qfedu-basic-level/day7/homework/h12.cpp

// 输入一个数，如果它是质数，输出 "Yes"，否则输出 "No"。
#include <iostream>

using namespace std;

int main()
{
    int n;
    cout << "请输入一个整数: ";
    cin >> n;

    int i = 2;
    while (i * i <= n)
    {
        if (n % i == 0)
        {
            cout << "No" << endl;
            return 0;
        }
        else
            i++;
    }

    cout << "Yes" << endl;

    return 0;
}