Program 6 BCA Madras University BCA Object Oriented Programming using C++ Practical Madras University Program 6 Design a 3x3 matrix class and demonstrate the following: a. Addition and multiplication of two matrices using operator overloading b. Maintaining a count of the number of matrix object created

 

BCA

Object Oriented Programming using C++ Practical

Madras University 

Program 6

Design a 3x3 matrix class and demonstrate the following: 

a. Addition and multiplication of two matrices using operator overloading 

b. Maintaining a count of the number of matrix object created.

SOURCE CODE:

#include <iostream>

using namespace std;

class Matrix3x3 {

private:

    int data[3][3];

    static int objectCount; // Static variable to count the number of objects

public:

    // Constructor to initialize the matrix

    Matrix3x3(int init[3][3]) {

        for (int i = 0; i < 3; ++i) {

            for (int j = 0; j < 3; ++j) {

                data[i][j] = init[i][j];

            }

        }

        objectCount++;

    }

    // Default constructor

    Matrix3x3() {

        for (int i = 0; i < 3; ++i) {

            for (int j = 0; j < 3; ++j) {

                data[i][j] = 0;

            }

        }

        objectCount++;

    }

    // Destructor

    ~Matrix3x3() {

        objectCount--;

    }

    // Static function to get the number of objects

    static int getObjectCount() {

        return objectCount;

    }

    // Operator overloading for matrix addition

    Matrix3x3 operator+(const Matrix3x3& other) const {

        Matrix3x3 result;

        for (int i = 0; i < 3; ++i) {

            for (int j = 0; j < 3; ++j) {

                result.data[i][j] = data[i][j] + other.data[i][j];

            }

        }

        return result;

    }

    // Operator overloading for matrix multiplication

    Matrix3x3 operator*(const Matrix3x3& other) const {

        Matrix3x3 result;

        for (int i = 0; i < 3; ++i) {

            for (int j = 0; j < 3; ++j) {

                result.data[i][j] = 0;

                for (int k = 0; k < 3; ++k) {

                    result.data[i][j] += data[i][k] * other.data[k][j];

                }

            }

        }

        return result;

    }

// Function to read matrix from user input

    void readFromUser() {

        cout << "Enter the elements of the 3x3 matrix (row-wise):" << endl;

        for (int i = 0; i < 3; ++i) {

            for (int j = 0; j < 3; ++j) {

                cin >> data[i][j];

            }

        }

    }

    // Function to print the matrix

    void print() const {

        for (int i = 0; i < 3; ++i) {

            for (int j = 0; j < 3; ++j) {

                cout << data[i][j] << " ";

            }

            cout << endl;

        }

    }

};

// Initialize static member

int Matrix3x3::objectCount = 0;

int main() {

    Matrix3x3 matrix1, matrix2;

    

    cout << "Enter matrix 1:" << endl;

    matrix1.readFromUser();

    cout << "Enter matrix 2:" << endl;

    matrix2.readFromUser();

    cout << "Matrix 1:" << endl;

    matrix1.print();

    cout << "Matrix 2:" << endl;

    matrix2.print();

    Matrix3x3 matrixSum = matrix1 + matrix2;

    cout << "Sum of Matrix 1 and Matrix 2:" << endl;

    matrixSum.print();

    Matrix3x3 matrixProduct = matrix1 * matrix2;

    cout << "Product of Matrix 1 and Matrix 2:" << endl;

    matrixProduct.print();

    cout << "Number of Matrix3x3 objects created: " << Matrix3x3::getObjectCount() << endl;

    return 0;

}

OUTPUT:

Enter matrix 1:

Enter the elements of the 3x3 matrix (row-wise):

1 2  3

4 5 6

3 6 7

Enter matrix 2:

Enter the elements of the 3x3 matrix (row-wise):

3 3 3

2 2 2

1 1 1

Matrix 1:

1 2 3

4 5 6

3 6 7

Matrix 2:

3 3 3

2 2 2

1 1 1

Sum of Matrix 1 and Matrix 2:

4 5 6

6 7 8

4 7 8

Product of Matrix 1 and Matrix 2:

10 10 10

28 28 28

28 28 28

Number of Matrix3x3 objects created: 4

Explanation

1. Matrix Class:

   • The readFromUser method is added to read matrix elements from the user.
   • The print method displays the matrix elements.
   • Other class members and methods remain unchanged.

2. Main Function:

   • Two Matrix3x3 objects (matrix1 and matrix2) are created using the default constructor.
   • The readFromUser method is called to read the elements of each matrix from the user.
   • The matrices are displayed using the print method.
   • Addition and multiplication of the matrices are demonstrated using the overloaded operators.
   • The count of matrix objects is displayed using the static member function getObjectCount.