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CENG 102 Assignment #3

 

Assigned: 22/11/05, Tuesday

Due: 30/11/05, Wednesday at 14:00

 

Homeworks must be delivered at the deadline date and hour.

 

 

(10 pts.)   Implement class StrangeArray.

StrangeArray has one field: theArr, an array of ints.

There are three internal methods:

  • setSize() asks the user to enter a size and allocates an int array of that size to theArr
  • loadArr() for each element in the array, asks the user to enter an int. If the number is negative, ask the user to re-enter. Otherwise set the value of that array element to the int.
  • printArr() print the contents of the array.

There is one static method: changeArr() takes an integer and returns the integer squared plus 37. This method should be public, as everyone will want to use it.

StrangeArray should have a main method that does the following:

  • call setSize() to size theArr
  • call loadArr() to get values into theArr
  • print the contents of theArr with printArr()
  • changeArr() every element of theArr
  • print the contents again

 

 

 

Here's the output from a sample run:

  

text
  1.  
  2. $ java StrangeArray
  3. (setSize) Enter the size of the array: 5
  4. (loadArr) Enter element 0: 4
  5. (loadArr) Enter element 1: 27
  6. (loadArr) Enter element 2: -3
  7. (loadArr) Please enter a positive number
  8. (loadArr) Enter element 2: 12
  9. (loadArr) Enter element 3: 94
  10. (loadArr) Enter element 4: 17
  11. (printArr) The array now contains:
  12. (printArr)   [0]: 4
  13. (printArr)   [1]: 27
  14. (printArr)   [2]: 12
  15. (printArr)   [3]: 94
  16. (printArr)   [4]: 17
  17. (main) changeArr...
  18. (printArr) The array now contains:
  19. (printArr)   [0]: 53
  20. (printArr)   [1]: 766
  21. (printArr)   [2]: 181
  22. (printArr)   [3]: 8873
  23. (printArr)   [4]: 326
  24.  
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CENG102Homework3Q3.java
  1.  
  2.  
  3. /**
  4.  * 3.(10 pts.)   Implement class StrangeArray.
  5.  * StrangeArray has one field: theArr, an array of ints.
  6.  * There are three internal methods:
  7.  *setSize() asks the user to enter a size and allocates an int array of that size to theArr
  8.  *loadArr() for each element in the array, asks the user to enter an int.
  9.  *If the number is negative, ask the user to re-enter.
  10.  *Otherwise set the value of that array element to the int.
  11.  *printArr() print the contents of the array.
  12.  *
  13.  *There is one static method: changeArr() takes an integer and returns the integer squared plus 37.
  14.  * This method should be public, as everyone will want to use it.
  15.  *StrangeArray should have a main method that does the following:
  16.  *call setSize() to size theArr
  17.  *call loadArr() to get values into theArr
  18.  *print the contents of theArr with printArr()
  19.  *changeArr() every element of theArr
  20.  *print the contents again
  21.  *
  22.  *Here's the output from a sample run:
  23.  *$ java StrangeArray
  24.  *(setSize) Enter the size of the array: 5
  25.  *(loadArr) Enter element 0: 4
  26.  *(loadArr) Enter element 1: 27
  27.  *(loadArr) Enter element 2: -3
  28.  *(loadArr) Please enter a positive number
  29.  *(loadArr) Enter element 2: 12
  30.  *(loadArr) Enter element 3: 94
  31.  *(loadArr) Enter element 4: 17
  32.  *(printArr) The array now contains:
  33.  *(printArr)   [0]: 4
  34.  *(printArr)   [1]: 27
  35.  *(printArr)   [2]: 12
  36.  *(printArr)   [3]: 94
  37.  *(printArr)   [4]: 17
  38.  *(main) changeArr...
  39.  *(printArr) The array now contains:
  40.  *(printArr)   [0]: 53
  41.  *(printArr)   [1]: 766
  42.  *(printArr)   [2]: 181
  43.  *(printArr)   [3]: 8873
  44.  *(printArr)   [4]: 326
  45.  *$
  46.  *
  47.  * @see
  48.  * <A xhref="/Web">
  49.  *  Java source code for this class. </A>
  50.  * @author Ahmet Faruk Bişkinler
  51.  * <A xhref="mailto:
 Bu e-Posta adresi istek dışı postalardan korunmaktadır, görüntülüyebilmek için JavaScript etkinleştirilmelidir
 "> mail to Author</A>
  52.  * @version November 29,2005
  53.  */
  54.  
  55.  
  56. import java.util.*;
  57. public class StrangeArray {
  58.  
  59.     public static int theArr[];
  60.     Scanner in = new Scanner(System.in);
  61.  
  62.     public static void main(String[] args) {
  63.         System.out.println("Enter the size of the array: ");
  64.         Scanner in = new Scanner(System.in);
  65.         int size = in.nextInt();
  66.         // the method to be implemented
  67.         setSize(size);
  68.         loadArr();
  69.         printArr();
  70.         changeArr();
  71.         printArr();
  72.     }
  73.     /**
  74.      * Asks the user to enter a size and allocates an int array of that size to theArr
  75.      * @param size size of theArr
  76.      */
  77.     public static void setSize(int size){
  78.         theArr = new int[size];
  79.     }
  80.     /**
  81.      * for each element in the array, asks the user to enter an int.
  82.      * If the number is negative, ask the user to re-enter.
  83.      * Otherwise set the value of that array element to the int.
  84.      * */
  85.     public static void loadArr(){
  86.         Scanner in = new Scanner(System.in);
  87.  
  88.         for (int i=0 ; i<theArr.length ; i++ ){
  89.             System.out.printf("Enter element %d: \n",i);
  90.             theArr[i] = in.nextInt();
  91.             while (theArr[i] < 0 ){
  92.                 System.out.println("Please enter a positive number :");
  93.                 System.out.printf("Enter element %d: \n",i);
  94.                 theArr[i] = in.nextInt();
  95.             }
  96.         }
  97.     }/**
  98.     *print the contents of the array.
  99.     */
  100.     public static void printArr(){
  101.         System.out.printf("\nThe array now contains: \n\n");
  102.         for (int i=0 ; i < theArr.length ; i++ ){
  103.             System.out.printf("The %d. Element is %d \n",i+1,theArr[i]);
  104.         }
  105.     }
  106.     /**
  107.      * Takes an integer and returns the integer squared plus 37.
  108.      * This method should be public, as everyone will want to use it.
  109.      * @return the integer squared plus 37.
  110.      * */
  111.     public static int changeArr(){
  112.         for (int i=0 ; i < theArr.length ; i++ ){
  113.             theArr[i] =theArr[i] * theArr[i] + 37;
  114.         }
  115.         return 0;
  116.     }
  117. }
  118.  
  119.  
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