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| package com.matrix.calculator; | |
| import java.io.*; | |
| import java.util.Scanner; | |
| public class Calculator { | |
| public static void main(String[] args) { | |
| // write your code here | |
| System.out.println("Please Enter nine digits separated by spaces to construct your matrix: "); | |
| Scanner scanner = new Scanner(System.in); | |
| //true because we want to append to what ever is in the file already | |
| var fileName = "matrix.txt"; | |
| writeMatrixFile(scanner, fileName); | |
| readMatrixFile(fileName); | |
| } | |
| private static void writeMatrixFile(Scanner scanner, String fileName) { | |
| try (FileWriter writer = new FileWriter(fileName, true); BufferedWriter bufferedWriter = new BufferedWriter(writer)) { | |
| String[] user_input = scanner.nextLine().strip().split(" "); | |
| for (int i = 0; i < user_input.length; i++) { | |
| final int integer = Integer.valueOf(user_input[i].trim()); | |
| if (i == 3 | i == 6 | i == 9) { | |
| bufferedWriter.newLine(); | |
| } | |
| bufferedWriter.write(integer + " "); | |
| } | |
| } catch (IOException ignored) { | |
| } | |
| } | |
| private static void readMatrixFile(String fileName) { | |
| int[][] user_input_ = new int[3][3]; | |
| try (FileReader reader = new FileReader(fileName); BufferedReader bufferedReader = new BufferedReader(reader); | |
| FileWriter writer = new FileWriter(fileName, true); BufferedWriter bufferedWriter = new BufferedWriter(writer)) { | |
| String line; | |
| int i = 0; | |
| while ((line = bufferedReader.readLine()) != null && !line.isEmpty() && !line.isBlank()) { | |
| String[] lineSplit = line.strip().split(" "); | |
| for (int j = 0; j < lineSplit.length; j++) { | |
| user_input_[i][j] = Integer.valueOf(lineSplit[j].trim()); | |
| } | |
| i++; | |
| } | |
| int difference = (user_input_[0][0] * user_input_[1][1] * user_input_[2][2]) | |
| - (user_input_[0][2] * user_input_[1][1] * user_input_[2][0]); | |
| bufferedWriter.newLine(); | |
| bufferedWriter.write("difference : " + difference + " "); | |
| bufferedWriter.newLine(); | |
| } catch (IOException ignored) { | |
| } | |
| } | |
| } |
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