這是筆試的第二題，求任意數的階乘其實實質也就是大數相乘，很可惜沒有在規定時間內完成這道題，估計這次筆試涼涼。

#include<iostream>
using namespace std;

int result[200] = { 0 };
int N;
void fun(int n) {
	int temp;
	int i;
	int carry=0;
	if (n == 1) {
		result[0] = 1;
		N = 1;
	}
	else {
		for (i = 0; i < N; i++) {
			temp = result[i] * n + carry;
 

			result[i] = temp % 10;
			carry = temp / 10;
		}
		while (carry) {
			result[i] = carry % 10;
			carry = carry / 10;
			i++;
			N++;
		}
	}
}

int main() {
	int n;
	int i;
	cin >> n;
	for (i = 0; i < n; i++)
		fun(i+1);
	for (i = N - 1; i >= 0; i--)
		printf("%d", result[i]);
	printf("\n");
	system
 
("pause");
	return 0;
}