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Thread: List of prime number

  1. #1
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    Post List of prime number

    Hello Dear, i face a problem to solve a program; 5,7,11,...........numbers not shown.please help.

    here is my program:

    package javaapplication1.print;
    import java.util.Scanner;

    public class JavaApplication1Print {

    static Scanner hp = new Scanner(System.in);

    public static void main(String[] args) {
    double i,j;
    double m;
    double flag=0;
    double n;
    System.out.println("Enter a number upto check prime of prime not=");
    n=hp.nextInt();
    for(j=0;j<=n;j++) {

    if(j==0||j==1)

    System.out.println(j+" Not Prime");

    else{
    m = j/2;
    for(i=2;i<=m;i++){

    if(j%i==0) {
    System.out.println(j+" Not Prime");
    flag=1;
    break;
    } }

    if(flag==0) {
    System.out.println(j+" Prime");
    }}}}}

  2. #2
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    Default Re: List of prime number

    What is the input you typed?
    Whatever you are, be a good one

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    Default Re: List of prime number

    I use a scanner to give input.when run program ask to give input.then if I put 20 value.it gives the result:
    0.0 Not Prime
    1.0 Not Prime
    2.0 Prime
    3.0 Prime
    4.0 Not Prime
    6.0 Not Prime
    8.0 Not Prime
    9.0 Not Prime
    10.0 Not Prime
    12.0 Not Prime
    14.0 Not Prime
    15.0 Not Prime
    16.0 Not Prime
    18.0 Not Prime
    20.0 Not Prime

    But there 5,7,11,13,17,19 value not present.I didnot find the problem.

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    Default Re: List of prime number

    Are there any reason why you use flag ? Just use else instead.

    public class JavaApplication1Print {
     
        static Scanner hp = new Scanner(System.in);
     
        public static void main(String[] args) {
            double i, j;
            double m;
            double n;
            System.out.println("Enter a number upto check prime of prime not=");
            n = hp.nextInt();
            for (j = 0; j <= n; j++) {
                if (j == 0 || j == 1) {
                    System.out.println(j + " Prime");
                } else if (j == 2 || j == 3) {
                    System.out.println(j + "  Prime");
                } else {
                    m = j / 2;
                    for (i = 2; i <= m; i++) {
     
                        if (j % i == 0) {
                            System.out.println(j + " Not Prime");
                            break;
                        } else {
                            System.out.println(j + "  Prime");
                            break;
                        }
                    }
     
                }
            }
        }
    }
    Whatever you are, be a good one

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    Default Re: List of prime number

    Dear,The output of the program of your is given below when I put 20 value:

    Enter a number upto check prime of prime not=
    20
    0.0 Prime
    1.0 Prime
    2.0 Prime
    3.0 Prime
    4.0 Not Prime
    5.0 Prime
    6.0 Not Prime
    7.0 Prime
    8.0 Not Prime
    9.0 Prime
    10.0 Not Prime
    11.0 Prime
    12.0 Not Prime
    13.0 Prime
    14.0 Not Prime
    15.0 Prime
    16.0 Not Prime
    17.0 Prime
    18.0 Not Prime
    19.0 Prime
    20.0 Not Prime
    BUILD SUCCESSFUL (total time: 4 seconds)

    But 9 ,15 are not prime nimber, but here it shows prime.

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    Default Re: List of prime number

    Is input to the program is Dynamic or static?

    Regards

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    Default Re: List of prime number

    What is the input of this program?

  8. #8
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    Default Re: List of prime number

    Quote Originally Posted by ruhirai View Post
    What is the input of this program?
    OP input value 20
    Whatever you are, be a good one

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