1-100的阶乘

//输出100的阶乘  使用字符串存入阶乘的结果 然后每一位一次计算结果。
#include<iostream>
#include<string>
using namespace std;
int main()
{
	string a = "1";
	for (int i = 1; i < 100; i++)
	{
		int y = 0;
		for (int j = 0; j < a.length(); j++)
		{
			int x = (int)(a[j] - '0');
			x = x*i;
			x = x + y;
			y = x / 10;
			x = x % 10;
			a[j] = (char)(x + '0');
		}
		while (y)
		{
			a = a + (char)((y % 10)+'0');
			y = y / 10;
		}
		for (int k = a.length() - 1; k >= 0; k--)
		{
			cout << a[k];
		}
		cout << endl;
	}
	return 0;
}