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Thread: Declaring floating point number depending on an if statement

  1. #1
    Junior Member Keys767's Avatar
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    Default Declaring floating point number depending on an if statement

    Hello,
    I'm trying some basic Java exercises, but I'm stuck on one of them.

    My code is:

    import javax.swing.JOptionPane;
    public class PrintingDiscount
     
    {
    	public static void main(String[] args)
     
    	{
    		String numberOfFlyersInput = JOptionPane.showInputDialog("How many flyers?");
    		String numberOfPostersInput = JOptionPane.showInputDialog("How many posters?");
     
    		int numberOfFlyers = Integer.parseInt(numberOfFlyersInput);
    		int numberOfPosters = Integer.parseInt(numberOfPostersInput);
     
    		double flyerTotal = 0;
    		double posterTotal = 0;
    		double grandTotal = 0;
    		double costOfPoster = 2.00;
     
    /*
    				if (numberOfFlyers >= 500)
    					{
    						double costOfFlyer = 0.005;
    					}
    				else
    					{
    						double costOfFlyer = 0.01;
    					}
    */
     
    		flyerTotal = (costOfFlyer * numberOfFlyers);
    		posterTotal = (costOfPoster * numberOfPosters);
     
    		grandTotal = (flyerTotal + posterTotal);
     
    		JOptionPane.showMessageDialog(null, "Your flyers will cost " + flyerTotal + "\nYour posters will cost " + posterTotal + "\nIn total, this will cost " + grandTotal);
        }
    }

    The part commented out is my problem. I basically want to declare costOfFlyer as 0.01, unless the number entered by the user (numberOfFlyers) is 500 or more, in which case I want it to be 0.005.

    So, I've roughly coded what I thought might achieve this, but it is obviously incorrect since the compiler now cant find the variable costOfFlyer.

    Any tips would be appreciated. Thanks


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Declaring floating point number depending on an if statement

    You have defined that variable inside of a pair of {}s. The {}s define the scope or definitional visibility of the variable. The variable is not defined outside of the {}s.
    You need to move the definition of the variable to the same level of enclosing {}s that you want other code to be able to see it.
    You should put its definition with the other doubles you are defining.

  3. The Following 2 Users Say Thank You to Norm For This Useful Post:

    Keys767 (August 11th, 2011), Sean4u (August 10th, 2011)

  4. #3
    Junior Member Keys767's Avatar
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    Default Re: Declaring floating point number depending on an if statement

    Moved some stuff around and got it to work (shouldn't have been using 'double' inside the if statement ). Thanks for the push in the right direction.

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