C Program to Calculate Factorial Using Recursion

Factorial, in mathematics, the product of all positive integers less than or equal to a given positive integer and denoted by that integer and an exclamation point. Thus, factorial seven is written 7!, meaning 1 × 2 × 3 × 4 × 5 × 6 × 7. Factorial zero is defined as equal to 1.

//C program for factorial recursion

#include<stdio.h>
int facto(int);
int main()
{
   int n, f;
   printf("\nEnter any integer number:");
   scanf("%d",&n);		//taking input from user
    f=facto(n);			//calling the recursive function

   printf("\nfactorial of %d is: %d",n, f);		//output
   return 0;
}
int facto(int n) 		//recursive function facto
{
 
   if(n==0)
      return(1);
 
   return(n*facto(n-1));
}

Output