求平方根的算法

这种方法也叫巴比伦算法

python代码如下

import mathnum = int(raw_input("input your number:"))tolerance = float(raw_input('input your tolerance:'))guess = num / 2.0while math.fabs(guess ** 2  - num) > tolerance:    guess = (guess + (num / guess)) / 2.0print 'sqrt of',num,'is',guess