#include "mysqrt.h"

using namespace std;
double mysqrt(double x)
{
    bool goodenough = false;
    double lastGuess, nextGuess;

    lastGuess = x / 10.0;

    if (x <= 0)
        return x;

    while (!goodenough) {
        
        nextGuess = (lastGuess + (x / lastGuess)) / 2.0;
        lastGuess = nextGuess;

        goodenough = abs(nextGuess - lastGuess) <= 0.000000000001;
    }
    return nextGuess;
}