Think_Python/ex_07_2.py at master · alexxa/Think_Python

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#!/usr/bin/python

#AUTHOR: alexxa

#DATE: 25.12.2013

#SOURCE: Think Python: How to Think Like a Computer Scientist by Allen B. Downey

# http://www.greenteapress.com/thinkpython/html/index.html

#PURPOSE: Chapter 7. Iteration

# Exercise 7.2

# Encapsulate this loop in a function called square_root that

# takes a as a parameter, chooses a reasonable value of x, and

# returns an estimate of the square root of a.

def square_root(a):

x = a

while True:

if x == 0:

return 0

y = (x + a/x) / 2

if y == x:

return y

x = y

print(square_root(0))

print(square_root(1))

print(square_root(2))

print(square_root(9))

print(square_root(225))

#END