Question

Write a class named RowSort which has the following members. Private: (1) double matrix 0O (a 2D array): (2) int columns; (3) int rows Public: (1) A default constructor that creates a 2D array, 8 6 4 (2) A constructor that takes three values for the three private members, and creates a 2D array accordingly. (3) The "get" and "set" methods for the three private members. (4) A method that displays a 2D array, stored in the private member matrix, on the screen (5) A method that sorts the rows in the private member matrix in the increasing order. .Step1 Call the default constructor of RowSort, and then call proper methods to sort rows as a matrix. Then, write a class that has main method. The main method does the following. and to display the matrix. Step 2 Ask the user to enter two positive integers for columns and rows respectively, and then ask the user to enter real numbers for matrix accordingly .Step 3 Call the other constructor of RowSort, and then call the methods in (5) and (4) to display the matrix with each row sorted.

Answer 1

Using JAVA, since no language has been mentioned.

import java.util.*;

class RowSort {
private double arr[][];
private int col, row;
// Default constructor
public RowSort() {
    // Initializing new array
    arr = new double[3][3];
    int i=0,j=0,k=9;
    for(i=0;i<3;i++)
      for(j=0;j<3;j++)
        arr[i][j] = k--;
    col = row = 3;
}

// constructor taking 3 values of the private members
public RowSort(double a[][], int b, int c) {
    row = b;
    col = c;
    arr = new double[row][col];
    int i,j;
    // Copying the array passed inside argument to original array
    for( i=0; i<row; i++)
      for( j=0; j<col; j++)
        arr[i][j] = a[i][j];
}

// Getter functions
public int getRow() {
    return row;
}
public int getCol() {
    return col;
}
public double[][] getArr() {
    return arr;
}

// Setter functions
public void setRow(int a) {
    row = a;
}
public void setCol(int a) {
    col = a;
}
public void setArr(double a[][]) {
    arr = a;
}

// Function for sorting each row of the array
public void sort() {
    int q,i,j;
    for(q=0;q<row;q++) {
      double temp = 0;
      // Bubble sort
      for(i=0; i < col; i++){
             for(j=1; j < (col-i); j++){
                      if(arr[q][j-1] > arr[q][j]){
                             //swap elements
                             temp = arr[q][j-1];
                             arr[q][j-1] = arr[q][j];
                             arr[q][j] = temp;
                     }
             }
      }
   }
}

// Displaying each element of the array.
public void display(){
    int i,j;
    for(i=0;i<row;i++) {
      for(j=0;j<col;j++)
        System.out.print(arr[i][j] + " ");
      System.out.println();
    }
}
public static void main(String[] args) {
    RowSort r = new RowSort();
    r.sort();
    r.display();
    int col, row, i, j;
    Scanner sc = new Scanner(System.in);
    System.out.println("Enter row: ");
    row = sc.nextInt();
    System.out.println("Enter column: ");
    col = sc.nextInt();
    double a[][] = new double[10][10];
    // Input the 2D array
    System.out.println("Enter the values of the matrix:");
    for(i=0;i<row;i++)
      for(j=0;j<col;j++)
        a[i][j] = sc.nextDouble();
    // Using the parameterized constructor
    RowSort r1 = new RowSort(a,row,col);
    r1.sort();
    r1.display();
}
}

OUTPUT:

7.0 8.0 9.0
4.0 5.0 6.0
1.0 2.0 3.0
Enter row:
2
Enter column:
4
Enter the values of the matrix:
1 3 2 8
3 0 1 9
1.0 2.0 3.0 8.0
0.0 1.0 3.0 9.0