;s!='\0';i++)
  
  		if(isalpha(s))
  			alphabets++;
  		else if(isdigit(s))
  			digits++;
  		else
  			symbols++;
  
  	printf("\nAphabets : %d",alphabets);
  	printf("\nDigits   : %d",digits);
  	printf("\nSymbols  : %d",symbols);
  	getch();
  }
  
  
  

• 083. Write a program to accept two strings and compare them in C language

  #include<stdio.h>
  #include<conio.h>  
  #include<string.h>
  main()
  {
  	char *s1,*s2;
  	clrscr();
  	printf("Enter string 1 : ");
  	scanf("%s",s1);
  	printf("Enter string 2 : ");
  	scanf("%s",s2);
  
  	if(strcmp(s1,s2)>0)
  		printf("\nString 1 is greater..");
  	else if(strcmp(s1,s2)<0)
  		printf("\nString 2 is greater..");
  	else
  		printf("\nStrings are equal..");
  
  	getch();
  }
  
  
  

• 084. Write a program to accept two strings and concatenate them in C language

  #include<stdio.h>
  #include<conio.h>  
  #include<string.h>
  main()
  {
  	char *s1,*s2;
  	clrscr();
  	printf("Enter string 1 : ");
  	scanf("%s",s1);
  	printf("Enter string 2 : ");
  	scanf("%s",s2);
  	printf("\nConcatinated string is...%s",strcat(s1,s2));
  	getch();
  }
  
  
  
  

• 085. Write a program to print length of a given string in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,len=0;
  	char *s;
  	clrscr();
  	printf("Enter the string....");
  	scanf("%s",s);
  	for(i=0;s!='\0';i++)
  		len++;
  	printf("The lenth of the string is...%d",len);
  	getch();
  }
  
  
  

• 086. Write a program to copy a string into another string in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i;
  	char *s1,*s2;
  	clrscr();
  	printf("Enter the string 1....");
  	scanf("%s",s1);
  	for(i=0;s1!='\0';i++)
  	{
  		s2;
  	}
  	s2='\0';
  	printf("The copied string is...%s",s2);
  	getch();
  }
  
  
  
  

• 087. Write a program to convert given string to UPPER CASE in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i;
  	char *s1;
  	clrscr();
  	printf("Enter the string 1....");
  	scanf("%s",s1);
  
  	for(i=0;s1!='\0';i++)
  	{
  		if((s1<='z'))
  			s1-32;
  	}
  	printf("Resultant string is...%s",s1);
  	getch();
  }
  
  
  

• 088. Write a program to convert givern string to lower case in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i;
  	char *s1;
  	clrscr();
  	printf("Enter the string 1....");
  	scanf("%s",s1);
  
  	for(i=0;s1!='\0';i++)
  	{
  		if((s1<='Z'))
  			s1+32;
  	}
  
  	printf("Resultant string is...%s",s1);
  	getch();
  }
  
  
  

• 089. Write a program to concatinate two strings in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,len=0,j;
  	char *s1,*s2;
  	clrscr();
  	printf("Enter the string 1....");
  	scanf("%s",s1);
  	printf("Enter the string 2....");
  	scanf("%s",s2);
  
  	for(i=0;s1!='\0';i++)
  	{
           len++;
  	}
  	j=0;
  	for(i=len;s2!='\0';i++)
  	{
  		s1;
  		j++;
  	}
  	s1='\0';
  
  	printf("Resultant string is...%s",s1);
  	getch();
  }
  
  
  

• 090. Write a program to count no, of alphlabets, digits, special symbols in C language

  
  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,alphabets=0,digits=0,symbols=0;
  	char *s;
  	clrscr();
  	printf("Enter the string 1....");
  	scanf("%s",s);
  
  	for(i=0;s!='\0';i++)
  	{
  		 if(((s<='z')))
  				alphabets++;
  		 else if((s<='9'))
  				digits++;
  		 else
  				symbols++;
  	}
  	printf("\nAlphabets : %d",alphabets);
  	printf("\nDigits    : %d",digits);
  	printf("\nSymbols   : %d",symbols);
  	getch();
  }
  
  

