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Thread: Not Looping? (do - while) bad execution!

  1. #1
    Java kindergarten chronoz13's Avatar
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    Default Not Looping? (do - while) bad execution!

    this program only asks me the first input
    Enter The Max Value
    then the whole program stops

    public static void main(String[] args) {
     
            int count = 0;
     
            System.out.print("Enter The Max Value: ");
            int max = sc.nextInt();
     
            System.out.print("Which Value Do You Want To Display Even Or Odd?");
            String answer = sc.nextLine();
     
            do {
     
                count++;
     
                if (answer.equalsIgnoreCase("even")) {
     
                    if (count % 2 == 0) {
     
                        System.out.println(count);
                    }
                }
            }
            while (count != max);     
        }
    }
    Last edited by chronoz13; November 23rd, 2009 at 11:00 AM.


  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: Not Looping? (do - while) bad execution!

    There's no case to handle the odd numbers. Also, because of the funny implementation of nextInt(), it's not consuming the next line character when you input the max value.

    Also, there is a much better method to print out odd/even numbers: use an if statement for even/odd, then iterate through all even/odd numbers up to max.

            System.out.print("Enter The Max Value: ");
            int max = sc.nextInt();
     
            System.out.print("Which Value Do You Want To Display Even Or Odd?");
            sc.nextLine(); // consume \n from above
            String answer = sc.nextLine();
     
            if ("even".equalsIgnoreCase(sc))
            {
                    for (int i = 0; i < max; i+=2)
                    {
                            System.out.println(i);
                    }
            }
            else if ("odd".equalsIgnoreCase(sc))
            {
                    for (int i = 1; i < max; i+= 2)
                    {
                            System.out.println(i);
                    }
            }
            else
            {
                    System.out.println("You didn't enter even or odd. quiting.");
            }

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