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Mirror Image Matrix Program - Java Program

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

Java


import java.io.*;
class Mirror{
    public static void main(String args[])throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.print("m = ");
        int m = Integer.parseInt(br.readLine());
        if(m < 3 || m > 19){
            System.out.println("SIZE OUT OF RANGE");
            return;
        }

        int a[][] = new int[m][m];
        int b[][] = new int[m][m];
        int p = 0;
        int q = m - 1;
        System.out.println("Enter matrix elements:");
        for(int i = 0; i < m; i++){
            q = m - 1;
            for(int j = 0; j < m; j++){
                a[i][j] = Integer.parseInt(br.readLine());
                b[p][q] = a[i][j];
                q--;
            }
            p++;
        }

        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();
        }
        System.out.println("MIRROR IMAGE MATRIX");
        for(int i = 0; i < m; i++){
            for(int j = 0; j < m; j++){
                System.out.print(b[i][j] + "\t");
            }
            System.out.println();
        }
    }
}

Output

 
OUTPUT 1:

m = 3
Enter matrix elements:
1
2
3
4
5
6
7
8
9
ORIGINAL MATRIX
1   2   3   
4   5   6   
7   8   9   
MIRROR IMAGE MATRIX
3   2   1   
6   5   4   
9   8   7   

OUTPUT 2:
m = 3
Enter matrix elements:
4
16
12
8
2
14
6
1
3
ORIGINAL MATRIX
4   16  12  
8   2   14  
6   1   3   
MIRROR IMAGE MATRIX
12  16  4   
14  2   8   
3   1   6