Strings – Theory and Programs [Learn to code]

What is String? What are inbuild functions for processing string and different programs on Strings.

• 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();
  }