编写一个名为collatz()的函数，它有一个名为number的参数。如果参数是偶数，那么collatz()就打印出number//2，并返回该值。如果number是奇数，collatz()就打印并返回3*number+1。然后编写一个程序，让用户输入一个整数，并不断对这个数调用collatz(),直到函数返回值1
错误解答：
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def collatz(number):
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#global number
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if number==1:
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number=1
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return number
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elif number%2==0:
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number=number//2
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print(number)
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collatz(number)
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else:
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number=3*number+1
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print(number)
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collatz(number)
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print('Please enter a number what you want:')
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while True:
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try:
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number=int(input())
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number=collatz(number)
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print(number)
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if number==1:
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break
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except ValueError:
- print('You must enter a integer')
正确解答：
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def collatz(number):
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if number==1:
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number=1
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return number
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elif number%2==0:
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number=number//2
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print(number)
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return collatz(number)
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else:
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number=3*number+1
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print(number)
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return collatz(number)
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print('Please enter a number what you want:')
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while True:
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try:
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number=int(input())
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number=collatz(number)
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print('Not in function: %d' % number)
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if number==1:
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break
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except ValueError:
- print('You must enter a integer')
要正确理解递归的概念。