Question

请原谅我，如果这是一个简单的问题，我对编码非常陌生，但我一直在尝试创建一个程序，用户会想到一个数字而计算机会尝试使用随机数发生器上的参数。

#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;
}

偶尔会有一个数字会产生设定的参数，就像这样，而对于我的生活，我无法理解为什么。

试运行结果：

数字= 60

第一次猜测= 72，最大值设为72

第二次猜测= 39，最小值设为39

第三次猜测= 45，最小值设为45

第4次猜测= 99，超出范围，（45,72），并且不应该首先猜测。

有关为何发生这种情况的任何想法？

Answer 1

想想看，你选择60，计算机猜测30.所以你设置min = 30（正确），你希望你的范围是（30,100）。所以你应该设置：

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

更大猜测的相同计算

编辑：为了改进您的代码，我建议您学习do while，这可能会有所帮助：）

Answer 2

我意识到这并不完全是回答这个问题，但你真的不应该像你那样生成随机数。从C ++ 11开始，你应该使用MT生成器，它更容易使用和理解。

std::random_device rd;
std::mt19937 rng(rd());
std::uniform_int_distribution<int> uni(0, 100);

int foo = uni(rng);

随机数生成器不在set变量参数内生成

2 个答案: