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Thread: Need Help with code ...beginner

  1. #1
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    Default Need Help with code ...beginner

    Hello, I have tried everything and my code won't do what it needs to can someone explain this to me D:!?

    Write a Java program that computes the area of a scalene triangle. Use the input dialog box to get the sides a, b, and c of the scalene triangle and compute the area using the following equation;
    Area = (s (s a) (s - b) (s c) )1/2 where s=(a+b+c)/2
    Your program must check that none of the length of the sides (a,b,c) is <= 0 and s > a and s > b and s > c. The output must be displayed in the message dialog box. (hint: you may use math class methods if needed).

    and heres what I have....


    import javax.swing.JOptionPane;

    public class Assignment3
    {
    public static void main(String[] args)
    {
    double sideA;
    double sideB;
    double sideC;
    double s;
    double Area;
    String input;

    input =
    JOptionPane.showInputDialog("Enter side A"); //input box for side A
    sideA = Double.parseDouble (input);

    input =
    JOptionPane.showInputDialog("Enter side B"); //input box for side B
    sideB = Double.parseDouble (input);

    input =
    JOptionPane.showInputDialog("Enter side C"); //input box for side C
    sideC = Double.parseDouble (input);


    s = (sideA + sideB + sideC) / 2; //finds what s is = to

    JOptionPane.showMessageDialog (null, "s is equal to " + s);



    Area = Math.pow (s*(s - sideA)*(s - sideB)*(s - sideC),1/2); //finds the area


    JOptionPane.showMessageDialog (null,"Area is equal to " + Area);

    //checks to see the each side is less then or equal to 0

    if (sideA <= 0)

    JOptionPane.showMessageDialog (null, " A is less then 0");

    if (sideB <= 0)

    JOptionPane.showMessageDialog (null, " B is less then 0");

    if (sideC <= 0)

    JOptionPane.showMessageDialog (null, "C is less then 0");


    System.exit(0);
    }
    }


  2. #2
    Member snowguy13's Avatar
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    Default Re: Need Help with code ...beginner

    Are you getting errors (post them!), or do you not know how to continue? Please be specific in the description of your problem.
    Use highlight tags to help others help you!

    [highlight=Java]Your prettily formatted code goes here[/highlight]

    Using these tags makes your code formatted, and helps everyone answer your questions more easily!




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  3. #3
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    Default Re: Need Help with code ...beginner

    I think I got it right...we'll see when i get my grade back XD


    import javax.swing.JOptionPane;

    public class Assignment3
    {
    public static void main(String[] args)
    {
    double sideA;
    double sideB;
    double sideC;
    double s;
    double Area;
    String input;


    input =
    JOptionPane.showInputDialog("Enter side A"); //input box for side A
    sideA = Double.parseDouble (input);

    input =
    JOptionPane.showInputDialog("Enter side B"); //input box for side B
    sideB = Double.parseDouble (input);

    input =
    JOptionPane.showInputDialog("Enter side C"); //input box for side C
    sideC = Double.parseDouble (input);

    //calculates s
    s = (sideA + sideB + sideC) / 2; //finds what s is = to

    JOptionPane.showMessageDialog (null, "s is equal to " + s);

    //checks to see that each side is less then s
    if (s > sideA && s > sideB && s > sideC)
    {
    JOptionPane.showMessageDialog (null, " All sides are less then s");
    }
    else
    {
    JOptionPane.showMessageDialog (null, " All sides are not less then s");
    }


    //calculates area
    Area = Math.sqrt (s*(s - sideA)*(s - sideB)*(s - sideC)); //finds the area


    JOptionPane.showMessageDialog (null,"Area is equal to " + Area);

    //checks to see that each side is less then or equal to 0
    if (sideA <= 0 && sideB <= 0 && sideC <= 0)
    {
    JOptionPane.showMessageDialog (null, " All sides are less then 0");
    }
    else
    {
    JOptionPane.showMessageDialog (null, " All sides are not less then 0");
    }



    System.exit(0);
    }
    }

  4. #4
    Member snowguy13's Avatar
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    Default Re: Need Help with code ...beginner

    Don't you want to check if ANY of the sides are less than zero BEFORE you calculate the area?
    Use highlight tags to help others help you!

    [highlight=Java]Your prettily formatted code goes here[/highlight]

    Using these tags makes your code formatted, and helps everyone answer your questions more easily!




    Wanna hear something funny?

    Me too.

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