For

import java.util.*;
import java.math.*;
public class Forrr
{

    /**
     * @param args
     */
    public static void main(String[] args)
    {
        // ex1
        for (int i = 10; i<100; i++)
        {
            System.out.println(i);
        }
        // ex2
        for (int i =100, x, y, z; i<1000; i++)
        {
            x = i %10;
            y = (i/10)%10;
            z = i/100;
            if (x!= y && x!= z && y!= z )
            {
                System.out.println (i);
            }
        }
        //ex 3
        for ( int i= 0, x, y, z; i<50; i++)
        {
            int r = (int)  (Math.random () *1000 +100) ;

            x = r %10;
            y = (r/10)%10;
            z = r/100;
            System.out.println (r);
            System.out.println (x + y + z);
        }
        //ex4
        boolean prime = true;
        int lim = 2222, rt;
        for (int i = 2; i<=lim; i++)
        {
            prime =true;
            rt = (int) Math.sqrt(i);
            for (int ii= 2; ii<rt+1; ii++)
            {
                if (i%ii==0) prime=false;

            }
            if (prime) System.out.println (i + "is a prime");
        }

    }

}