How do I make Java display a display a quotient and a remainder?

Question

I can only seem to get it to display the quotient and the decimal. For example if I divide 9 by 2, I will get 4.5. However, I would like to get it to be 4r 1. My current code is import java.util.Scanner;

public class Convert{   

 public static void main(String [] args){      
  Scanner reader = new Scanner(System.in);      

  double dividend;      
  double divisor;      
  double quotient;           

  System.out.print("Enter the dividend ");    
  dividend = reader.nextDouble();     

  System.out.print("Enter the divisor ");       
  divisor = reader.nextDouble();    

  quotient = dividend/divisor;          

  System.out.print("The quotient is ");    
  System.out.println(quotient);       
 } 
}

There isn't a remainder when you divide by a double. – Andy Turner Oct 19 '17 at 14:13 — Andy Turner, Oct 19 '17 at 14:13
You need to calculate it explicitly. – Thorbjørn Ravn Andersen Oct 19 '17 at 14:32 — Thorbjørn Ravn Andersen, Oct 19 '17 at 14:32
I appreciate the timely comeback ;-) – GhostCat Oct 23 '17 at 14:07 — GhostCat, Oct 23 '17 at 14:07

GhostCat · Accepted Answer · 2017-10-19T14:47:09.963

4

Simple: you are using the wrong types then.

It seems that you want to operate on whole numbers.

Then don't use floating point numbers, but types such as int or long.

Because different types imply different semantics for the corresponding operations, see here for example. Beyond that, you then want to look into the % or modulo operator (see there).

edited Oct 19 '17 at 14:47

answered Oct 19 '17 at 14:14

GhostCat

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the basic is enough :) – davidxxx Oct 19 '17 at 14:15
Dividing with whole-number types still won't return a remainder - just the rounded result of dividing with decimal types. – ack Oct 19 '17 at 14:24
@AlexQuilliam Correct, I could have been more precise about that. I enhanced my answer accordingly. – GhostCat Oct 19 '17 at 14:47

ack · Answer 2 · 2017-10-19T14:26:51.813

0

First off, don't use a decimal type like float or double, use a whole-number type like int or long. Second off, to get a reminder, you'll need to use the modulus operator (%). It works like so:

int i = 5 % 2; equals 1.

int i = 13 % 7; equals 6.

edited Oct 19 '17 at 14:26

answered Oct 19 '17 at 14:22

ack

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No point in using `short`: shorts are widened to (at least) `int` when you divide them. – Andy Turner Oct 19 '17 at 14:26
That's interesting. I didn't know that. – ack Oct 19 '17 at 14:27
[JLS](https://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-15.17.2): it's the "binary numeric promotion" bit. – Andy Turner Oct 19 '17 at 14:28

achAmháin · Answer 3 · 2017-10-19T14:27:46.757

You could change all values to an int

Then also get the remainder by using the modulus operator (%)

int dividend;
int divisor;
int quotient;
int remainder;
String remainderResult;

System.out.print("Enter the dividend ");
dividend = reader.nextInt();

System.out.print("Enter the divisor ");
divisor = reader.nextInt();

quotient = dividend / divisor;
remainder = dividend % divisor;

remainderResult = (remainder != 0) ? ", remainder " + remainder : "";

System.out.println("The quotient is " + quotient + remainderResult);

How do I make Java display a display a quotient and a remainder?

3 Answers3