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<h2>Instructions</h2>
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<h2>Test(s)</h2>
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<h2>Solution(s)</h2>
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const quizData = {"title": "009 Rotate Matrix", "hasInstructions": true, "hasTests": true, "hasSolutions": true, "instructions": "<ol><li><p>Implement console program which will meet the following requirements:</p><ol><li><p>Program starts and asks user to specify matrix size. For example if user entered \u20185\u2019 program will generate next matrix:<br><br>0.0 0.1 0.2 0.3 0.4<br>1.0 1.1 1.2 1.3 1.4<br>2.0 2.1 2.2 2.3 2.4<br>3.0 3.1 3.2 3.3 3.4<br>4.0 4.1 4.2 4.3 4.4<br></p></li><li><p>Program asks user this question with options: <br>How much do you want to rotate matrix? <br>- Press 1 to rotate matrix to 90 degrees<br>- Press 2 to rotate matrix to 180 degrees<br>- Press 3 to rotate matrix to 270 degrees</p></li><li><p>When user chosen rotation mode programs prints initial matrix and rotated one.</p></li><li><p>Rotation for 90 degrees looks like this:<br>4.0 3.0 2.0 1.0 0.0<br>4.1 3.1 2.1 1.1 0.1<br>4.2 3.2 2.2 1.2 0.2<br>4.3 3.3 2.3 1.3 0.3<br>4.4 3.4 2.4 1.4 0.4<br></p></li><li><p>Rotation for 180 degrees looks like this:<br>4.4 4.3 4.2 4.1 4.0<br>3.4 3.3 3.2 3.1 3.0<br>2.4 2.3 2.2 2.1 2.0<br>1.4 1.3 1.2 1.1 1.0<br>0.4 0.3 0.2 0.1 0.0<br></p></li><li><p>Rotation for 270 degrees looks like this:<br>0.4 1.4 2.4 3.4 4.4<br>0.3 1.3 2.3 3.3 4.3<br>0.2 1.2 2.2 3.2 4.2<br>0.1 1.1 2.1 3.1 4.1<br>0.0 1.0 2.0 3.0 4.0<br><br></p></li></ol></li></ol><p>You have to implement next methods:</p><p><strong><em>public static void rotate90(double[][] matrix) {</em></strong></p><p><strong><em> <write your code here></em></strong></p><p><strong><em>}</em></strong></p><p><br></p><p><strong><em>public static void rotate180(double[][] matrix) {</em></strong></p><p><strong><em> <write your code here></em></strong></p><p><strong><em>}</em></strong></p><p><br></p><p><strong><em>public static void rotate270(double[][] matrix) {</em></strong></p><p><strong><em> <write your code here></em></strong></p><p><strong><em>}</em></strong></p>", "tests": [{"file_name": "Evaluate.java", "content": "import org.junit.Test;\nimport org.junit.Assert;\nimport com.udemy.ucp.*;\n\nimport static org.junit.Assert.assertTrue;\n\nimport java.util.Arrays;\n\nimport org.junit.Test;\n\npublic class Evaluate {\n\t\n@Test\n\tpublic void shouldRotate90() {\n\t\tdouble[][] matrix = {\n\t\t\t\t{10.0, 10.1, 10.2},\n\t\t\t\t{32.0, 32.1, 32.2},\n\t\t\t\t{47.0, 47.1, 47.2},\n\t\t};\n\t\tMatrixRotation.rotate90(matrix);\n\t\t\n\t\tdouble[][] expectedMatrix = {\n\t\t\t\t{47.0, 32.0, 10.0},\n\t\t\t\t{47.1, 32.1, 10.1},\n\t\t\t\t{47.2, 32.2, 10.2},\n\t\t};\n\t\tassertTrue(Arrays.deepEquals(expectedMatrix, matrix));\n\t}\n\t\n\t@Test\n\tpublic void shouldRotate180() {\n\t\tdouble[][] matrix = {\n\t\t\t\t{10.0, 10.1, 10.2},\n\t\t\t\t{32.0, 32.1, 32.2},\n\t\t\t\t{47.0, 47.1, 47.2},\n\t\t};\n\t\tMatrixRotation.rotate180(matrix);\n\t\t\n\t\tdouble[][] expectedMatrix = {\n\t\t\t\t{47.2, 47.1, 47.0},\n\t\t\t\t{32.2, 32.1, 32.0},\n\t\t\t\t{10.2, 10.1, 10.0},\n\t\t};\n\t\tassertTrue(Arrays.deepEquals(expectedMatrix, matrix));\n\t}\n\t\n\t@Test\n\tpublic void shouldRotate270() {\n\t\tdouble[][] matrix = {\n\t\t\t\t{10.0, 10.1, 10.2},\n\t\t\t\t{32.0, 32.1, 32.2},\n\t\t\t\t{47.0, 47.1, 47.2},\n\t\t};\n\t\tMatrixRotation.rotate270(matrix);\n\t\t\n\t\tdouble[][] expectedMatrix = {\n\t\t\t\t{10.2, 32.2, 47.2},\n\t\t\t\t{10.1, 32.1, 47.1},\n\t\t\t\t{10.0, 32.0, 47.0},\n\t\t};\n\t\tassertTrue(Arrays.deepEquals(expectedMatrix, matrix));\n\t}\n\n}\n"}], "solutions": [{"file_name": "MatrixRotation.java", "content": "import