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Thread: New to java, help with printing double

  1. #1
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    Default New to java, help with printing double

    I have been messing around with java for a small while now,
    i can already code with C.

    Can anyone tell me however why the following wont print

    double fahrenheit = 500;
    double celsius = (fahrenheit - 32) * (5/9.0);
    System.out.println("The value is: %5.2f",celsius);

    But if i printed
    double fahrenheit = 500;
    double celsius = (fahrenheit - 32) * (5/9.0);
    System.out.println("The value is: "+celsius);

    it would just print what is stored in celsius.

    I understand that celsius is a a double so why wont it print when do it the first way

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: New to java, help with printing double

    why the following wont print
    Please copy the full text of the error message and paste it here so we can see the problem.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: New to java, help with printing double

    /*
    * This program demonstrates implicit and explicit data conversion
    */
    package dataconversion;

    /**
    *
    * @author Peggy Fisher
    */
    public class DataConversion {

    /**
    * @param args the command line arguments
    */
    public static void main(String[] args) {
    // System.out.println ((3+5+8)/3);
    // System.out.println ((3+5+8)/3.0);
    // double volume = 4/3 * Math.PI * 10 * 10 * 10;
    // double realVolume = 4/3.0 * Math.PI * 10 * 10 * 10;
    //System.out.println("The volume of a sphere with a radius of 10 is: "+volume);
    //System.out.println("The volume of a sphere with a radius of 10 is: "+realVolume);


    double fahrenheit = 500;
    double celsius = (fahrenheit - 32) * (5/9.0);
    System.out.println("The value is: %5.2f",celsius);

    }

    }

    run:
    Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - Erroneous sym type: java.io.PrintStream.println
    at dataconversion.DataConversion.main(DataConversion. java:26)
    C:\Users\Ollie\AppData\Local\NetBeans\Cache\8.2\ex ecutor-snippets\run.xml:53: Java returned: 1
    BUILD FAILED (total time: 0 seconds)

    --- Update ---

    i have just found out printf works
    what is the difference between printf and println

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: New to java, help with printing double

    what is the difference between printf and println
    Start by reading the API doc for those two methods. It will be explained there.
    http://docs.oracle.com/javase/8/docs/api/index.html

    If you have questions about what is explained there, copy the text that is in question and paste it here with your question.

    A quick and dirty explanation: f is print with formatting, ln is print a newline at end
    If you don't understand my answer, don't ignore it, ask a question.

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