输出结果小于50000的正整数的阶乘值

题目：编写程序，输出结果小于50000的正整数的阶乘值。想一想若用while(1){}构造循环，循环条件是什么？有什么方法可以结束循环？

for循环：

#include<iostream>
using namespace std;
int main()
{
cout << "Output the factorial of n(factorial is smaller than 50000):" << endl;
int fac = 1;
for (int i = 1;fac<=50000; i++)
{
fac *= i;
cout << "!" << i << "=" << fac << endl;
}
system("pause");
}

while循环：

#include<iostream>
using namespace std;
int main()
{
    cout << "Output the factorial of n(factorial is smaller than 50000):" << endl;
    int fac = 1, i = 1;
    while (1)
    {
        fac *= i;
        if (fac <= 50000)
        {
            cout << "!" << i << "=" << fac << endl;
        }
        else break;
        i++;
    }
    system("pause");
}