java.util.Scanner;\r\n\r\npublic class MatrixRotation {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tScanner in = new Scanner(System.in);\r\n\r\n\t\tSystem.out.print(\"Please, enter matrix size: \");\r\n\t\tint size = in.nextInt();\r\n\t\tdouble[][] matrix = generateMatrix(size);\r\n\r\n\t\tSystem.out.println(\"How you want to rotate matrix:\" + System.lineSeparator() +\r\n\t\t\t\t\"\\t1 - 90\" + System.lineSeparator() +\r\n\t\t\t\t\"\\t2 - 180\" + System.lineSeparator() +\r\n\t\t\t\t\"\\t3 - 270\");\r\n\t\tint mode = in.nextInt();\r\n\r\n\t\tSystem.out.println(System.lineSeparator() + \"Base matrix:\" + System.lineSeparator());\r\n\t\tprintMatrixToConsole(matrix);\r\n\t\tSystem.out.println();\r\n\r\n\t\tif (rotateMatrix(matrix, mode)) {\r\n\t\t\tprintMatrixToConsole(matrix);\r\n\t\t}\r\n\t}\r\n\r\n\tprivate static double[][] generateMatrix(int size) {\r\n\t\tdouble[][] matrix = new double[size][size];\r\n\r\n\t\tfor (int i = 0; i < matrix.length; i++) {\r\n\t\t\tfor (int j = 0; j < matrix.length; j++) {\r\n\t\t\t\tmatrix[i][j] = Double.valueOf(Integer.toString(i) + \".\" \r\n\t\t\t\t\t\t+ Integer.toString(j));\r\n\t\t\t}\r\n\t\t}\r\n\t\treturn matrix;\r\n\t}\r\n\r\n\tprivate static boolean rotateMatrix(double[][] matrix, int mode) {\r\n\t\tswitch (mode) {\r\n\t\t\tcase 1:\r\n\t\t\t\tSystem.out.println(\"90 degrees rotated:\" + System.lineSeparator());\r\n\t\t\t\trotate90(matrix);\r\n\t\t\t\tbreak;\r\n\t\t\tcase 2:\r\n\t\t\t\tSystem.out.println(\"180 degrees rotated:\" + System.lineSeparator());\r\n\t\t\t\trotate180(matrix);\r\n\t\t\t\tbreak;\r\n\t\t\tcase 3:\r\n\t\t\t\tSystem.out.println(\"270 degrees rotated:\" + System.lineSeparator());\r\n\t\t\t\trotate270(matrix);\r\n\t\t\t\tbreak;\r\n\t\t\tdefault:\r\n\t\t\t\tSystem.out.println(\"You selected non-existing mode!\");\r\n\t\t\t\treturn false;\r\n\t\t\t}\r\n\t\treturn true;\r\n\t}\r\n\t\r\n\tprivate static void transposeMatrix(double[][] matrix) {\r\n\t\tdouble temp;\r\n\t\tfor (int i = 0; i < matrix.length; i++) {\r\n\t\t\tfor (int j = 0; j < i; j++) {\r\n\t\t\t\ttemp = matrix[i][j];\r\n\t\t\t\tmatrix[i][j] = matrix[j][i];\r\n\t\t\t\tmatrix[j][i] = temp;\r\n\t\t\t}\r\n\t\t}\r\n\t}\r\n\r\n\tprivate static void verticalReflection(double[][] matrix) {\r\n\t\tdouble temp;\r\n\t\tfor (int i = 0; i < matrix.length; i++) {\r\n\t\t\tfor (int j = 0; j < matrix.length / 2; j++) {\r\n\t\t\t\ttemp = matrix[i][j];\r\n\t\t\t\tmatrix[i][j] = matrix[i][matrix.length - 1 - j];\r\n\t\t\t\tmatrix[i][matrix.length - 1 - j] = temp;\r\n\t\t\t}\r\n\t\t}\r\n\t}\r\n\r\n\tprivate static void horizontalReflection(double[][] matrix) {\r\n\t\tdouble temp;\r\n\t\tfor (int i = 0; i < matrix.length / 2; i++) {\r\n\t\t\tfor (int j = 0; j < matrix.length; j++) {\r\n\t\t\t\ttemp = matrix[i][j];\r\n\t\t\t\tmatrix[i][j] = matrix[matrix.length - 1 - i][j];\r\n\t\t\t\tmatrix[matrix.length - 1 - i][j] = temp;\r\n\t\t\t}\r\n\t\t}\r\n\t}\r\n\r\n\tpublic static void rotate90(double[][] matrix) {\r\n\t\ttransposeMatrix(matrix);\r\n\t\tverticalReflection(matrix);\r\n\t}\r\n\r\n\tpublic static void rotate180(double[][] matrix) {\r\n\t\tverticalReflection(matrix);\r\n\t\thorizontalReflection(matrix);\r\n\t}\r\n\r\n\tpublic static void rotate270(double[][] matrix) {\r\n\t\ttransposeMatrix(matrix);\r\n\t\thorizontalReflection(matrix);\r\n\t}\r\n\r\n\tprivate static void printMatrixToConsole(double[][] matrix) {\r\n\t\tfor (int i = 0; i < matrix.length; i++) {\r\n\t\t\tfor (int j = 0; j < matrix.length; j++) {\r\n\t\t\t\tSystem.out.print(matrix[i][j] + \"\\t\");\r\n\t\t\t}\r\n\t\t\tSystem.out.println();\r\n\t\t}\r\n\t}\r\n\r\n\t\r\n\r\n}\r\n"}]};
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