#include <iostream>

#include "MathFunctions.h"

// include the generated table
#include "Table.h"

namespace mathfunctions
{
  namespace detail
  {
    // a hack square root calculation using simple operations
    double mysqrt(double x)
    {
      if (x <= 0)
      {
        return 0;
      }

      // use the table to help find an initial value
      double result = x;
      if (x >= 1 && x < 10)
      {
        std::cout << "Use the table to help find an initial value " << std::endl;
        result = sqrtTable[static_cast<int>(x)];
      }

      // do ten iterations
      for (int i = 0; i < 10; ++i)
      {
        if (result <= 0)
        {
          result = 0.1;
        }
        double delta = x - (result * result);
        result = result + 0.5 * delta / result;
        std::cout << "Computing sqrt of " << x << " to be " << result << std::endl;
      }

      return result;
    }
  } // namespace detail
} // namespace mathfunctions