Question

Design a class MatRev to reverse each element of a matrix.

				
					72      371     5
12      6       426
5       123     94

Becomes

				
					27      173     5
21      6       624
5       321     49

Some of the members of the class are given below:

Class name:MatRev
Data members/instance variables:
arr[ ][ ]:to store integer elements
m:to store the number of rows

n:to store the number of columns

Member functions/methods:
MatRev(int mm, int nn):parameterised constructor to initialise the data members m = mm and n = nn

void fillarray( ):to enter elements in the array

int reverse(int x): returns the reverse of the number x
void revMat( MatRev P):reverses each element of the array of the parameterized object and stores it in the array of the current object

void show( ):displays the array elements in matrix form

Define the class MatRev giving details of the constructor( ), void fillarray( ), int reverse(int), void revMat(MatRev) and void show( ). Define the main( ) function to create objects and call the functions accordingly to enable the task.

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Code

				
					import java.util.Scanner;
public class MatRev
{
    int arr[][],m,n;
    Scanner sc=new Scanner(System.in);

    MatRev(int mm,int nn)
    {
        m=mm; 
        n=nn;
        arr=new int[m][n];
    }
    
    void fillarray()
    {
        System.out.println("ENTER ELEMENTS IN ARRAY");
        for(int i=0;i< m;i++)
        {
            for(int j=0 ;j< n;j++)
            {
                arr[i][j]=sc.nextInt();
            }
        }
    }
    
    int reverse(int x)
    {
        int rev=0, rem=0;
        while(x!=0)
        { 
            rem=x% 10;
            rev=rev*10 + rem;
            x=x/ 10;
        }
        return rev;
    }
    
    void revMat(MatRev P)
    { 
        for(int i=0;i< m;i++) 
        {
            for(int j=0 ;j< n;j++)
            {
                arr[i][j]=reverse(P.arr[i][j]);
            }
        }
    }
    
    void show()
    { 
        for(int i=0;i< m;i++)
        {
            for(int j=0 ;j< n;j++)  
            {
                System.out.print(arr[i][j] + "\t");
            }
            System.out.println();
        }
    }

    public static void main()
    { 
        Scanner sc1=new Scanner(System.in);
        System.out.println("ENTER NUMBER OF ROWS OF MATRIX");
        int row=sc1.nextInt();
        System.out.println("ENTER NUMBER OF COLUMNS OF MATRIX");
        int col=sc1.nextInt();
        MatRev ob1 = new MatRev(row,col);
        MatRev ob2=new MatRev(row,col);
        ob1.fillarray();
        System.out.println("Original Array");
        ob1.show();
        ob2.revMat(ob1);
        System.out.println(" Reverse array");
        ob2.show();
    }
}