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Thread: What's the bug in this code?

  1. #1
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    Default What's the bug in this code?

    I'm sure it's something really simple that I'm missing, but after spending a long while going over it, I can't figure out what's wrong. It looks like it should work:

    public class HW {
     
     
     
                public static void main(String args[])
     
                 {
     
                            System.out.println("\nEx0811.JAVA\n");
     
                            double num1 = 200;
     
                            double num2 = 100;
     
                            Calc.add(num1,num2);
     
                            Calc.subtract(num1,num2);
     
                            System.out.println();
     
                }
     
     
     
    }
     
     
     
    class Calc
     
    {
     
                public static void add(double a, double b);                     
                	{   
                		System.out.println(a + b);
                		   }
     
     
     
                public static void subtract(double a, double b); 
                	{   
                		System.out.println(a - b);   
                			 }
     
    }



    It is supposed to display the sum and difference of num1 and num2. But instead, I get these 6 errors:


    #
    C:\HW.java:35: error: missing method body, or declare abstract
    public static void add(double a, double b);
    ^
    C:\HW.java:37: error: cannot find symbol
    System.out.println(a + b);
    ^
    symbol: variable a
    location: class Calc
    C:\HW.java:37: error: cannot find symbol
    System.out.println(a + b);
    ^
    symbol: variable b
    location: class Calc
    C:\HW.java:42: error: missing method body, or declare abstract
    public static void subtract(double a, double b);
    ^
    C:\HW.java:44: error: cannot find symbol
    System.out.println(a - b);
    ^
    symbol: variable a
    location: class Calc
    C:\HW.java:44: error: cannot find symbol
    System.out.println(a - b);
    ^
    symbol: variable b
    location: class Calc
    6 errors

    Process completed.



    Can someone explain what's wrong to me? Any help greatly appreciated.


  2. #2
    Java kindergarten chronoz13's Avatar
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    Default Re: What's the bug in this code?

    a semicolon is used to terminate a statement in the code, its like a comma or period when you are writing phrases or sentences in an essay, its like telling the compiler "ok i've had enough telling what i need on that phrase", look at your methods, methods are kind of structures that has statements/or statements inside of it, it should not have a semi colons, you only use it if you plan to write abstract classes, well in your case its not.

  3. The Following User Says Thank You to chronoz13 For This Useful Post:

    r3dApple (January 11th, 2012)

  4. #3
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    Default Re: What's the bug in this code?

    Aaaah, yes, thankyou, I figured it out literally just before checking back here. There are semicolons at the ends of the methods in the Calc class. I gotta watch out for that, thankyou for your help, too

  5. #4
    Java kindergarten chronoz13's Avatar
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    Default Re: What's the bug in this code?

    dont consider it an error, its also a valid statement, unfortunately not in your case, dont forget about abstract classes

  6. #5
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    Default Re: What's the bug in this code?

    I'll keep that in mind. Thanks once again.

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