今天做一个简单的猜数字

猜数字代码：

#include <iostream>
#include <cstdlib>
#include <ctime>
#include <string>
using namespace std;

int main()
{
    int n, number, sum;
    bool flag = true;
    string str;
    srand((unsigned int)time(NULL));
    number = rand() % 20;
    cout << "准备好了吗，游戏要开始咯" << endl;
    cout << "回复“no”再准备一下，回复任意开始游戏..." << endl;
    cin >> str;
    if (str == "no" || str == "No" || str == "nO" || str == "NO")
    {
        cout << "小朋友再准备一下，欢迎下次再来玩哟~" << endl;
        exit(0);
    }
    cout << endl <<  "|游戏开始|" << endl << "你想有几次机会呢？" << endl;
    cin >> sum;
    cout << "请输入猴博士心中所想的数字(0 ~ 19)，你有" << sum << "次机会哦~：";
    while (sum)
    {
        cin >> n;
        if (number > n)
        {
            cout << "↑ 猜小啦 ↑" << endl;
        }
        else if (number < n)
        {
            cout << "↓ 猜大啦 ↓" << endl;
        }
        else
        {
            cout << "猜对啦~，小朋友真棒！" << endl;
            cout << endl << "恭喜你成功完成！( ?? ω ?? )y" << endl;
            flag = false;
            break;
        }
        sum--;
        if (sum) cout << endl << "继续猜猜看，接着输入猴博士想的那个数字：" << endl;
    }
    if (flag)
    {
        cout << endl << "小朋友机会用完了哦~，猴博士心中所想的数字是: " << number << endl;
        cout << "点击下方运行再尝试一次吧~"<< endl;
    }
    return 0;
}