#include <stdio.h>

int factorial(int n)
{
        if(n == 0){return 1;}
        else { return n*(factorial(n-1));}
}

int main()
{
        int x = 0;
        char answer = 'Y';

        while(answer == 'Y')
        {
                printf("input a number to see its factorial : ");
                scanf("%d", &x);
                int output = factorial(x);
                printf("%d\n", output);

                printf("Would you like to continue Y/N : ");
                scanf("%c", &answer);
                printf("\n")
        }

        return 1;
}