university java assignment.

import java.io.*; public class Activity5D { public static void main(String[] args) { processSquaresFromFile("squares.txt"); System.out.println("\nEnd of processing."); } public static void processSquaresFromFile(String filename) { BufferedReader inputFile; String firstLine; int[][] square; try { inputFile = new BufferedReader(new FileReader(filename)); firstLine = inputFile.readLine(); while (firstLine != null) { square = readSquare(inputFile, firstLine); printSquare(square); check(square); firstLine = inputFile.readLine(); } inputFile.close(); } catch (IOException ioe) { System.out.println(ioe.getMessage()); ioe.printStackTrace(); } } public static int[][] readSquare(BufferedReader inputFile, String firstLine) throws IOException { String[] split; String inputLine; int[][] square; int squareSize; squareSize = Integer.parseInt(firstLine); System.out.println("\nSize: " + squareSize); square = new int[squareSize][squareSize]; for (int row = 0; row < squareSize; row++) { inputLine = inputFile.readLine(); System.out.println(inputLine); split = inputLine.split("\\s+"); for (int col = 0; col < squareSize; col++) { square[row][col] = Integer.parseInt(split[col]); } } return square; } public static void printSquare(int[][] magicSquare) { for (int row=0; row < magicSquare.length; row++) { for (int col=0; col < magicSquare[row].length; col++) { System.out.print(magicSquare[row][col] +"\t"); } System.out.println(); } } public static void check(int[][] array) { boolean overall; boolean rows, columns; boolean values; int magicConstant; if (!isSquare(array)) { System.out.println("The array is not square."); overall = false; } else { magicConstant = magicConstant(array); System.out.println("The magic constant is " + magicConstant); rows = checkRows(array, magicConstant); columns = checkColumns(array, magicConstant); values = checkValues(array, magicConstant); overall = rows && columns && values; } if (overall) { System.out.println("This is a magic square."); } else { System.out.println("This is NOT a magic square."); } } public static boolean isSquare(int[][] array) { boolean result; if (array.length == 0) { result = true; } else { result = array.length == array[0].length; } return result; } public static int magicConstant(int[][] square) { return (square.length * (square.length * square.length + 1)) / 2; } public static boolean checkRows(int[][] square, int magicConstant) { int length; int wrong; int sum; length = square.length; wrong = 0; for (int row = 0; row < length; row++) { sum = 0; for (int col = 0; col < length; col++) { sum += square[row][col]; } if (sum != magicConstant) { wrong++; } } System.out.println("There were " + wrong + " invalid rows."); return wrong == 0; } public static boolean checkColumns(int[][] square, int magicConstant) { int length; int wrong; int sum; length = square.length; wrong = 0; for (int col = 0; col < length; col++) { sum = 0; for (int row = 0; row < length; row++) { sum += square[row][col]; } if (sum != magicConstant) { wrong++; } } System.out.println("There were " + wrong + " invalid columns."); return wrong == 0; } public static boolean checkValues(int[][] square, int magicConstant) { int[] counts; int length; int wrong; length = square.length; counts = new int[length * length + 1]; wrong = 0; for (int row = 0; row < length; row++) { for (int col = 0; col < length; col++) { if (square[row][col] < 1 || square[row][col] > length * length) { wrong++; } else { counts[square[row][col]]++; } } } for (int i = 1; i <= length * length; i++) { if (counts[i] > 1) { wrong++; } } System.out.println("There were " + wrong + " repeated or invalid values."); return wrong == 0; } }