练习题

#-*-coding:utf-8-*-
# a. 使用while循环实现输出2-3+4-5+6...+100 的和

# count = 0
# count2 = 2
# while count2 < 101:
#  if count2 % 2 == 0:
#     count += count2
#  else:
#     count -= count2
#  count2 += 1
# print(count)

# b. 使用 while 循环实现输出 1,2,3,4,5, 7,8,9, 11,12

# count = 0
# while count < 13:
#  count += 1
#  if count == 6 or count == 10:
#     pass
#  else:
#     print(count)

# c. 使用while 循环输出100-50，从大到小，如100，99，98...，到50时再从0循环输出到50，然后结束

# count = 100
# num = 0
# while True:
#  if count < 50:
#     print(num)
#     num += 1
#     if num > 50:
#        break
#  else:
#     print(count)
#  count -= 1

# d. 使用 while 循环实现输出 1-100 内的所有奇数

# count = 1
# while count < 101:
#  if count % 2 == 1:
#     print(count)
#  count += 1

# e. 使用 while 循环实现输出 1-100 内的所有偶数

# count = 1
# while count < 101:
#  if count % 2 == 0:
#     print(count)
#  count += 1