NikitaLearn4.1.1

#include <iostream>

using namespace std;

class Matrix
{
public:
    Matrix(int countRow, int countCol)
    {
        this->countCol = countCol;
        this->countRow = countRow;

        arr = new double* [countRow];
        for (int i = 0; i < countRow; i++)
        {
            arr[i] = new double[countCol];
            //сразу обнуляем значения;
            for (int j = 0; j < countCol; j++)
            {
                arr[i][j] = 0;
            }
        }
    }

    double getElement(int rowIndex, int colIndex)
    {
        return arr[rowIndex][colIndex];
    }

    void setElement(int rowIndex, int colIndex, double value)
    {
        arr[rowIndex][colIndex] = value;
    }

    void printArr()
    {
        for (int i = 0; i < countRow; i++)
        {
            for (int j = 0; j < countCol; j++)
            {
                cout << arr[i][j] << "\t";
            }
            cout << endl;
        }
    }

    void addition(Matrix &arr2, Matrix &result) //сложние двух матриц (нету проверки на размерность)
    {
        double tmp;
        for (int i = 0; i < countRow; i++)
        {
            for (int j = 0; j < countCol; j++)
            {
                tmp = this->arr[i][j] + (arr2.getElement(i, j));
                result.setElement(i, j, tmp);
            }
        }
    }

    void multiplication(double num, Matrix& result)
    {
        double tmp;
        for (int i = 0; i < countRow; i++)
        {
            for (int j = 0; j < countCol; j++)
            {
                tmp = this->arr[i][j] * num;
                result.setElement(i, j, tmp);
            }
        }
    }

    ~Matrix()
    {
        for (int i = 0; i < countCol; i++)
        {
            delete[] this->arr[i];
        }
        cout << "Сработал деструктор" << endl;
    }

private:
    double** arr;
    int countRow;
    int countCol;
};

void setTestData1(Matrix& my_matrix1)
{
    int counter = 0;
    for (int i = 0; i < 3; i++)
    {
        for (int j = 0; j < 3; j++)
        {
            my_matrix1.setElement(i, j, counter);
            counter++;
        }
    }
}

void setTestData2(Matrix& my_matrix1)
{
    int counter = 99;
    for (int i = 0; i < 3; i++)
    {
        for (int j = 0; j < 3; j++)
        {
            my_matrix1.setElement(i, j, counter);
            counter--;
        }
    }
}

int main()
{
    setlocale(LC_ALL, "Ru");

    Matrix my_matrix1 = Matrix(3, 3);
    Matrix my_matrix2 = Matrix(3, 3);
    Matrix result = Matrix(3, 3);

    //delete[] my_matrix2;

    cout << "setTestData1(my_matrix1)-----------------------" << endl;
    setTestData1(my_matrix1);
    my_matrix1.printArr();

    /*cout << "setTestData1(my_matrix2)-----------------------" << endl;
    setTestData2(my_matrix2);
    my_matrix2.printArr();

    my_matrix1.addition(my_matrix2, result);
    cout << "setTestData1(my_matrix2)-----------------------" << endl;
    result.printArr();*/

    my_matrix1.multiplication(2, result);
    cout << "result.printArr()-----------------------" << endl;
    result.printArr();
}