Day3：#求1-2+3-4+5 ... 99的所有数的和，88除外

1、#求1-2+3-4+5 ... 99的所有数的和，88除外

i = 0
sum = 0

while i < 100:
    if i == 88:
        i = i + 1
        continue
    elif i % 2 == 0:
        sum = sum - i
        i = i + 1
    else:
        sum = sum + i
        i = i + 1
print(sum)