Here\'s the question I\'m having some issues with. I basically have to fill i

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Here's the question I'm having some issues with. I basically have to fill in the three methods (rowSum(), colSum(), and diagSum()) : An n x n matrix that is filled with the numbers 1, 2, 3, …, n^2 is a magic square if the sum of the elements in each row, in each column, and in the two diagonals is the same value. The MagicSquare class that follows holds a two-dimensional array, and the method isSquare() determines if the array matrix forms a magic square. There are three methods missing in the class that you must provide: rowSum(), colSum(), and diagSum(). Here is the code, and any help is appreciated, thanks! /** * MagicSquare - determines if array forms a magic square. */ public class MagicSquare { private int[][]square; /** * Constructor - passed in a square */ public MagicSquare(int[][]inSquare) { square = inSquare; } /** * isMagic - determines if array forms a magic square. * * @return true if array is a magic square, false otherwise */ public boolean isMagic() { // test if two dimensions are the same if (square.length != square[0].length) { return false; // not n x n } // test that all integers are represented for (int num = 1; num <= square.length * square.length; num++) { boolean found = false; for (int i = 0; i < square.length && found == false; i++) { for (int j = 0; j < square.length; j++) { if (square[i][j] == num) { found = true; break; // out of inner for loop } } } if (found == false) // number not in array { return false; } } // test that any row, column or diagonal did not match if (rowSum() == -1 || colSum() == -1 || diagSum() == -1) { return false; } // test that the sums of rows, columns, and diagonals are same if (rowSum() != colSum() || colSum() != diagSum()) { return false; } // it is a magic square return true; } /** * rowSum - determines sum of rows. * * @return sum of rows if all the same, -1 otherwise */ public int rowSum() {
// create method here } /** * colSum - determines sum of columns. * * @return sum of columns if all the same, -1 otherwise */ public int colSum() { // create method here
 } /** * diagSum - determines sum of the two diagonals. * * @return sum of two diagonals if the same, -1 otherwise */ public int diagSum() {
// create method here } }

Explanation / Answer

public class MagicSquare { public static void main(String[] args) { int N = Integer.parseInt(args[0]); if (N % 2 == 0) throw new RuntimeException("N must be odd"); int[][] magic = new int[N][N]; int row = N-1; int col = N/2; magic[row][col] = 1; for (int i = 2; i

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<p>Here\'s the question I\'m having some issues with. I basically have to fill i

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