2.a.Prime numbers

Week 2 :

a)    Write a Java program that prompts the user for an integer and then prints out all prime numbers up to that integer.

import java.lang.*;

import java.io.*;

class prime

{

  public static void main(String args[])

 {

  int n=Integer.parseInt(args[0]);

  for(int r=0;r

  {

   int t=0;

   for(int i=1;i

  {

   if (r%i==0)

  {

   t++;

   }

  }

  if(t<2)

  {

   system.out.print(r);

   system.out.print(" ");

   }

  }

 }

}