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Thread: Performing Division with Double Variables

  1. #1
    Join Date
    Jun 2011
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    Default Performing Division with Double Variables

    I'm having a problem getting a proper output for a division function. I have defined the variable as double, but the output comes out rounded to the decimal place X.0.
    Ex: 10/3 comes out as 3.0

    What do I need to change in order to make double give me a full decimal output?

    Here is the source code for the division method:
    public void Divide() {
        CalcInput user = new CalcInput();
        String userInput = user.getUserInput(" ");
        int input1 = Integer.parseInt(userInput);
        System.out.println(" " + input1 + "/");
        String userInput2 = user.getUserInput(" ");
        int input2 = Integer.parseInt(userInput2);
        System.out.println("Input was " + input1 + "/" + input2);
        double output = input1/input2;
        System.out.println(" " + output);
    Last edited by bgroenks96; June 5th, 2011 at 01:24 PM. Reason: bolding did not work inside code tags

  2. #2
    Super Moderator Norm's Avatar
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    May 2010
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    Default Re: Performing Division with Double Variables

    You are doing integer division. 10/3 = 3
    There is no fractional part.

    If you want a fractional part, cast the numerator to double: ((double)input1)/input2

  3. #3
    Forum old-timer
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    Faversham, Kent, UK
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    Default Re: Performing Division with Double Variables

    Java requires at least one of the operands to be floating-point in order to return a floating-point result (see Java Language Spec 4.2.4: Floating Point Ops).

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