Question

_{This is in Java being run through Eclipse.}

_{/**
   * Creates an array of all the powers of two, up to (and including)
   * the given exponent starting at 2^0.
   *
   * If the given exponent is less than zero, return an empty array.
   * You can do this by saying "return new int[0];"
   *
   * For example:
   * powersOfTwo(3) returns {1,2,4,8}
   * powersOfTwo(0) returns {1}
   * powersOfTwo(-66) returns {}
   *
   * Requires: arrays, for loops
   */}

Answer 1

import java.util.Arrays;

public class ArrayPowers {
   public static void main(String[] args) {
       System.out.println(Arrays.toString(getPowers(3)));
   }

   public static double [] getPowers(int n) {
       if(n<0)
           return new double[0];
       // creating array with size
       double d []= new double[n+1];
       // finding powers
       for(int i=0;i<=n;i++){
           d[i]=Math.pow(2, i);
       }
       return d;
   }
}