public double Calculate()
{
double x1 = -1;
double x2 = 1;
double Precision = dane.GetPrecision();
do
{
x1 = x2;
x2 = x1 - dane.getFunctionInPointX(x1) / dane.getDerivativeInPoint(x1);
if (Math.Abs(x2 - x1) <= Precision)
{
break;
}
if (Math.Abs(dane.getFunctionInPointX(x1)) <= Precision)
{
break;
}
} while (true);
return(Math.Round(x2, 0));
}