对百分比和利息计算有困难[副本]

Question

包括一个额外的用户投入,即每年增加额外捐款的百分比。例如，假设用户希望在第一年贡献$1000，每年增加2%。在第一年结束时，1000美元将增加到帐户中。在第二年年底，额外的金额增长2%，因此1020美元将增加到帐户。在第3年结束时，额外的金额又增长了2%，所以1040.40美元将被添加到帐户中，等等。我有麻烦与附上的代码，谁能帮助我吗？

import java.util.Scanner;

public class GettingRichSlowly {
    public static void main(String[] args) {
        Scanner scnr = new Scanner(System.in);

        // Get user input for initial deposit, annual interest rate,
        //  number of years, amount of yearly extra contribution
        System.out.println("Enter initial deposit: ");
        double initialDeposit = scnr.nextDouble();
        System.out.println("Enter annual interest rate (as a percentage): ");
        double interestRate = scnr.nextDouble();
        System.out.println("Enter number of years: ");
        int years = scnr.nextInt();
        System.out.println("How much extra would you like to contribute at the end of each year? ");
        double extraAmount = scnr.nextDouble();
        System.out.println("How much should the annual contribution increase each year (as a percentage)?");
        double annualIncrease = scnr.nextDouble();
        annualIncrease = annualIncrease / 100 + 1;

        // Amount in the account at the beginning of the current year
        double yearStart = initialDeposit;

        // Repeat years number of times
        int i = 1;
        while (i <= years) {
            // Dollar amount of interest earned during the current year
            double interest = yearStart * interestRate / 100;

            if (i == 1) {
            double yearEnd = yearStart + interest + extraAmount;
            }
            else {
                 extraAmount = extraAmount * annualIncrease;
                double yearEnd = yearStart + interest + extraAmount;
            }

            // Show the results for the current year
            System.out.format("%3d\t$%12.2f\t$%12.2f\t$%12.2f\t$%12.2f\n", i, yearStart, interest, extraAmount, yearEnd);

            // Update yearStart for the following year
            yearStart = yearEnd;

            i++;
        }
    }
}

编辑：当运行输入为100、7.5、10、1000、5的代码时，我会得到几条错误消息。GettingRichSlowly.java：44：找不到符号符号：变量yearEnd位置：类GettingRichSlowly System.Out.Format（“%3d\t$%12.2f\t$%12.2f\t$%12.2f\t$%12.2f\t$%12.2f\n”,i,yearStart,interest,extraAmount,yearEnd）；^GettingRichSlowly.java:47:找不到符号符号：变量yearEnd位置：类GettingRichSlowly yearStart=yearEnd；这些是什么意思？

Answer 1

你必须声明“双年结束”超过如果身体。

       double yearEnd;
        if (i == 1) {
            yearEnd = yearStart + interest + extraAmount;
        }
        else {
            extraAmount = extraAmount * annualIncrease;
            yearEnd = yearStart + interest + extraAmount;
        }

        // Show the results for the current year
        System.out.format("%3d\t$%12.2f\t$%12.2f\t$%12.2f\t$%12.2f\n", i, yearStart, interest, extraAmount, yearEnd);