用Java打印循环的结果

这个代码不起作用。我（在eclipse中）遇到了以下无法解决的错误：

语法错误，插入“：：IdentifierRornew”以完成引用表达式
语法错误，插入“；”以完成BlockStatements
重复局部变量利息

---

变量

interest

声明两次

下面是您的代码的一个稍微清理过的版本：

import java.util.Scanner;

public class DoWhile {
    public static void main (String[] args)
    {
        Scanner in = new Scanner(System.in);
        System.out.print("balance: ");
        int balance = in.nextInt();
        System.out.print("interestRate: ");
        double interestRate = in.nextDouble();
        System.out.print("year: ");
        int year = in.nextInt();

        System.out.print("press 'N' to exit");
        String input = in.next();
        double interest = 0;    //to define interest

        do
        {
            interest = balance * interestRate / 100;
            balance += interest;
            year++; // print current balance
        }
        while (input.equals("N"));

        System.out.println("interest: " + interest + "balance: " + balance + "year: " + year) ;
    }
}

---

如果您修复了缩进，则更容易看到问题。

interest

必须定义为

Double

：

Double interest=null；do{interest=balance*interestRate/100；

True，修复了缩进。

import java.util.Scanner;

public class DoWhile {
    public static void main (String[] args)
    {
        Scanner in = new Scanner(System.in);
        System.out.print("balance: ");
        int balance = in.nextInt();
        System.out.print("interestRate: ");
        double interestRate = in.nextDouble();
        System.out.print("year: ");
        int year = in.nextInt();

        System.out.print("press 'N' to exit");
        String input = in.next();
        double interest = 0;    //to define interest

        do
        {
            interest = balance * interestRate / 100;
            balance += interest;
            year++; // print current balance
        }
        while (input.equals("N"));

        System.out.println("interest: " + interest + "balance: " + balance + "year: " + year) ;
    }
}