2018.9.14作业

# 格式化输出1-10
# i = 1
# while i <= 10:
#     if i == 7:
#         print('  ', end='')
#         i += 1
#     print('%d ' % i, end='')
#     i += 1

# 1-100求和
# i = 1
# sum = 0
# while i <= 100:
#     sum += i
#     i += 1
# print(sum)

# 输出1-100内所有奇数
# i = 1
# while i <= 100:
#     if i % 2 != 0:
#         print(i)
#     i += 1

# 输出1-100内所有偶数
# i = 1
# while i <= 100:
#     if i % 2 == 0:
#         print(i)
#     i += 1

# #求1-2+3-4+5...+99的和
# i = 1
# sum = 0
# while i <= 99:
#     if i % 2 == 0:
#         sum -= i
#     else:
#         sum += i
#     i += 1
# print(sum)

# #用户登录(三次机会重试)
# count = 3
# while count > 0:
#     name = input("请输入用户名：")
#     pwd = input("请输入密码：")
#     if name != pwd:
#         print("用户名或密码错误！", end='')
#         print("还剩%d次机会！" % (count-1))
#         count -= 1
#     else:
#         print("登录成功")
#         break
# else:
#     print("机会用完了，登录失败")

# 猜年龄小游戏，允许用户最多尝试3次，3次都没猜对的话，就直接退出，如果猜对了，打印恭喜信息并退出
# count = 3
# while count > 0:
#     age = 18
#     guess = input("请输入年龄：")
#     guess = int(guess)
#     if age == guess:
#         print("猜对了！")
#         break
#     elif guess > age:
#         print("猜大了")
#         count -= 1
#     else:
#         print("猜小了")
#         count -= 1
# else:
#     print("机会用完了...")

# 猜年龄游戏升级版
# 允许用户最多尝试3次
# 每尝试3次后，如果还没猜对，就问用户是否还想继续玩，如果回答Y或y，就继续让其猜3次，以此往复
# 如果回答N或n，就退出程序
# count = 3
# age = 18
# while count >= 0:
#     if count == 0:
#         tag = input("机会用完了，是否继续玩？y/n：")
#         if tag == 'Y' or tag == 'y':
#             count += 3
#             continue
#         elif tag == 'N' or tag == 'n':
#             print("即将退出程序")
#             break
#         else:
#             print("输入有误，请重新输入！")
#             continue
#     guess = input("请输入年龄：")
#     guess = int(guess)
#     if guess > age:
#         print("猜大了！")
#         count -= 1
#     elif guess < age:
#         print("猜小了！")
#         count -= 1
#     else:
#         print("恭喜，猜对了")
#         break