import java.util.Scanner;

public class Example6
{
    public static void main(String [] args)
    {
        int i;
        Scanner in = new Scanner(System.in);

        for (i = 0; i < 4; i++)
            System.out.print("i=" + i + ", ");
        System.out.println();

       i = 0; 
       while(i < 4)
       {
           System.out.print("i=" + i + ", ");
           i = i + 1;
       }
       System.out.println();

       i = 0; 
       do
       {
           System.out.print("i=" + i + ", ");
           i = i + 1;
       } while(i < 4);
       System.out.println();

       i = 2; 
       // Endless loop
       do
       {
           System.out.print("i=" + i + ", ");
           //Pausing the program to wait for user input.
           System.out.print("Hit enter to continue: ");
           in.nextLine();
           i = i * 2;
       } while(i > 0);
       System.out.println();
    }
}