Homework

Previously we have written a program to check if a number is perfect:

public static void main(String[] args) { Scanner input = new Scanner(System.in); int x, sum, i; x = input.nextInt(); sum = 0; for ( i = 1; i < x; i++ ) if ( x%i == 0 ) // i is a divisor of x sum = sum + i; // Add i to sum if ( sum == x ) System.out.println("is a perfect number"); else System.out.println("is not a perfect number"); }

• Create a new class called Tools and write a isPerfect(n) method in this class that returns true if the input n is a perfect number and false otherwise.

  public class Tools { public static boolean isPerfect(int n) { ... } }

  In another class (e.g.: MyProg), write a main( ) method that calls the isPerfect( ) in the Tools class and prints out all the perfect numbers that are between 1 and 1,000,000.

  public class MyProg { public static void main(String[] args) { ... // Must use the isPerfect( ) methid in the Tools class } }

  Your program is correct if you see these 4 numbers printed: 6, 28, 496 and 8128