// ****************************************************************
//   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) {
        int numPowersOf2;        //How many powers of 2 to compute
        int nextPowerOf2 = 1;    //Current power of  2
        int exponent;            //Exponent for current power of 2 -- this
                                 //also serves as a counter for the loop
        Scanner scan = new Scanner(System.in);

        System.out.println("How many powers of 2 would you like printed?");
        numPowersOf2 = scan.nextInt();
        
        // add code below each comment to carry out the action
        // listed in the comment; more than one statement may be needed
        // in some cases
        
        // print a message saying how many powers of 2 will be printed
        System.out.println(numPowersOf2 + " powers of 2 will be printed!");
        
        // initialize exponent -- the first thing printed is 2 to the what?
        exponent = 0;

        while (exponent <= numPowersOf2) {
          //print out current power of 2
          System.out.println("2^" + exponent + " = "+ nextPowerOf2);
          //find next power of 2 -- how do you get this from the last one?
          nextPowerOf2 = nextPowerOf2 * 2;
          //increment exponent
          exponent++;
        }
    }
}
// ****************************************************************
//   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) {
        int numPowersOf2;        //How many powers of 2 to compute
        int nextPowerOf2 = 1;    //Current power of  2
        int exponent;            //Exponent for current power of 2 -- this
                                 //also serves as a counter for the loop
        Scanner scan = new Scanner(System.in);

        System.out.println("How many powers of 2 would you like printed?");
        numPowersOf2 = scan.nextInt();
        
        // add code below each comment to carry out the action
        // listed in the comment; more than one statement may be needed
        // in some cases
        
        // print a message saying how many powers of 2 will be printed
        System.out.println((numPowersOf2 + 1) + " powers of 2 will be printed!");
        
        // initialize exponent -- the first thing printed is 2 to the what?
        exponent = 0;

        while (exponent <= numPowersOf2) {
          //print out current power of 2
          System.out.println("2^" + exponent + " = "+ nextPowerOf2);
          //find next power of 2 -- how do you get this from the last one?
          nextPowerOf2 = nextPowerOf2 * 2;
          //increment exponent
          exponent++;
        }
    }
}
Fix total number of values printed