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Thread: Need help with while loop

  1. #1
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    Default Need help with while loop

    Ok so I attatched the assignment the question I'm on is #2 and this is what I have down so far. It asks for a return type but I'm not sure what to return? Any advice would be greatly appreciated I've been working on this assignment for what seems like forever.
    public class cannonball
    {
        private double velocity;
        private double time;
        final double GRAVFORCE = 9.81;
        private double height;
        private double heightFormula;
        private double maxHeight;
     
        public cannonball(double Velocity)
        {
            velocity = Velocity;
            height = 0;
            heightFormula = 0;
        }
        public double simulateFlight()
        {
          time = 0;
            while(height>0||time<100)
            {
                heightFormula = (velocity*time)-0.5*GRAVFORCE*Math.pow(time,2);
                height = velocity*time;
                time++;
                velocity = velocity - GRAVFORCE*time;
                str = time + "\t\t"+ velocity +"\t\t" + height + "\t\t"+ heightFormula;
            }
     
        }
    }
    Attached Files Attached Files


  2. #2
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    Default Re: Need help with while loop

    It asks for a return type
    What is the "It" you are asking about? If you are getting an error from the compiler, please copy the full text of the error message and paste it here.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Need help with while loop

    it is an error which reads "missing return statement"

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    Default Re: Need help with while loop

    "missing return statement"
    That says that the compiler can not find a return statement in a method that is defined to return a value.
    Add a return statement at the end of the method where the error is that returns a value of the type shown in the methods definition.

    BTW that is not a full error message. Here is a sample compiler error message:
    The message should show the source with a ^ under the location of the error.
    Here is a sample from the javac compiler:
    TestSorts.java:138: cannot find symbol
    symbol  : variable var
    location: class TestSorts
             var = 2;
             ^
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Need help with while loop

    pic1.jpg
    this is a picture of the entire message

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    Default Re: Need help with while loop

    I want to return three things from the one method is that possible?

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    Default Re: Need help with while loop

    If you put them in a collection of some kind, yes. But you can't do:

    return this, that, andTheOtherThing;

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