C++ while 循环不是运行

Question

我的 while 循环不会运行在我设置的条件下。

该程序的目的是使用存款金额、利率和目标金额来确定存款金额到期所需的年数。

程序在输入目标金额后停止，除非我将 while 语句从 <= 更改为 >=，在这种情况下，它运行是循环，但 returns年份设置为 100 或 1000 等...

#include <iostream>
#include <iomanip>
#include <string>
#include <math.h>

using namespace std;

int main()
{
    //declare the variables
    double rate,
           balance = 0;
    int deposit,
        target,
        years = 0;
    cout << "****Lets make you some money!****" << endl << endl;
    //input from the user
    cout << "What is your deposit amount?: " << endl;
    cin >> deposit;
    cout << "What is your interest rate?: " << endl;
    cin >> rate;
    cout << "What is you target savings amount?: " << endl;
    cin >> target;
    rate = rate / 100;
    while (balance <= target); //when i change this to balance >= target the 'while' runs but just returns years divisible by 100
    {
        // calculation
        balance += deposit * pow((1 + rate), years);
        //balance = balance*(1 + rate) + deposit;   // alternate calculation
        //years++; 
        //users savings target
        cout << "You will reach your target savings amount in: " << balance << " years." << endl << endl << " That's not that long now is it?" << endl;
    }
    return 0;
}

提前致谢！

Answer 1

问题是一个不幸的后缀：

while (balance <= target);
//                       ^

相当于：

while (balance <= target) {
    ;
}
{
    // calculation, which always runs exactly once
    // regardless of what balance/target are
}

去掉分号即可。

C++ while 循环不是运行

C++ while loop not running

c++

while-loop

C++ while 循环不是 运行

C++ while loop not running

c++

while-loop

C++ while 循环不是运行