1-2+3-4...+99

n = 1
s = 0
while n < 100:
    temp = n % 2
    if temp == 0:
         s = s - n
    else:
         s = s + n
    n = n + 1
print(s)

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转载自www.cnblogs.com/wangzhiy/p/10207404.html