計算所需更改的金額

Question

我對Java很有興趣，我正在嘗試編寫一個程序，給出兩美元輸入的更改量。我無法弄清楚發生了什麼事。我試圖輸出貨幣時遇到了麻煩。例如，如果一個人欠了654.32美元並且支付了987美元，他們的變化應該是332.68美元，這將是2個季度，1個硬幣，1個鎳和3個小兔子。

任何幫助，非常感謝！

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){ 
       int cBal = (AmtPaid.compareTo(AmtDue)*100); 
       double dBal = AmtPaid.subtract(AmtDue).doubleValue(); 
       String eBal = n.format(dBal); 


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

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

        int dimes = (int) (cBal/10); 
        cBal = cBal % 10; 

        int nickles = (int) (cBal/5); 
        cBal = cBal % 5; 

        //pennies = (int) (dBal/100); 
        //dBal = dBal % 100; 

       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."); 
      } 


    } 

Answer 1

你快到了，你有點和cBal和dBal混淆了。並將變化轉換爲其.XX值。

正確的版本低於

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."); 
      } 

    } 
    } 

你一定要在Java命名和編碼約定閱讀起來。