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Pazar, 03 Aralık 2006 22:17
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CENG 102 Assignment #2

Assigned: 19/10/05, Wednesday

Due: 26/10/05, Wednesday at 14:00

Homeworks must be delivered at the deadline date and hour.

  1. (5 points)

A number is said to be a perfect number if its factors, including 1 (but not the number itself), sum to the number. For example, 6 is a perfect number, because 6 = 1+2+3. Write a program that lists the perfect numbers between a given boundary. The boundary should be limited the same way as in assignment#1, question 1. 

CENG102Homework2Q1.java
  1.  
  2. /*************************************/
  3. /*                                   */
  4. /*       AHMET FARUK BİŞKİNLER       */
  5. /*                                   */
  6. /*     CENG 102 JAVA PROGRAMMING     */
  7. /*                                   */
  8. /*              LESSON               */
  9. /*                                   */
  10. /*   COMPUTER ENGINEERING 07010441   */
  11. /*                                   */
  12. /*       COPYRIGHT © 2003-2005       */
  13. /*                 by                */
  14. /*       AHMET FARUK BİŞKİNLER       */
  15. /*                                   */
  16. /*         */
  17. /*     http://ahbis.blogspot.com     */
  18. /*      http://afb.picom.com.tr      */
  19. /*                                   */
  20. /*        All Rights Reserved        */
  21. /*                                   */
  22. /*************************************/
  23. import java.util.Scanner;
  24. public class CENG102Homework2Q1 {
  25.     public static void main(String args[]) {
  26.  
  27.         Scanner gir = new Scanner(System.in);
  28.  
  29.         int x1, x2, sum = 1;
  30.  
  31.         System.out.println("Enter The First Interger");
  32.         x1 = gir.nextInt();
  33.  
  34.         while (x1 > 65535 || x1 < 2) {
  35.             System.out.printf("You Entered Invalid Number.\n",
  36.                     "Please Enter x1 < 65535 or x1 > 1 \n\n");
  37.  
  38.             System.out.println("Enter The First Interger: ");
  39.             x1 = gir.nextInt();
  40.         }
  41.  
  42.         System.out.println("Enter The Second Interger");
  43.         x2 = gir.nextInt();
  44.  
  45.         while (x2 < x1 || x2 < 2) {
  46.             System.out.printf("You Entered Invalid Number.\n",
  47.                     "Please Enter x2 < 65535 or x2 > 1 or x2 > x1 \n\n");
  48.  
  49.             System.out.println("Enter The Second Interger: ");
  50.             x2 = gir.nextInt();
  51.         }
  52.  
  53.         for (; x1 <= x2; x1++) {
  54.             sum = 1;
  55.             for (int j = 2; j < x1; j++) {
  56.                 if (x1 % j == 0) {
  57.                     sum += j;
  58.                 }
  59.             }
  60.             if (sum == x1) {
  61.                 System.out.println("The Number : " + x1 + " is a"
  62.                         + " Perfect Number");
  63.             }
  64.         }
  65.     }
  66. }
  67.  
  68.  
  69.  
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