Calculate factorial using recursive function.

#include <stdio.h>

long int fact(int);

int main(void)
{
int n;
long int f;

printf("\nEnter a number : ");
scanf("%d", &n);

f = fact(n);

printf("\nFactorial of %d is %ld", n, f);

return 0;
}

long int fact(int num)
{
long int res = 1;
if(num == 1)
return res;
res = num * fact(num - 1);
return res;
}