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Thread: Conversion Program

  1. #1
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    Default Conversion Program

    So for my CIS class, I need to write a program that converts inputed meters into either kilometers, inches, or feet based off of a menu provided to the user and their input. the meters entered cannot be negative, and if the menu option is outside of the 1-4 option range, it should be invalid. I am getting errors for :

    java: method showKilometers in class challenge8 cannot be applied to given types;
    required: double
    found: no arguments
    reason: actual and formal argument lists differ in length

    java: method showInches in class challenge8 cannot be applied to given types;
    required: double
    found: no arguments
    reason: actual and formal argument lists differ in length

    java: method showFeet in class challenge8 cannot be applied to given types;
    required: double
    found: no arguments
    reason: actual and formal argument lists differ in length

    Thank you in advanced for any help.

    here is my code:


    import javax.swing.JOptionPane;
     
    public class challenge8
    {
        public static void main(String[] args)
        {
        double meters;
        double kilometers;
        double inches;
        double feet;
        int menuItem;
     
        meters = getMeters();
        menuItem = menu();
        kilometers = showKilometers();
        inches = showInches();
        feet = showFeet();
     
            while (menuItem < 0 || menuItem > 4)
            {
                JOptionPane.showMessageDialog(null,"That is an invalid menu option.");
                menu();
            }
     
            if (menuItem == 1)
            {
                JOptionPane.showMessageDialog(null, meters + " meters is " + kilometers + " kilometers.");
            }
            else if (menuItem == 2)
            {
                JOptionPane.showMessageDialog(null, meters + " meters is " + inches + " inches.");
            }
            else if (menuItem == 3)
            {
                JOptionPane.showMessageDialog(null, meters + " meters is " +  feet + " feet.");
            }
            else if (menuItem == 4)
            {
                    System.exit(0);
     
            }
          System.exit(0);
        }
     
        public static double getMeters()
        {
           String input;
           double numMeters;
     
           input = JOptionPane.showInputDialog("Please enter a distance in meters.");
           numMeters = Double.parseDouble(input);
     
            if (numMeters < 0){
                JOptionPane.showMessageDialog(null, "Meter can not be negative.");
            }
     
            return numMeters;
     
        }
     
        public static double showKilometers(double numMeters)
        {
         return numMeters * 0.001;
        }
     
        public static double showInches(double numMeters)
        {
         return numMeters * 39.37;
        }
     
        public static double showFeet(double numMeters)
        {
          return numMeters * 3.281;
        }
     
        public static int menu()
        {
     
            String input;
            int choice;
     
            input = JOptionPane.showInputDialog("Please choose one of the following:\n 1. Convert to kilometers\n" +
                                                 " 2. Convert to inches\n 3. Convert to feet\n 4. Quit the program");
            choice = Integer.parseInt(input);
     
            return choice;
     
     
        }
    }


    --- Update ---

    I fixed the method error, I just had to pass meters into the methods.

    howver now my loop is messed up. It will work if on the first try, the option entered is 1-4, but if it is outside that range, the second time, no matter what the number is, it still says it is invalid.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Conversion Program

    One possible problem I see is the code does not use the value returned by the menu() method.
    If you don't understand my answer, don't ignore it, ask a question.

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

    DreamGod420 (October 17th, 2013)

  4. #3
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    Default Re: Conversion Program

    After a bit of toying with it and referring back to my Java textbook. I was able to make it work. Thank you for help though.

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