My dollar calculator isn't working exactly as I want it to in java?

Question

import java.text.NumberFormat;
import java.text.DecimalFormat;
import java.util.Scanner;
public class Part2 {

    public static void main(String []args) {

         Scanner input = new Scanner(System.in);
         NumberFormat money = NumberFormat.getCurrencyInstance();
         DecimalFormat decimalformat = new DecimalFormat("##0; ##0");
         double a, b, answer;
         double nOnebills, nFivebills, nTenbills;
         double nTwentybills, nFiftybills, nOnehundredbills;
         double int nPenny, nNickle, nDime, nQuarter;

         System.out.println("Please input the amount the customer owns.");
         a = input.nextDouble();
         System.out.println("Please input the amount the customer paid.");
         b = input.nextDouble();

         answer = a - b;
         System.out.println("The amount of change given back to the customer "+ 
         money.format(answer));
         nOnehundredbills = (answer)/(100);

         if (nOnehundredbills <= 0) {
             System.out.println("The number of hundred dollar bills in your change is 0"); 
         } else {
             System.out.println("The number of hundred dollar bills in your change is "+ nOnehundredbills);
         }
    }
}

The output was this:

Please input the amount the customer owns.
100
Please input the amount the customer paid.
200
The amount of change given back to the customer ($100.00)
The number of hundred dollar bills in your change is 0

The 0 should be a 1 since 100 divided by 100 is 1 and 1 is not less than or equal to zero so it should have gone to the else statement.

You should double check this condition `if (nOnehundredbills <= 0) System.out.println("The number of hundred dollar bills in your change is 0"); else System.out.println("The number of hundred dollar bills in your change is "+nOnehundredbills);` **in your code answer = -100** — Shubhendu Pramanik, Sep 20 '17 at 16:59
why two types are declared double and int here"double int nPenny,nNickle,nDime,nQuarter"? does your code compile even? — Raju Sharma, Sep 20 '17 at 17:00
I think some of the confusion is that negative $100 is displayed as ($100) — Stefan, Sep 20 '17 at 17:03
what does the condition "if (nOnehundredbills <= 0)" means if nOnehundredbills is negative (-1) — Raju Sharma, Sep 20 '17 at 17:04
the money format made the -100 to $100 oh boy i see the mistake — mojojojo, Sep 20 '17 at 17:05

meditat · Answer 1 · 2017-12-24T18:31:00.967

1

you should write

 answer =b-a;//not a-b

Since you wrote a-b, the answer will have a value of -1, which will definitely enter the first if statement because -1<=0.

edited Dec 24 '17 at 18:31

answered Sep 20 '17 at 17:13

meditat

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My dollar calculator isn't working exactly as I want it to in java?

1 Answers1