This program calculates the powers of 2 from power = 0 to power = 20 and adds them together
* For example, to add all powers of 2 from power = 2 to power = 4 then the result is:
* 2^2 = 4 plus 2^3 = 8 plus 2^4 = 16 so the final result is: 4+8+16 = 28
*
*
*/
public class PrintAllPowers
{
public static void main(String[] args)
{
//-----------Start below here. To do: approximate lines of code = 1
// Create an integer variable called sum and initialize it to 0

//-----------------End here. Please do not remove this comment. Reminder: no changes outside the todo regions.

  //-----------Start below here. To do: approximate lines of code = 2
  // Write a for loop that counts from 0 to 20 (inclusive). Declare and use a variable called power as the loop variable
  // Inside the loop use the Math.pow(double a, double b) function compute 2^power and add it to the sum variable
 
 
 
 
  //-----------------End here. Please do not remove this comment. Reminder: no changes outside the todo regions.
  System.out.println("Sum = " + sum ) ;
  System.out.println("Expected: ") ;
  System.out.println("Sum = " + 2097151) ;
 

//-----------Start below here. To do: approximate lines of code = 6
// Reset sum variable to 0 and then repeat the loop as above
// Inside the loop, instead of calling Math.pow, use an inner loop to calculate 2^power and add the result to the sum variable

Answer rating: 100% (QA)

This program calculates the powers of 2 from power 0 to power 20 and adds them toge... View the full answer