factorial using recursive function

factorial recursive function

 

#include<stdio.h>

long long int fac(long long a)

{

 if(a==0)

 {

 return 1;

 }

 return a*fac(a-1);

}

int main()

{

  long long int a;

  while(scanf("%lld",&a)!=EOF)

{

    long long int n=fac(a);

    printf("factorial = %lld\n",n);

}

  return 0;

}