Function show_data

Exercises/NoModules/Chapter 09/Soln9_03.cpp:32–46

Outputs an array of double values

// Outputs an array of double values
void show_data(std::span<const double> data,
               std::string_view title, size_t width, size_t perLine)
{
  std::cout << title << std::endl;  // Display the title

  // Output the data values
  for (size_t i {}; i < data.size(); ++i)
  {
    // Display a data item (uses a dynamic field width: see Chapter 7)
    std::cout << std::format("{:{}.6g}", data[i], width); 
    if ((i + 1) % perLine == 0)     // Newline after perLine values
      std::cout << '\n';
  }
  std::cout << std::endl;
}

std::optional<double> smallest(std::span<const double> data)
{