Question

我有一个简单的程序，但它运行得很奇怪。基本上代码运行正常但是当行开头的编号发挥作用时，int x ++显示与第一行相同的数字然后继续。为什么会这样？

代码：

#include "stdafx.h"
#include <iostream>
#include <windows.h>
#include <string>
#include "logo.h"

int main()
{
    SetConsoleTitle("plains.exe");

    displayLogo();

    int number;
    int addTotal = 0;
    int numbersEntered = 0;

    std::cout << " [1] enter your first number: ";
    std::cin >> number;

    while (number != -1) {
        addTotal = addTotal + number;
        numbersEntered++;

        std::cout << " [" << numbersEntered << "]" << " enter your next number or type '-1' to add them: ";
        std::cin >> number;
    }

    if (number == -1) {
        std::cout << " " << std::endl;
        std::cout << " --------------------------------" << std::endl;
        std::cout << " " << std::endl;
        std::cout << " the sum of your numbers is " << addTotal << "." << std::endl;
        std::cout << " you entered a total of " << numbersEntered << " numbers." << std::endl;
        std::cout << " " << std::endl;
        std::cout << " the average of your numbers is " << addTotal / numbersEntered << "." << std::endl;
        std::cout << " " << std::endl;
    }

    return 0;
}

Answer 1

您已将<property> <name>fs.hdfs.impl.disable.cache</name> <value>true</value> </property>初始化为numbersEntered。第一次通过0循环时，while会将其设置为numbersEntered++。因此循环中的第一个提示包含1。这与您在循环之前打印的内容相同：

[1]

所以你看两次std::cout << " [1] enter your first number: ";。

要防止此重复，请在显示提示时将[1]添加到变量：

C ++ int x ++和int ++ x不工作我怎么想？

1 个答案: