Re: Help with code...

From:
DBJohnston0104@gmail.com
Newsgroups:
comp.lang.java.programmer
Date:
Thu, 29 Nov 2007 16:53:32 -0800 (PST)
Message-ID:
<d22a78cf-79cc-4c81-9b67-0297bbbb2801@d21g2000prf.googlegroups.com>
On Nov 28, 10:04 pm, "Andrew Thompson" <u32984@uwe> wrote:

DBJohnston0...@gmail.com wrote:

I'm trying to complete a homework assignment ...


A good group for Java beginners is comp.lang.java.help

...And here is what I have so far:


That code was a pretty good description of your problem,
but the lines wrapped and had to be fixed before it would
compile and the error became clear to me.

To help avoid line-wrap in code, use the TWC
<http://www.physci.org/twc.jnlp>

Here is the fixed code, with comments. Note that this is an
SSCCE that spans only 68 characters width. Hopefully
it should not line-wrap.

<sscce>
import javax.swing.JOptionPane;

/* MonthlyBills.java - This program calculates the total
  of your monthly bills.
Input: Bill type and bill amount.
Output: Prints the total of your monthly bills. */
public class MonthlyBills
{
    public static void main(String args[])
    {
        /** Description of bill. */
        String billType;
        /** String version of bill amount. */
        String stringAmount;
        /** Amount of the bill. */
        double billAmount;
        /** Accumulates sum of bills. */
        double sum = 0;

        do
        {
            // This input statement asks the user to
            // enter a bill type or the word none.
            billType = JOptionPane.showInputDialog(
                "Enter bill type or the word done to quit.");

            // String comparison needs to be done using .equals()
            // to check equality of the contents, as opposed to
            // the String objects
            if(!billType.equals("done"))
            {
                // This input statement asks your user
                // to enter a bill amount.
                stringAmount = JOptionPane.showInputDialog(
                    "Enter amount of bill");

                // This statement converts the string version
                // of the amount to a double.
                billAmount = Double.parseDouble(stringAmount);

                //This totals up the amount of the bills
                sum += billAmount;
            }

        }while(!billType.equals("done"));

            // This statement displays the sum of monthly bills.
            System.out.println("Sum of monthly bills is $: " + sum);

            // This statement causes the program to exit.
            System.exit(0);

    } // End of main() method.

} // End of MonthlyBills class.

</sscce>

--
Andrew Thompsonhttp://www.physci.org/

Message posted via JavaKB.comhttp://www.javakb.com/Uwe/Forums.aspx/java-general/200711/1


Andrew, you're my hero! I have spent several nights looking at this
simple program and it was driving me nuts. I don't think that I can
turn in your answer but I do thank you for your help. In our book it
has example of all the operators and what they mean but not so much as
to how to use them. The ! in front of the billType I would have never
figured out. Thanks again!

So when you refer to a string you have to use .value() to check for
equality but not for double? Is that right?

Thanks again,
David

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