坚持做while循环

Question

我正在编写一个 Java 程序。它应该打印出年终账户余额，今年投资，年度回报和年度数量。前任：

第一年-投资10000美元，投资额为10%，最终投资额为11000美元第二年-在现有11000美元的基础上再投资10000美元，现在你有21000美元，年回报率为2100美元，最终投资额为23100美元，持续投资6年。

我的代码打印了所有6年，但与第一年的值相同。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);
}

}

以下是输出：

年末账户余额11000.0本年投资10000.0年回报1000.0年数1年末账户余额11000.0本年投资10000.0年数1000.0年数2年末账户余额11000.0本年投资10000.0年回报1000.0年数3年末账户余额11000.0本年投资10000.0年回报1000.0年数4年末账户余额11000.0本年投资10000.0年回报1000.0年数5年末账户余额11000.0本年投资10000.0年数1000.0年数6

Answer 1

看来你也只是在计算每年储蓄的利息。

更改：

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

致：

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