square root of numbers

gistfile1.txt

def square_root (n,d) #number and error difference
	guess = n / 2.0  #half the guess since square root cant be more than half
	while (((guess *guess) - n).abs > d)
		guess = refine(guess, n)
	end
	puts guess
end

def refine (guess, n)
	guess = (guess + (n / guess)) / 2.0
end

square_root(9, 0.0000001)