坚持并执行循环

Question

我正在写一个Java程序。它应该打印出年终账户余额、今年的投资、年度回报和年度数量。例：

第一年--投资10,000美元@ 10%

我的代码打印了六年，但值与第一年相同。那么循环有什么问题吗？非常感谢。这里我的代码：

import java.io.*;
import java.util.*;
import java.text.*;
public class ExamFive {
public static void main(String[] args) {
    final int MAX_INVESTMENT = 5000000;
    double goalAmount;
    double amountInvested;
    double annualRate;
    double interest;
    double total= 0;
    int year = 0;
    Scanner myScanner = new Scanner(System.in);
    System.out.println("Enter your investment goal amount: ");
    goalAmount = myScanner.nextDouble();
    if (goalAmount > MAX_INVESTMENT) {
        System.out.println("Your goal is outside the allowed 5,000,000 limit");
    }
    System.out.println("Enter the amount annually invested: ");
    amountInvested = myScanner.nextDouble();
    System.out.println("Enter the expected annual return rate (ex 6.50): ");
    annualRate = myScanner.nextDouble();

    do {
        interest = amountInvested * (annualRate / 100);
        total = amountInvested + interest;
        year++;
        System.out.println("Yearend account balance " + total + 
                " Invested this year " + amountInvested + " Annual  return " + interest
                + " number of years " + year);

    } while (total < MAX_INVESTMENT && year < 6);

    System.out.println(" ");
    System.out.println("Your investment goal " + goalAmount);
    System.out.println("Your annualinvestment amount " + amountInvested);
    System.out.println("Number of years to reach your goal " + year);
}

}

这是输出：

年终账户余额11000.0投资本年度10000.0年度收益1000.0年1年终账户余额11000.0今年投资年收益1000.0年2年终账户余额11000.0今年投资10000.0年回报1000.0年3年期末账户余额11000.0今年投资10000.0年回报1000.0年4年末账户余额11000.0今年投资10000.0年年回报1000.0年5年度账户余额11000.0今年投资10000.0年回报1000.0年6年数

Answer 1

看来你也只是在计算每年节省的利息。

更改：

do {
    interest = amountInvested * (annualRate / 100);
    total = amountInvested + interest;
    year++;
    ...
} while (total < MAX_INVESTMENT && year < 6);

至：

do {
    total += amountInvested;
    interest = total * annualRate / 100;
    total += interest;
    year++;
    ...
} while (total < MAX_INVESTMENT && year < 6);

Answer 2

你不能保持一个跑步的总数。

看起来可能是第三或第四周的教程，但这是一个公平的问题，至少你问了什么问题。

尝试：total += (amountInvested + interest);

括号是不需要的，但我通常会发现它们是一个很好的逻辑分组设备。

Answer 3

检查下面的循环，您没有像您所说的那样添加10,000

do {
    interest = amountInvested * (annualRate / 100);
    total = amountInvested + interest;
    year++;
    System.out.println("Yearend account balance " + total + 
            " Invested this year " + amountInvested + " Annual  return " + interest
            + " number of years " + year);

}

添加以下一行

amountInvested += (total + 10000);

作为do while循环的最后一行。