• 091. Write a program to compare two strings in C language

  #include<stdio.h>
  #include<conio.h>  
  #include<process.h>
  main()
  {
  	int i;
  	char *s1,*s2;
  	clrscr();
  	printf("Enter the string 1....");
  	scanf("%s",s1);
  	printf("Enter the string 2....");
  	scanf("%s",s2);
  
  	for(i=0;s1!='\0';i++)
  	{
  		 if(s1)
  			{
  				if(s1)
  					printf("\nString 1 is greater...");
  				else
  					printf("\nString 2 is greater...");
  				getch();
  				exit(0);
  			}
  	}
  	printf("String are equal....");
  	getch();
  }
  
  
  

• 092. Write a program to count all vowels present in the string in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,vowel=0;
  	char *s;
  	clrscr();
  	printf("Enter the string 1....");
  	scanf("%s",s);
  
  	for(i=0;s!='\0';i++)
  	{
  		if((s=='I')||
  		  (s=='i'))
  						vowel++;
  	}
  	printf("\nVowels : %d",vowel);
  	getch();
  }
  
  
  
  

• 093. Write a program to reverse the given string in C language

  #include<stdio.h>
  #include<conio.h>  
  main()
  {
  	int i,j,len=0;
  	char *s1,*s2;
  	clrscr();
  	printf("Enter the string ....");
  	scanf("%s",s1);
  	for(i=0;s1!='\0';i++)
  		len++;
  	j=0;
  	for(i=len-1;i>=0;i--)
  	{
  		s2;
  		j++;
  	}
  	s2='\0';
  	printf("\nReversed String : %s",s2);
  	getch();
  }
  
  
  

• 094. Write a program to check if the given string is palindrome or not

  E.g. NITIN, LIRIL, MALAYALAM.

  #include<stdio.h>
  #include<conio.h>  
  #include<process.h>
  main()
  {
  	int i,j,len=0;
  	char *s1,*s2;
  	clrscr();
  	printf("Enter the string ....");
  	scanf("%s",s1);
  	for(i=0;s1!='\0';i++)
  		len++;
  	j=0;
  	for(i=len-1;i>=0;i--)
  	{
  		s2;
  		j++;
  	}
  	s2='\0';
  	for(i=0;s1!='\0';i++)
  		if(s1)
  		{
  			printf("\nNot a palindrome");
  			getch();
  			exit(0);
  	}
  	printf("Palindrome");
  	getch();
  }
  
  
  

• 095. Define a structure Employee having elements emp_id, name,etc. Accept data and reprint it

  #include<stdio.h>
  #include<conio.h>  
  
  struct Employee
  {
   char name;
   int emp_id;
   long phone_no;
  };
  
  main()
  {
  	struct Employee e;
  	clrscr();
  	printf("Enter name : ");
  	scanf("%s",&e.name);
  	printf("Enter emp_id: ");
  	scanf("%d",&e.emp_id);
  	printf("Enter Phone Number: ");
  	scanf("%ld",&e.phone_no);
  
  	printf("\n\nEnter name : %s",e.name);
  	printf("\n\nEnter Emp Id       : %d",e.emp_id);
  	printf("\n\nEnter Phone Number : %ld ",e.phone_no);
  
  	getch();
  }
  
  
  

• 096. Define a structure Student having fields roll_no, name, marks, etc, for 5 students, accept data and reprint

  
  #include<stdio.h>
  #include<conio.h>  
  
  struct Student
  {
   char name;
   int roll_no;
   int m1,m2,m3;
  };
  
  main()
  {   int i;
  	struct Student s;
  	clrscr();
  	for(i=0;i<5;i++)
  	{   printf("\nEnter data for Student %d.....\n",i+1);
  		printf("Enter name           : ");
  		scanf("%s",&s.name);
  		printf("Enter Roll No.       : ");
  		scanf("%d",&s.roll_no);
  		printf("Enter marks for sub1 : ");
  		scanf("%d",&s.m1);
  		printf("Enter marks for sub2 : ");
  		scanf("%d",&s.m2);
  		printf("Enter marks for sub3 : ");
  		scanf("%d",&s.m3);
  	}
  
  	for(i=0;i<5;i++)
  	{   printf("\nStudent   %d\n",i+1);
  		printf("Name    : %s\n",s.name);
  		printf("Roll No.: %d\n",s.roll_no);
  		printf("Sub1    : %d\n",s.m1);
  		printf("Sub2    : %d\n",s.m2);
  		printf("Sub3    : %d\n",s.m3);
  	}
  
  	getch();
  }
  
  
  

• 097. Define a structure Employee having elements emp_id, name, DOB, DOJ etc. Accept data and reprint it. (use structure within structure)

