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。

tu1

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"

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