N的阶乘

输入N求N的阶乘的准确值。

Input

输入N(1 <= N <= 10000)

Output

输出N的阶乘

Input示例

5

Output示例

120

#include <iostream>using namespace std;int main(){int n;cin >> n;int result[1000000];result[0] = 1;int len = 1;int c = 0;int j = 0;for (int i = 2; i <= n; i++){    c = 0;    for (j = 0; j < len; j++)    {        result[j] = result[j]*i + c;        c = result[j]/10;        result[j] = result[j]%10;    }        while (c)    {        result[j] = c%10;        c /= 10;        j++;    }    len = j;}for (int i = len-1; i >= 0; i--){    cout << result[i];}cout << endl;return 0;}