bluej Programs

2.Write a program to design a upside down Mirror Matrix.

import java.util.*;
class mirrormtrx_upsdn
{
    Scanner sc=new Scanner(System.in);
    int ar[][],br[][],m;
    void input()
    {
        System.out.println("Enter the size of the matrix:");
        m=sc.nextInt();
        if(m<=2 && m>=6)
        System.exit(0);
        ar=new int[m][m];
        br=new int[m][m];
        for(int i=0;i<m; i++)
        {
            System.out.println("Enter "+m+" number of elements of row"+i);
            for(int j=0;j<m;j++)
            {
                ar[i][j]=sc.nextInt();
            }
        }
    }
    void display()
    {
        for(int i=0;i<m;i++)
        {
            for(int j=0;j<m;j++)
            {
                System.out.print(ar[i][j]+" ");
            }
            System.out.println();
        }
    }
    void upside_down()
    {
        for(int i=0;i<m;i++)
        {
            for(int j=0;j<m;j++)
            {
                br[m-1-i][j]=ar[i][j];
            }
        }
        for(int i=0;i<m;i++)
        {
            for(int j=0;j<m;j++)
            {
                System.out.print(br[i][j]+" ");
            }
            System.out.println();
        }
    }
    void main()
    {
        mirrormtrx_upsdn obj=new mirrormtrx_upsdn();
        obj.input();
        System.out.println("Original array:");
        obj.display();
        System.out.println("Upside down matrix is:");
        obj.upside_down();
    }
}

Output:

Enter the size of the matrix:
5
Enter 5 number of elements of row0
34
87
12
10
11
Enter 5 number of elements of row1
22
33
44
55
66
Enter 5 number of elements of row2
99
98
97
67
56
Enter 5 number of elements of row3
32
13
42
53
63
Enter 5 number of elements of row4
14
53
36
76
87
Original array:
34 87 12 10 11 
22 33 44 55 66 
99 98 97 67 56 
32 13 42 53 63 
14 53 36 76 87 
Upside down matrix is:
14 53 36 76 87 
32 13 42 53 63 
99 98 97 67 56 
22 33 44 55 66 
34 87 12 10 11