// ****************************************************************
//   PowersOf2.java
//
//   Print out as many powers of 2 as the user requests
//
// ****************************************************************
import java.util.Scanner;

public class PowersOf2
{
    public static void main(String[] args)
    {
        Scanner scan = new Scanner(System.in);

        int nextPowerOf2 = 1;  // current power of 2
        int exponent = 0;      // highest power of 2 to compute

        System.out.print("Enter the highest power of 2 you want to display?");
        exponent = scan.nextInt();

        while (exponent >= 0)
        {
           // fill in loop body here

        }
    }
}