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Thread: Redefine Intergers

  1. #1
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    Default Redefine Intergers

    Hi,
    For my program (dunno if you'd call it a program really yet ) I want to create a 'Do you want to Continue sort of thing incorporating a while loop to redo it, but because the interger will already have been defined there's an error in compilation. How can I tell Java to redefine/overwrite the number so this'll work? This is the code.

    import java.util.Scanner;
    import java.io.File;
    import java.io.IOException;
     
    public class ChoiceofRandomNumberwithPeople
    {
        public static void main(String[] args) throws IOException
        {
            Scanner r = new Scanner(System.in);
            Scanner l = new Scanner(System.in);
            Scanner p = new Scanner(System.in);
            Scanner q = new Scanner(System.in);
            System.out.println("Ok! Enter 4 People");
            String firstname = r.nextLine();
            String secondname = l.nextLine();
            String thirdname = p.nextLine();
            String fourthname = q.nextLine();
     
            int aNumber = 0;
            {
            int myRandom = (int) ((Math.random()) * 4);
            while (aNumber < 2)
     
            if((int)(myRandom) == 1)
            {
                System.out.println(firstname);  
                System.out.println("Do you want another Random Person?");
                int aNumber = r.nextInt();
            }
     
            if((int)(myRandom) == 2)
            {
                System.out.println(secondname);
                System.out.println("Do you want another Random Person?");
                int aNumber = r.nextInt();
            }
     
            if((int)(myRandom) == 3)
            {
                System.out.println(thirdname);
                System.out.println("Do you want another Random Person?");
                int aNumber = r.nextInt();
            }
     
            if((int)(myRandom) == 4)
            {
                System.out.println(fourthname);
                System.out.println("Do you want another Random Person?");
                int aNumber = r.nextInt();
            }
            }
        }
    }

    Thanks for your help.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Redefine Intergers

    here's an error in compilation.
    Please copy and paste the full text of the error message here.

  3. #3
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    Default Re: Redefine Intergers

    File: C:\Users\Edmund Cox\Java Programming\Random\Choose Maximum Random Number\ChoiceofRandomNumberwithPeople.java [line: 28]
    Error: C:\Users\Edmund Cox\Java Programming\Random\Choose Maximum Random Number\ChoiceofRandomNumberwithPeople.java:28: aNumber is already defined in main(java.lang.String[])
    File: C:\Users\Edmund Cox\Java Programming\Random\Choose Maximum Random Number\ChoiceofRandomNumberwithPeople.java [line: 35]
    Error: C:\Users\Edmund Cox\Java Programming\Random\Choose Maximum Random Number\ChoiceofRandomNumberwithPeople.java:35: aNumber is already defined in main(java.lang.String[])
    File: C:\Users\Edmund Cox\Java Programming\Random\Choose Maximum Random Number\ChoiceofRandomNumberwithPeople.java [line: 42]
    Error: C:\Users\Edmund Cox\Java Programming\Random\Choose Maximum Random Number\ChoiceofRandomNumberwithPeople.java:42: aNumber is already defined in main(java.lang.String[])
    File: C:\Users\Edmund Cox\Java Programming\Random\Choose Maximum Random Number\ChoiceofRandomNumberwithPeople.java [line: 49]
    Error: C:\Users\Edmund Cox\Java Programming\Random\Choose Maximum Random Number\ChoiceofRandomNumberwithPeople.java:49: aNumber is already defined in main(java.lang.String[])

    It's just saying it's already been defined.

  4. #4
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    Default Re: Redefine Intergers

    Why do you want to define more than one variable with the same name?
    Could you give a new name to the variables where the compiler is complaining?

    Do you really want to define a new variable? Or do you want to assign a new value to an existing variable?
    Do you know the difference between
    defining a variable: <datatype> <variable name> ...
    and using an existing variable: <variable name> = ....

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    Default Re: Redefine Intergers

    Ok. I just removed "int" like you said and it works. Thanks.

  6. #6
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    Default Re: Redefine Intergers

    Some comments on your code:
    if((int)(myRandom) == 1)
    You don't need to cast an int: if(myRandom == 1)

    You could use one Scanner here instead of 4:
            Scanner aScanner = new Scanner(System.in);
            System.out.println("Ok! Enter 4 People");
            String firstname = aScanner.nextLine();
            String secondname =aScanner.nextLine();
            String thirdname = aScanner.nextLine();
            String fourthname = aScanner.nextLine();

  7. #7
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    Default Re: Redefine Intergers

    Some advice: don't cram all your code into the main method. Learn how methods work. Then you can break your program down into smaller steps and place each step in its own method.
    Improving the world one idiot at a time!

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