Functions – Theory and Programs [Learn to code]

What are Functions? Learn syntax for Functions, types of Functions and programs on Functions.

• 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();
  }