c++ - 随机数生成器未在设置的变量参数内生成

Question

如果这是一个简单的问题，请原谅我，我对编码非常陌生，但我一直在尝试创建一个程序，在该程序中，用户想到一个数字，计算机尝试使用随机参数来猜测它数发生器。

#include <iostream>
#include <cstdlib>
#include <ctime>
#include <string>

using namespace std;

int main()
{
    srand(static_cast<unsigned int>(time(0))); //seed random number generator
    int guess = (rand() % 100) + 1; //random number between 1 and 100
    int turns = 1;
    int max = 100;
    int min = 1;

    cout << "Pick a number between 1 and 100 then press enter." << endl;
    cin.get();

    string responce = "n";
    cout << "Was " << guess << " your number? Y/N" << endl;
    cin >> responce;

    while (responce == "n" || responce == "N")
    {
        ++turns;

        string lowresponce;
        cout << "Was the number too low?" << endl;
        cin >> lowresponce;

        if (lowresponce == "y" || lowresponce == "Y")
        {
            min = guess; //this statement should (?) set the minimum number to whatever was guessed.
            guess = (rand() % max) + min; //then this should calculate a number between the minimum (which is the last number guessed) and the maximum
        }
        if (lowresponce == "n" || lowresponce == "N")
        {
            max = guess;
            guess = (rand() % max) + min;
        }

        cout << "Was " << guess << " your number? Y/N" << endl;
        cin >> responce;
    }

    cout << "I guessed your number, " << guess << ", in " << turns << " turns!" << endl;

    return 0;
}    

偶尔会生成超出设置参数的数字，像这样，对于我的一生，我无法理解为什么。

测试运行结果:

数量 = 60

第一次猜测 = 72，最大设置为 72

第二次猜测 = 39，最小设置为 39

第三次猜测 = 45，最小设置为 45

第四次猜测 = 99，超出范围 (45,72)，一开始就不应该是猜测。

关于为什么会发生这种情况有什么想法吗？

Answer 1

想一想，你选择了 60，计算机猜测 30。所以你设置 min = 30(正确)，并且你希望你的范围是 (30,100)。所以你应该设置:

guess = (rand() % (max - min)) + min;

相同的计算以获得更大的猜测

编辑:为了改进您的代码，我建议您学习do while，它可能会有所帮助:)