1 count = 1 2 sum = 0 3 4 while count < 100: 5 if count%2 == 0: 6 sum = sum - count 7 count = count + 1 8 else: 9 sum = sum + count 10 count = count + 1 11 print(sum)
1-2+3-4+5.....+99=?
原文：https://www.cnblogs.com/smps/p/14746034.html
