為啥這樣結果不對呢
sum?=?0 x?=?1 n?=?1 while?True: ????if?n?>?20: ????????break ????n=n+1 ????x=x*2 ????sum=x+sum ???? print?sum
ApolloS
2015-04-21
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2015-04-21
每次循環后x值都遞增了。然后用sum累加x，當然有問題了。
sum = 0
x = 1
n = 1
while True:
??? if n > 20:
??????? break
??? if n==1 or n%2==0:
??????? sum += n
??? n = n + 1
print sum