03 求1-2+3-4...-98+99-100的和

 

sum = 0
start = 1
while True:
    if start%2 ==0:
        sum = sum - start
    else:
        sum = sum + start
    start = start + 1
    if start == 101:
        break
print(sum)

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原文地址：https://www.cnblogs.com/wssaried/p/9785590.html