Lecture 142:- Let's Code C++ class for Diagonal matrix

Here's the C++ class implementation for a diagonal matrix:

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#include <iostream> class DiagonalMatrix { private:    int size;      // Size of the matrix    int* elements; // Array to store diagonal elements public:    // Constructor to create a diagonal matrix of given size    DiagonalMatrix(int n) {        size = n;        elements = new int[size];        for (int i = 0; i < size; i++) {            elements[i] = 0;        }    }    // Destructor to deallocate memory    ~DiagonalMatrix() {        delete[] elements;    }    // Function to set an element at (i, i) position in the diagonal matrix    void setElement(int i, int value) {        if (i >= 0 && i < size) {            elements[i] = value;        } else {            std::cout << "Invalid index. Element not set." << std::endl;        }    }    // Function to get an element from (i, i) position in the diagonal matrix    int getElement(int i) {        if (i >= 0 && i < size) {            return elements[i];        } else {            std::cout << "Invalid index. Returning 0." << std::endl;            return 0;        }    }    // Function to display the diagonal matrix    void displayDiagonalMatrix() {        std::cout << "Diagonal Matrix:" << std::endl;        for (int i = 0; i < size; i++) {            for (int j = 0; j < size; j++) {                if (i == j) {                    std::cout << elements[i] << " ";                } else {                    std::cout << "0 ";                }            }            std::cout << std::endl;        }    } }; int main() {    DiagonalMatrix matrix(4);    matrix.setElement(0, 5);    matrix.setElement(1, 7);    matrix.setElement(2, 3);    matrix.setElement(3, 9);    matrix.displayDiagonalMatrix();    return 0; }

This class provides similar functionality as mentioned in the previous example. It allows you to create a diagonal matrix of a specified size, set elements at the (i, i) positions, retrieve elements, and display the diagonal matrix.

Output:

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Diagonal Matrix: 5 0 0 0 0 7 0 0 0 0 3 0 0 0 0 9

With this C++ class, you can easily work with diagonal matrices, and you can adjust the matrix size or set elements based on your requirements.