Question

Open a new file in your text editor, and start a class that will demonstrate a working two-dimensional array: import java.util.Scanner; class TwoDimensionalArrayDemo { public static void main(String[] args) { 2. Declare a three-by-three array of integers. By default, the elements will all be initialized to 0. int[][] count = new int[3][3]; 3. Declare a Scanner object for input, variables to hold a row and column, and a constant that can be used to indicate when the user wants to quit the application. Scanner input = new Scanner(System.in); int row, column; final int QUIT = 99; 4. Prompt the user to enter a row or the QUIT value to quit, and then accept the user’s input. System.out.print("Enter a row or " + QUIT + " to quit > "); row = input.nextInt(); 5. In a loop that continues if the user has not entered the QUIT value, prompt the user for a column. If the row and column are both within appropriate ranges, add 1 to the element in the selected position. while(row != QUIT) { System.out.print("Enter a column > "); column = input.nextInt(); if(row < count.length && column < count[row].length) { count[row][column]++; 6. Still within the if statement that checks for a valid row and column, add a nested loop that displays each row and column of the newly incremented array. The elements in each row are displayed on the same line, and a new line is started at the end of each row. Add a closing curly brace for the if statement. for(int r = 0; r < count.length; ++r) { for(int c = 0; c < count[r].length; ++c) System.out.print(count[r][c] + " "); System.out.println(); } } 7. Add an else clause to the if statement to display an error message when the row or column value is too high. else System.out.println("Invalid position selected"); 8. At the end of the loop, prompt the user for the next row number, and then accept it. Add closing curly braces for the loop, the main() method, and the class. System.out.print("Enter a row or " + QUIT + " to quit > "); row = input.nextInt(); } } }. Save the file as TwoDimensionalArrayDemo.java. Compile and execute the program. Figure 9-14 shows a typical execution. As the user continues to enter row and column values, the appropriate elements in the array are incremented

Answer 1

ANSWER:-

CODE:-

import java.util.Scanner;
class TwoDimensionalArrayDemo {
   public static void main(String[] args) {
       int[][] count = new int[3][3];
       Scanner input = new Scanner(System.in);
       int row, column;
       final int QUIT = 99;
       System.out.print("Enter a row or " + QUIT + " to quit > ");
       row = input.nextInt();
       while(row != QUIT) {
          System.out.print("Enter a column > ");
          column = input.nextInt();
          if(row < count.length && column < count[row].length) {
              count[row][column]++;
              for(int r = 0; r < count.length; ++r) {
                  for(int c = 0; c < count[r].length; ++c)
                      System.out.print(count[r][c] + " ");
                  System.out.println();
              }
          }
          else System.out.println("Invalid position selected");
           System.out.print("Enter a row or " + QUIT + " to quit > ");
           row = input.nextInt();
       }
   }
}

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OUTPUT:-