Thread: 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");
}}}}}

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.

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.

What is the input of this program?