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Thread: String to Double Conversion

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    Default String to Double Conversion

    I'm sure this is something very simple, but after having spent about two hours I have run out of ideas. A very simple program creating a array and having a user input 10 numbers via a dialog box. Then taking those numbers and displaying them smallest to largest. It worked fine when I had the variables set as Integers, but know that I have changed everything to Double, I can't convert the user input from String to Double. I keep getting the error "Loss of precision" "Required int, found double" . All variables and the list are Double, but something is being read as an Integer somewhere, somehow. Any recommendations?


    double list [] = new double [10];

    for (double num = 0.0; num < list.length ; num++){
    String numStr = JOptionPane.showInputDialog("Enter a number");
    list [num] = Double.parseDouble(numStr);
    }

    Arrays.sort(list);
    for (double x = 0.0; x < list.length; x++){
    }

    final String numbersList = Arrays.toString( list );
    JOptionPane.showMessageDialog( null, "Your numbers are: " + numbersList );
    }
    }


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    Default Re: String to Double Conversion

    Please post your code in formatting tags. You can learn how in the Announcments at the top of the page.

    It's not clear why you'd be getting that error with the code you've posted. It's also not clear why you changed every int to a double, especially those used as for loop control variables which are then used as array indices. doubles cannot be used as array indices, so that IS a real error you should be getting.

  3. The Following User Says Thank You to GregBrannon For This Useful Post:

    suteki73 (September 21st, 2013)

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    Default Re: String to Double Conversion

    Thanks. I changed the for loop control variables back to Integers and it works now. Don't really understand why that caused the "list [num] = Double.parseDouble(numStr);" line to highlight as an error though, but the important thing is it works now. Thanks again.

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    Default Re: String to Double Conversion

    Quote Originally Posted by suteki73 View Post
    Thanks. I changed the for loop control variables back to Integers and it works now. Don't really understand why that caused the "list [num] = Double.parseDouble(numStr);" line to highlight as an error though
    Think about it this way:
    If the variable num is a double, then:
    num = 1.3;
    list[num]
    exactly what index is 1.3?
    That is why it must be an int and not a double

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