public BigDecimal Get(BigDecimal n)
{
if(n.CompareTo(ZERO) <= 0) {
throw new System.ArgumentException();
}
BigDecimal initialGuess = GetInitialApproximation(n);
BigDecimal lastGuess = ZERO;
BigDecimal guess = new BigDecimal(initialGuess.ToString());
int iterations = 0;
bool more = true;
while(more) {
lastGuess = guess;
guess = n.divide(guess, scale, BigDecimal.ROUND_HALF_UP);
guess = guess.add(lastGuess);
guess = guess.divide(TWO, scale, BigDecimal.ROUND_HALF_UP);
error = n.subtract(guess.multiply(guess));
if(++iterations >= maxIterations) {
more = false;
} else if(lastGuess.Equals(guess)) {
more = error.abs().CompareTo(ONE) >= 0;
}
}
return guess;
}