factorial

#include <stdio.h>

long long factorial(int n)
{
	long long result = 1LL;

	for (int i = 2; i <= n; ++i)
	{
		result = result * i;
	}

	return result;
}

int main(void)
{
	for (int i = 1; i <= 100; ++i)
	{
		long long result = factorial(i);
		printf("%d! : %lld\n", i, result);
	}

	return 0;
}

<compile 결과>