Python实现1-2+3-4+5...+99 

1 sum = 0
2 count = 1
3 while count < 100:
4     if  count %2 ==0:
5         sum -= count
6     else:
7         sum += count
8     count = count + 1
9 print(sum)

 

posted @ 2018-07-17 21:17  长久安宁  阅读(5684)  评论(0)    收藏  举报