#define CRT_NO_WARNINGS
#include <stdio.h>
#include <assert.h>

long fact_rec(const long n)
{
    if (n < 2)
        return (long)1;
    else
        return n * fact_rec(n - 1);
}

long fact_iter(const long n)
{
    long res = 1;
    for (long i = 2; i <= n; i++)
        res *= i;
    return res;
}


main()
{
    for (long i = 1; i < 10; i++)
    {
        long res1, res2;
        res1 = fact_rec(i);
        res2 = fact_iter(i);
        assert(res1 == res2);
    }

    puts("All done\n\nEnd!");
    getchar();
}