Matrix Mirror Image ISC Computer Science 2013 Practical

Write a program to declare a square matrix a[][] of order (M × M) where 'M' is the number of rows and the number of columns such that M must be greater than 2 and less than 20.

Allow the user to input integers into this matrix. Display appropriate error message for an invalid input. Perform the following tasks:

(a) Display the input matrix.

(b) Create a mirror image of the inputted matrix.

(c) Display the mirror image matrix.

Test your program for the following data and some random data:

Example 1
INPUT: M = 3

4    16   12
8    2     14
6    1     3

OUTPUT:
ORIGINAL MATRIX

4    16   12
8    2     14
6    1     3

MIRROR IMAGE MATRIX

12   16   4
14   2     8
3     1     6

Example 2
INPUT: M = 22
OUTPUT: SIZE OUT OF RANGE

import java.util.Scanner;

class Mirror{

    public static void main(String[] args) {

        Scanner in = new Scanner(System.in);

        System.out.print("M = ");

        int m = Integer.parseInt(in.nextLine());

        if(m < 3 || m > 19){

            System.out.println("SIZE OUT OF RANGE");

            return;

        }

        int a[][] = new int[m][m];

        System.out.println("Enter matrix elements:");

        for(int i = 0; i < m; i++){

            for(int j = 0; j < m; j++){

                a[i][j] = Integer.parseInt(in.nextLine());

            }

        }

        System.out.println("ORIGINAL MATRIX");

        for(int i = 0; i < m; i++){

            for(int j = 0; j < m; j++)

                System.out.print(a[i][j] + "\t");

            System.out.println();

        }

        for(int i = 0; i < m; i++){

            for(int j = 0; j < m / 2; j++){

                int temp = a[i][j];

                a[i][j] = a[i][m - 1 - j];

                a[i][m - 1 - j] = temp;

            }

        }

        System.out.println("MIRROR IMAGE MATRIX");

        for(int i = 0; i < m; i++){

            for(int j = 0; j < m; j++)

                System.out.print(a[i][j] + "\t");

            System.out.println();

        }

    }

}