Created
November 4, 2014 15:21
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| import java.awt.Point; | |
| public class Main { | |
| public static void printMatrix(int[][] mat) { | |
| for (int i = 0; i < mat.length; i++) | |
| { | |
| for (int j = 0; j < mat.length; j++) | |
| System.out.print(mat[i][j] + " "); | |
| System.out.print("\n"); | |
| } | |
| } | |
| public static void handleDefault() { | |
| Io.print("You have to choose between 1-3"); | |
| } | |
| /* | |
| * grades | |
| */ | |
| public static void task1() { | |
| int[] grades = new int[6]; | |
| int counter = 0, sum = 0; | |
| double avg; | |
| for (int i = 0; i < grades.length; i++) { | |
| grades[i] = Io.promptInt("enter grade for " + (i + 1) + ": "); | |
| try { | |
| if (grades[i] > 100) | |
| throw new Exception("illegal grade."); | |
| else if (grades[i] < 0) | |
| throw new Exception("grades cannot be negative."); | |
| else { | |
| counter++; | |
| sum += grades[i]; | |
| } | |
| } | |
| catch (Exception e) { | |
| Io.print(e.getMessage()); | |
| } | |
| } | |
| avg = (double)sum / counter; | |
| Io.print("avg: " + avg); | |
| Io.print("amount of legal grades: " + avg); | |
| } | |
| /* | |
| * chess | |
| */ | |
| public static void task2() { | |
| int[][] matrix = new int[8][8]; | |
| int row, col, prevRow = 5, prevCol = 7, counter = 0; | |
| char cont; | |
| // boolean ok = false; | |
| // placing the horse | |
| matrix[prevRow][prevCol] = 1; | |
| printMatrix(matrix); | |
| // getting new position from user | |
| do { | |
| row = Io.promptInt("enter new row:"); | |
| col = Io.promptInt("enter new column:"); | |
| try { | |
| if (Math.abs(prevRow - row) == 2 && Math.abs(prevCol - col) == 1 || Math.abs(prevRow - row) == 1 && Math.abs(prevCol - col) == 2) { | |
| matrix[row][col] = 1; | |
| matrix[prevRow][prevCol] = 0; | |
| prevRow = row; | |
| prevCol = col; | |
| } else { | |
| throw new Exception("illegal horse move."); | |
| } | |
| } | |
| catch (ArrayIndexOutOfBoundsException e1) { | |
| Io.print("HEY! The new points are not in the matrix, Neo."); | |
| counter++; | |
| } | |
| catch (Exception e2) { | |
| Io.print(e2.getMessage()); | |
| counter++; | |
| } | |
| finally { | |
| Io.print("horse position: row: " + prevRow + ", col:" + prevCol); | |
| printMatrix(matrix); | |
| } | |
| // end | |
| Io.print("do you wish to continue? [y/n]"); | |
| cont = Io.readChar(); | |
| } while (cont != 'n'); | |
| Io.print("amount of illegal movements: " + counter); | |
| } | |
| /* | |
| * example 4 | |
| */ | |
| public static void task3() { | |
| boolean negative, outOfBounds; | |
| int i, j, counter = 0, sum = 0; | |
| int[] a = new int[5]; | |
| for (i = 0; i < 5; i++) { | |
| for (j = 0; j < 6; j++) { | |
| negative = false; | |
| outOfBounds = false; | |
| try { | |
| Io.print(i + ": " + a[i]); | |
| if (a[i] < 0) | |
| throw new Exception("-"); | |
| } | |
| catch (ArrayIndexOutOfBoundsException e) { | |
| Io.print("error"); | |
| counter++; | |
| outOfBounds = true; | |
| } | |
| catch (Exception e2) { | |
| if (e2.getMessage() == "-") | |
| negative = true; | |
| } | |
| finally { | |
| if (!negative && !outOfBounds) | |
| sum += a[i]; | |
| } | |
| } | |
| } | |
| } | |
| /* | |
| * none-null counter | |
| */ | |
| public static void task4() { | |
| int counter = 0; | |
| Point[] points = new Point[5]; | |
| points[2] = new Point(4, 5); | |
| points[0] = new Point(0, 10); | |
| for (int i = 0; i < points.length; i++) { | |
| try { | |
| if (points[i] == null) | |
| throw new Exception("no pointer: " + i); | |
| else | |
| Io.print("there is a pointer for " + i); | |
| } | |
| catch (Exception e) { | |
| Io.print(e.getMessage()); | |
| counter++; | |
| } | |
| } | |
| Io.print("amount of none-null obejcts: " + (points.length - counter)); | |
| } | |
| public static void main(String[] args) { | |
| int choice; | |
| do { | |
| choice = Io.promptInt("enter your choice (1-4):"); | |
| } while (choice < 1 || choice > 4); | |
| switch(choice) { | |
| case 1: | |
| task1(); | |
| break; | |
| case 2: | |
| task2(); | |
| break; | |
| case 3: | |
| task3(); | |
| break; | |
| case 4: | |
| task4(); | |
| break; | |
| default: | |
| handleDefault(); | |
| break; | |
| } | |
| } | |
| } |
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