  #include<stdio.h>
  #include<conio.h>  
  
  struct Date
  {
  	int mm,dd,yy;
  };
  
  struct Employee
  {
  char name;
   int emp_id;
   struct Date DOB,DOJ;
  };
  
  main()
  {   int i;
  	struct Employee e;
  	clrscr();
  		printf("\nEnter name           : ");
  		scanf("%s",&e.name);
  		printf("\nEnter emp_id.        : ");
  		scanf("%d",&e.emp_id);
  		printf("\nEnter Date of Joining\n ");
  		printf("(dd-mm-yy) : ");
  		scanf("%d-%d-%d", &e.DOJ.dd,&e.DOJ.mm,&e.DOJ.yy);
  		printf("\nEnter Date of birth\n ");
  		printf("(dd-mm-yy) : ");
  		scanf("%d-%d-%d", &e.DOB.dd,&e.DOB.mm,&e.DOB.yy);
  
  		printf("\nName           : %s",e.name);
  		printf("\nEmployee ID    : %d",e.emp_id);
  		printf("\nEnter DOJ      : %d-%d-%d", e.DOJ.dd,e.DOJ.mm,e.DOJ.yy);
  		printf("\nEnter DOB      : %d-%d-%d", e.DOB.dd,e.DOB.mm,e.DOB.yy);
  
  	getch();
  }
  
  
  

• 098. Write a program to read and write a file character by character.

  #include<stdio.h>
  int main()
  {
      FILE *fp;   /* file pointer*/
      char fName;
      char ch;
   
      printf("\nEnter file name to create :");
      scanf("%s",fName);
   
      fp = fopen(fName,"w");
      if(fp==NULL)
      {
          printf("File not created !!");
          exit(0); 
      }
   
      printf("File created successfully.");
      /*writing into file*/
      printf("\nEnter text to write (press < enter > to save & quit):\n");
      while( (ch = getchar())!='\n')
      {
          putc(ch, fp); /*write character into file*/
      }
  
  /*again open file to read data*/
      fp = fopen(fName,"r");
      if(fp==NULL)
      {
          printf("\nCan't open the file!!!");
          exit(0);
      }
   
      printf("\nContents of file is :\n");
      /*read text until, end of file is not detected*/
      while( (ch=getc(fp))!=EOF )
      {
          printf("%c",ch); /*print character on screen*/
      }
   
      fclose(fp);
      return 0;
  }
  

• 099. Write a program to read and write a file line by line.

  #include<stdio.h>
  int main()
  {
      FILE *fp;
      char str;
      fp = fopen("C:\\myfile.txt", "w");
  
      if (fp == NULL)
      {
         puts("An error occurred while opening the specified file");
      }
  
       printf("Enter your string:");
  
       gets(str);
  
       fputs(str, fp);
  
       fclose(fp);
  
      fp = fopen("C:\\myfile.txt", "r");
  
      if (fp == NULL)
      {
         puts("An error occurred while opening the specified file");
      }
  
      while(1)
      {
         if(fgets(str, 10, fp) ==NULL)
              break;
         else
              printf("%s", str);
      }
  
      fclose(fp);
      return 0;
  }
  

• 100. Merge two files by store data into third one

  #include<stdio.h>
  #include<stdlib.h>
  
  int main()
  {
     FILE *fp1 = fopen("file1.txt", "r");
  
     FILE *fp2 = fopen("file2.txt", "r");
  
     FILE *fp3 = fopen("file3.txt", "w");
  
     char c;
     if (fp1 == NULL || fp2 == NULL || fp3 == NULL)
     {
           puts("Could not open files");
           exit(0);
     }
  
     while ((c = fgetc(fp1)) != EOF)
        fputc(c, fp3);
  
     while ((c = fgetc(fp2)) != EOF)
        fputc(c, fp3);
  
     fclose(fp1);
     fclose(fp2);
     fclose(fp3);
     return 0;
  }
  

• 101. Write a program accept a file name from user and print content of that file

  #include<stdio.h>
  int main(int argc, char *argv)
  {
      if ( argc != 2 ){
           printf( "usage: %s filename", argv );
      }
      else 
      {
          FILE *file = fopen( argv, "r" );
  
          if(file == NULL)
               printf("Could not open file\n");
          else 
          {
              int x;
              while((x=fgetc(file)) != EOF)
                   printf( "%c", x );
              fclose( file );
          }
      }
  }