Question

我正在学习java atm，并且必须编写代码来计算货币单位，并且仅使用单个单位的单数词和多个单位的复数词来显示非零面额。

这是到目前为止的代码：

import java.util.Scanner;

public class ComputeChange {
    public static void main(String[] args) {

        Scanner input = new Scanner(System. in );
        // receive amount
        System.out.println("Enter an amount in double, for example 11.56: ");

        double amount = input.nextDouble();

        int remainingAmount = (int)(amount * 100);

        // find the number of one dollars
        int numberOfDollars = remainingAmount / 100;
        remainingAmount = remainingAmount % 100;

        // find the number of quarters in the remaing amount
        int numberOfQuarters = remainingAmount / 25;
        remainingAmount = remainingAmount % 25;

        //find the number of dimes in the remaing amount
        int numberOfDimes = remainingAmount / 10;
        remainingAmount = remainingAmount % 10;

        //find the number of nickels in the remaing amount 
        int numberOfNickles = remainingAmount / 5;
        remainingAmount = remainingAmount % 5;

        //find the number of pennies in the remaining amount
        int numberOfPennies = remainingAmount;

        //Display results
        System.out.println("Your amount" + amount + "consists of");

        if (numberOfDollars > 1) {
            System.out.println(" " + numberOfDollars + "dollars");
        } else if (numberOfDollars == 1); {
            System.out.println(" " + numberOfDollars + "dollar");
        }

输出是：运行：

Enter an amount in double, for example 11.56: 
12,33
Your amount12.33consists of
 12dollars
 12dollar
 1quarters
 1quarter
 0dimes
 0dime
 1nickles
 1nickle
 3pennies
 3penny

为什么一切都打印出来？ 3 ==不是1为什么它仍然说3便士？ Noob问题可能，但那是因为我是一个:)感谢您的帮助！

Answer 1

因为您在第二个;之后添加了随机if。因此，您的第二个System.out.println不是if语句的一部分。删除它：

if (numberOfDollars > 1) {
    System.out.println (" " + numberOfDollars + "dollars");
} else if (numberOfDollars == 1) {
    System.out.println (" " + numberOfDollars + "dollar");
}

Answer 2

在if();

之后删除分号

if (numberOfDollars == 1);

第二个打印声明正在打印，因为if();

之后您有分号，因此它不属于if()的一部分

Answer 3

替换

 else if (numberOfDollars == 1); { // with ;, condition terminates here itself

与

 else if (numberOfDollars == 1) {

在Statememnt结束时使用分号，以单行结束语句。意味着它忽略条件的结果并从下一行继续执行。

为什么要打印两次？如果别的

3 个答案: