double num1 = 3.12345678;
  std::cout << std::fixed << std::showpoint;
  std::cout << std::setprecision(8);
  std::cout << num1 << std::endl;


    for (int i = 1; i < 10; ++i) {
        for (int j = 1; j < 10; ++j) {
            std::cout << std::setw(3) << i * j << ' ';
        }
        std::cout << '\n';
    }