Python编程6——Python实现Collatz
前言
这个是需要更多修改的部分。Python实现Collatz序列。 本来以为比较简单，但是看了看维基百科的说明，这个居然可以出现分形，顿时冋了。 这个还需要修改啊。
Collatz序列的定义
所谓的Collatz序列是这样的一种序列：
- 对于偶数，除以2
- 对于奇数，乘以3再加上1
最后直到结果为1时结束程序。
生成Collatz序列
#this is the generator of Collatz Sequece
#we use the programe to generate it
#the Collatz Sequece is the series that has the following character:
#if the number is even , divide it with 2
#if the number it odd, multilply it with 3 and add 1 to get the final result
#if we get 1, exit the programe
#waventropy
numStr=raw_input("Enter a postive number:")
num=int(numStr)
count=0
print "Start with number:",num
print "Sequece is:",
#the ending , is to set Python put the output of print in oneline
while num > 1:
if num%2:
num=num*3+1
else:
num=num/2
print num,",",
count+=1
else:
print
print "Sequece is",count,"number long"
Written on January 13, 2013