求1-2+3-4+5 ... 99的所有数的和

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

 

转载于:https://www.cnblogs.com/seperinna/p/9506605.html