Question

A class Matrix contains a two dimensional integer array of order [m x n].The maximum value possible for both ‘m’ and ‘n’ is 25 . Design a class Matrix to find the difference of the two matrices . The details of the members of the class are given below:

Classname:Matrix
Data members/ instance variables:
arr[ ][ ]:stores the matrix element
m:integer to store the number of rows
n:integer to store the number of columns

Member functions:
Matrix(int mm,int nn): to initialize the size of the matrix m=mm and n=nn
void fillarray():to enter the elements of the matrix
Matrix SubMat(Matrix A):subtract the current object from the matrix of parameterized object and return the resulting object

void display():display the matrix elements

Specify the class Matrix giving details of the constructor(int,int ). void fillarray() ,Matrix SubMat(Matrix) and void display() . Also define a main() function to create an object and call the methods accordingly to enable the task.

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Code

				
					import java.util.Scanner;
public class Matrix
{
    Scanner sc=new Scanner(System.in);
    int arr[][];
    int m,n;
    Matrix(int mm,int nn)
    { 
        m=mm;
        n=nn;
        arr=new int[m][n];
    }
    
    void fillarray()
    {
        
        for(int i=0;i< m;i++)
        {
            for(int j=0;j< n;j++)
            {
                arr[i][j]=sc.nextInt();
            }
        }
    }

    Matrix SubMat(Matrix A)
    {
        Matrix B=new Matrix(m,n);
        for(int i=0;i< m;i++)
        {
            for(int j=0;j< n;j++)
            {
                B.arr[i][j]=A.arr[i][j]-arr[i][j] ;
            }
        }
        return B;
    }

    void display()
    {
        for(int i=0;i< m;i++)
        { 
            System.out.println();
            
            for(int j=0;j< n;j++)
            System.out.print(arr[i][j]+"\t");
        }	
    }

    public static void main()
    { 
        Scanner sc1=new Scanner(System.in);
        System.out.println("Size of array:");
        int x=sc1.nextInt();
        
        int y=sc1.nextInt();
        if(x>25 ||y>25)
        {
           System.out.println("Invalid Size" );
        }
        else
        {
            Matrix P=new Matrix(x,y);
            Matrix Q=new Matrix(x,y);
            Matrix R=new Matrix(x,y);
            System.out.println("ENTER ELEMENTS IN MATRIX P");
            P.fillarray();
            System.out.println("ENTER ELEMENTS IN MATRIX Q");
            Q.fillarray();
            System.out.println("MATRIX P - MATRIX Q");
            R=Q.SubMat(P);
            R.display(); 
        }
        
    }
}