Question

我是Java的noob，我正在尝试编写一个程序，给出两美元输入的更改量。我无法弄清楚发生了什么。我特别难以输出造币。因此，例如，如果一个人欠654.32美元并支付987美元，他们的变化应该是332.68美元，这将是2个季度，1个角钱，1个镍币和3个钱币。

非常感谢任何帮助！

Answer 1

你几乎就在那里，你有点混淆了cBal和dBal。并将更改转换为.XX值。

正确的版本在

之下

import java.util.*;
import java.math.*;
import java.text.*;


public class CorrectChange {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);

        BigDecimal AmtDue;      
        BigDecimal AmtPaid;


        NumberFormat n = NumberFormat.getCurrencyInstance(Locale.US);

        //User enters the amount that the customer owes
        System.out.println("Enter the amount below that is due to be paid.");
        System.out.print("$");
            AmtDue = input.nextBigDecimal();

            //Converts user's input into the currency format
            AmtDue = AmtDue.setScale(2, BigDecimal.ROUND_HALF_UP);
                double dAmtDue = AmtDue.doubleValue();
                    String eAmtDue = n.format(dAmtDue);

        //User enters the amount that the customer paid     
        System.out.println("Enter the amount below that has been paid.");
        System.out.print("$");
            AmtPaid = input.nextBigDecimal();

            //Converts user's input into the currency format
            AmtPaid = AmtPaid.setScale(2, BigDecimal.ROUND_HALF_UP);
                double dAmtPaid = AmtPaid.doubleValue();
                    String eAmtPaid = n.format(dAmtPaid);

            //Checks to see if the amount paid is more than the amount owed
            if (AmtDue.compareTo(AmtPaid)> 0){
                double dBal = AmtDue.subtract(AmtPaid).doubleValue();
                String eBal = n.format(dBal);
                System.out.println("You still owe: " + eBal.toString());
            }

            //Checks to see if the amount owed is more than the amount paid
            if (AmtDue.compareTo(AmtPaid)< 0){
                double dBal = AmtPaid.subtract(AmtDue).doubleValue();
                String eBal = n.format(dBal);


                    int DolBills = (int) (dBal / 1);
                    dBal = dBal % 1.0;

                    int quarters = (int) (dBal / .25);
                    dBal = dBal % .25;

                    int dimes = (int) (dBal / .10);
                    dBal = dBal % .10;

                    int nickles = (int) (dBal / .05);
                    dBal = dBal % .05;

                    int numPennies = (int) (dBal / .01);
                    //dBal = dBal % 0.01;

                System.out.println("You owe a balance of " + eAmtDue.toString() + ". Since you paid the amount of " + eAmtPaid.toString() + " your change is " + eBal.toString());
                System.out.println("Your change amount is as follows:\n" +
                    "\t" + DolBills + " $1 dollar bills \n" +
                    "\t" + quarters + " quarters \n" +
                    "\t" + dimes + " dimes \n" +
                    "\t" + nickles + " nickels \n" +
                    "\t" + numPennies + " pennies");

            }

            //Checks to see if the amount paid is equal to the amount owed
            if (AmtDue.compareTo(AmtPaid)== 0){
                    System.out.println("Your balance has been paid. Thank you for your business.");
            }

    }
    }

你一定要阅读java命名和编码约定。

计算到期的变更金额

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