#include <stdio.h>

int fact(int n);

int main()

{

int n;

printf("Enter a positive integer: ");

scanf("%d", &n);

printf("Factorial of %d = %ld", n, fact(n));

return 0;

}

long int fact(int n)

{

if (n >= 1)

return (n*fact(n-1));

else

return 1;

}