练习

1、下列输出是什么

(1)

print(6 or 2 > 1)

6

(2)

print(0 or 5  > 4)

5

(3)

print(5 < 4 or 3)

3

(4)

print( 2 > 1 or 6 )

True

(5)

print(3 > 1 and 0 )

0

(6)

print( 0 and  3 > 1 )

0

2、计算1-2+3.....+99中除了88以外所有数总和

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

138

3、计算1-2+3.....+98-99中除了88以外所有数总和

num = 0
j = -1
sum = 0
while num < 100:
    num += 1
    if num == 88:
        continue
    else:
        j = -j
        sum = sum + num * j
print(sum)

50