求100到200之间所有的偶数和 (while循环和for循环各自实现一遍)

while循环

a = 100

b = 0

while a <= 200:

if a % 2 == 0:

b += a

a += 1

print('100-200中所有的偶数和为%d' % b)

for循环

b = 0

for i in range(100,201):

if i % 2 == 0:

b += i

print('100-200中所有的偶数和为%d' % b)