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Thread: read a double type on the keyboard

  1. #1
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    Angry read a double type on the keyboard

    hello
     public static void main(String[] args) {
       double n;
       Scanner sc=new Scanner(System.in );
      n=sc.nextDouble();
     
      }
    when i enter a decimal number on the keyboard it doesn't work for example by entering 4.5

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: read a double type on the keyboard

    it doesn't work
    Please explain what "doesn't work" means.

    The code does not have any print statements to show the results or to prompt the user to enter the 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:

    Aba lino (July 18th, 2021)

  4. #3
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    Default Re: read a double type on the keyboard

     public static void main(String[] args) {
       double n;
       Scanner sc=new Scanner(System.in );
      System.out.println("enter a decimal number") ;
      n=sc.nextDouble();
       System.out.println("you entered" +n);
      }

    it doesn't work when i entered decimal
    Last edited by Mounkaila144; July 16th, 2021 at 11:24 AM.

  5. #4
    Super Moderator Norm's Avatar
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    Default Re: read a double type on the keyboard

    it doesn't work when i entered decimal
    Please explain what you do and what the program does. What is printed out?
    There could be many reasons why code does not work.

    Are decimal points represented by a . or by a , on your computer?
    If you don't understand my answer, don't ignore it, ask a question.

  6. #5
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    Lightbulb Re: read a double type on the keyboard

    [QUOTE=Mounkaila144;172218]hello
    [code=Java] public static void main(String[] args) {

    Scanner sc=new Scanner(System.in ); //(import java.util.Scanner before public static void main
    double n=sc.nextDouble();

    System.out.println(n);
    }
    }
    Last edited by parth31; July 18th, 2021 at 06:17 AM.

  7. #6
    Super Moderator Norm's Avatar
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    Default Re: read a double type on the keyboard

    @parth31
    What happens when you compile the code you posted? Are there errors?

    Please test your code before posting it.
    If you don't understand my answer, don't ignore it, ask a question.

  8. #7
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    Talking Re: read a double type on the keyboard

    now run the code. there is no errors right now .
    if you are interested in pair programming then E mail me at parthmishra1131@gmail.com

  9. #8
    Super Moderator Norm's Avatar
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    Default Re: read a double type on the keyboard

    Where is the print statement to ask the user to enter a number?

    How is your code different from the code in post#3?
    If you don't understand my answer, don't ignore it, ask a question.

  10. #9
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    Red face Re: read a double type on the keyboard

    oh , you want take input from user .
    wait then .

    Scanner sc = new Scanner (System.in);

    System.out.println(" enter your decimal number ");
    double number = sc.nextDouble();

    System.out.println = (number);

    // norm , program #3 is also right . i think i missed to see it .
    // Go with anyone both are kindly similar .

  11. #10
    Super Moderator Norm's Avatar
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    Default Re: read a double type on the keyboard

    Also note that post#3 used code tags which you have not used with your code.
    If you don't understand my answer, don't ignore it, ask a question.

  12. #11
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    Default Re: read a double type on the keyboard

    like? can you please elaborate...

  13. #12
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    Default Re: read a double type on the keyboard

    Look at post#3 to see how the code is formatted.
    If you don't understand my answer, don't ignore it, ask a question.

  14. #13
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    Default Re: read a double type on the keyboard

    now its totally upto you, i write the code in easy way as easy i can write.

  15. #14
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    Default Re: read a double type on the keyboard

    I don't understand why you are posting on this thread instead of working on the thread that you started.
    If you don't understand my answer, don't ignore it, ask a question.

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