BabbleDay's Blog
Happy Coding
递归和信用卡的Luhn算法
这里用python做一个mutual recursion
def split(n):
return n//10, n%10
def luhn_sum(n):
if n<10:
return n
else:
rest, last = split(n)
return luhn_double_sum(rest) + last
def luhn_double_sum(n):
rest, last = split(n)
luhn_digit = split(2*last)[0] + split(2*last)[1]
if n<10:
return luhn_digit
else:
rest, last = split(n)
return luhn_sum(rest) + luhn_digit
2023年1月23日 23:35
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2023年1月28日 04:44
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