matice

#include <iostream>

int main()
{
    int m_1, n_1, m_2, n_2; // m -> radek  n -> sloupec
    std::cout << "Nasobeni matic A x B" << std::endl;
    std::cout << "Pocet radku matice A:" << std::endl;
    std::cin >> m_1;
    std::cout << "Pocet sloupcu matice A:" << std::endl;
    std::cin >> n_1;
    std::cout << "Pocet radku matice B:" << std::endl;
    std::cin >> m_2;
    std::cout << "Pocet sloupcu matice B:" << std::endl;
    std::cin >> n_2;
    if (n_1 != m_2)
    {
        std::cout << "Nasobeni matic neni definovan" << std::endl;
        return 1;
    }
    int matrix_A[m_1][n_1];
    int matrix_B[m_2][n_2];
    int matrix_C[m_1][n_2];
    std::cout << "Prvky matice A:" << std::endl;
    for (int i = 0; i < m_1; i++)
    {
        for (int j = 0; j < n_1; j++)
        {
            std::cin >> matrix_A[i][j];
        }
    }
    std::cout << "Prvky matice B:" << std::endl;
    for (int i = 0; i < m_2; i++)
    {
        for (int j = 0; j < n_2; j++)
        {
            std::cin >> matrix_B[i][j];
        }
    }
    for (int i = 0; i < m_1; i++)
    {
        for (int j = 0; j < n_2; j++)
        {
            int number = 0;
            for (int k = 0; k < n_1; k++)
            {
                number = number + matrix_A[i][k] * matrix_B[k][j];
            }
            matrix_C[i][j] = number;
        }
    }
    std::cout << "Matice C:" << std::endl;
    for (int i = 0; i < m_1; i++)
    {
        for (int j = 0; j < n_2; j++)
        {
            std::cout << matrix_C[i][j] << " ";
        }
        std::cout << std::endl;
    }
    return 0;
}