#include "MathFunctions.h"
#include "Table.h"
#include <cmath>
#include <iostream>

double mysqrt(double x)
{
#if defined(HAVE_LOG) && defined(HAVE_EXP)
    double result = exp(log(x) * 0.5);
    std::cout << "Computing Sqrt of " << x << " to be " << result
              << " using log and exp " << std::endl;
#else
    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;
    }

#endif

    return result;
}