1.

To declare an array, initialize an array

,

and refer to individual elements

of an array.

2.

To manipulate

a

multidimensional array.

3.

To output a

content of a multidimensional array.

// **************************************** // MagicSquare.java //// Text below is to be filled by student. //// **************************************************************** import java.util.Scanner; public class MagicSquare {int[][] square;

public MagicSquare(int size){} //-------------------------------------- //return the sum of the values in the given row //-------------------------------------- private int sumMagicRow(int row){int sum = 0; return sum;} //-------------------------------------- //return the sum of the values in the given column //-------------------------------------- private int sumMagicCol(int col) { int sum = 0; // return sum;} //-------------------------------------- //return the sum of the values in the main diagonal //-------------------------------------- private int sumMagicDiagMain() {int sum = 0; // return sum;} //-------------------------------------- //return the sum of the values in the other ("reverse") diagonal //-------------------------------------- private int sumMagicDiagRev(){int sum = 0;// ......return sum; }//-------------------------------------- //return true if the square is magic (all rows, cols, and diags// have same sum), false otherwise //-------------------------------------- public boolean isMagicSquare(){boolean answer = true; // return answer;} //-------------------------------------- //compute and display sums of square including row, column, main diagonal, and other diagonal //-------------------------------------- public void printMagicSquareSums() {// } //-------------------------------------- //read info into the square from the input stream associated with//the Scanner parameter //-------------------------------------- public void readSquare(Scanner scan) { for (int row = 0; row

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// **************************************************************** // MagicSquareTest.java //// Text below is to be filled by student. //// **************************************************************** import java.util.Scanner; import java.io.IOException; import java.io.File; public class MagicSquareTest { public static void main(String[] args) throws IOException { Scanner scan = new Scanner(new File("magicText.txt")); // make sure that the file magicData is in the current directoryint count = 1; //count which square we're onint size = scan.nextInt(); //size of next square //Expecting -1 at bottom of input filewhile (size != -1) { //create a new Square of the given sizeMagicSquare s = new MagicSquare(size); //call its read method to read the values of the square System.out.println(" ***** Square " + count + " *****");s.readSquare(scan); //print the squares.printSquare(); //print the square id//print the sums //determine and print whether it is a magic square //get size of next square size = scan.nextInt(); count++; } } }

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txt file is

3

8 1 6

3 5 7

4 9 2

7

30 39 48 1 10 19 28

38 47 7 9 18 27 29

46 6 8 17 26 35 37

5 14 16 25 34 36 45

13 15 24 33 42 44 4

21 23 32 41 43 3 12

22 31 40 49 2 11 20

4

48 9 6 39

27 18 21 36

15 30 33 24

12 45 42 3

3

6 2 7

1. 5 3

2. 9 4

4

3. 16 2 13

6 9 7 12

10 5 11 8

15 4 14 1

5

17 24 15 8 1

23 5 16 14 7

4. 6 22 13 20

10 12 3 21 19

11 18 9 2 25

7

30 39 48 1 10 28 19

38 47 7 9 18 29 27

46 6 8 17 26 37 35

5. 14 16 25 34 45 36

13 15 24 33 42 4 44

21 23 32 41 43 12 3

22 31 40 49 2 20 11

- 1

Lab work (in school laboratory): This lab's objective is to exercise with usages of Java's array features. We would like to apply this learning to determine if a two-dimensional array is a magic square. A magic square is a square matrix in which the sum of every row, every column, and both diagonals is the same. An example below is a magic square: 2 7 6 15 9 5 1-15 438-15 15 15 15 15 15