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Thread: I except show this FIRST - JAVA

  1. #1
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    Default I except show this FIRST - JAVA

    Hello,

    Could you please run this?
    I except show "Enter N:" but the program waiting to receive the number.

     
    import java.util.Scanner;
     
    public class NewMain {
     
        public static  boolean isPrime(int n)
        {
            boolean flag = true;
            for(int i = 2 ; i < n ; i++)
            {
                if (n %i == 0)
                {
                    flag = false;
                    break;
                }
            }
            return flag;
        }
     
        public static void Range(int a , int b)
        {
            for (int i = a ; i <=b ; i++)
            {
                   if (!isPrime(i))
            {
                System.out.printf("\n%d is NOT Prime!",i);
            }
            else
            {
                  System.out.printf("\n%d is Prime!",i);
            }
            }
        }
     
        public static void main(String[] args)
        {
            Scanner scan = new Scanner(System.in);
            System.out.printf("Enter N: "); // I except show this FIRST
     
            int n = scan.nextInt(); // But this run FIRST!
            boolean flag = isPrime(n);
                 if (!flag)
            {
                System.out.printf("\n%d is NOT Prime!",n);
            }
            else
            {
                  System.out.printf("\n%d is Prime!",n);
            }
              System.out.printf("Enter A: ");
              int a = scan.nextInt();
              System.out.printf("Enter B: ");
              int b = scan.nextInt();
              Range(a,b);
        }
     
    }

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: I except show this FIRST - JAVA

    The program prints a prompt on the console and waits for me to enter a number.
    If you don't understand my answer, don't ignore it, ask a question.

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

    shervan360 (April 10th, 2021)

  4. #3
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    Default Re: I except show this FIRST - JAVA

    Thanks, but this is for me:

    10
    Enter N:
    20
    30
    10 is NOT Prime!Enter A: Enter B:
    20 is NOT Prime!
    21 is NOT Prime!
    22 is NOT Prime!
    23 is Prime!
    24 is NOT Prime!
    25 is NOT Prime!
    26 is NOT Prime!
    27 is NOT Prime!
    28 is NOT Prime!
    29 is Prime!
    30 is NOT Prime!

  5. #4
    Super Moderator Norm's Avatar
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    Default Re: I except show this FIRST - JAVA

    Where and how are you executing the program?
    On Win10 I opened a command prompt window and entered the command: java NewMain
    If you don't understand my answer, don't ignore it, ask a question.

  6. The Following User Says Thank You to Norm For This Useful Post:

    shervan360 (April 10th, 2021)

  7. #5
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    Default Re: I except show this FIRST - JAVA

    Win 10 and netbeans 13 (output window)

  8. #6
    Super Moderator Norm's Avatar
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    Default Re: I except show this FIRST - JAVA

    What happens when you execute the program in the command prompt outside of NB?
    What is output window? Does NB interact with the console in the same way the the command prompt window does?
    If you don't understand my answer, don't ignore it, ask a question.

  9. #7
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    Default Re: I except show this FIRST - JAVA

    Try to add

    System.out.flush();

    after System.out.printf

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