流程控制之while循环

#_*_coding:utf-8_*_

#课堂练习1
    # print('start....')
    # while True:
    #     name =input('Please enter your name:')
    #     pwd = input('please enter your pwd:')
    #     if name == 'egon' and pwd == '123':
    #         print('login successful')
    #     else:
    #         print('user or pwd err')
    # print('end...')

    # print('start..')
    # tag = True
    # while tag:
    #     name = input('please your name>>:')
    #     pwd = input('Please your pwd>>:')
    #     if name == 'oOC' and pwd =='123':
    #         print('login successful')
    #         tag = False
    #     else:
    #         print('usr or pwd err')
    #
    # print('end..')

#课堂练习2 break 强行终止本层循环
    # count = 1
    # while count < 6:
    #     print(count)
    #     count+=1

    # count = 1
    # while True:
    #     if count > 5:
    #         break
    #     print(count)
    #     count += 1

    # print('star...')  #输入错误一直输
    # while True:
    #     name = input('Please your name>>:')
    #     pwd = input('Please your password>>:')
    #     if name == 'oOC' and pwd == '123':
    #         print('login successful')
    #         break
    #     else:
    #         print('usr or pwd err')
    #
    # print('end ...')


    # print('star...')
    # count = 0
    # while True:
    #     if count == 3 :
    #         print('输错次数太多')
    #         break
    #     name = input('Please your name>>:')
    #     pwd = input('Please your pwd>>:')
    #
    #     if name == 'egon' and pwd == '123':
    #         print('login successful')
    #         break
    #     else:
    #         print('user or pwd err')
    #         count +=1
    # print('end...')


#打印0-10
    # count = 0
    # while count <= 10:
    #     print('loop',count)
    #     count +=1

#打印0-10之间的偶数
    # count = 0
    # while count <= 10:
    #     if count%2 == 0:
    #         print('loop',count)
    #     count += 1

#打印0-10之间的奇数
    # count = 0
    # while count <= 9:
    #     if count%2 ==1:
    #         print('loop',count)
    #     count +=1

#死循环
    # import time
    # num = 0
    # while True:
    #     print('count', num)
    #     time.sleep(1)
    #     num+=1

#循环嵌套与tag
# name='egon'
# password='123'
#
# while True:
#     inp_name=input('用户名: ')
#     inp_pwd=input('密码: ')
#     if inp_name == name and inp_pwd == password:
#         while True:
#             cmd=input('>>: ')
#             if not cmd:     #cmd输入为假是 not cmd 为真 进行continue
#                 continue
#             if cmd == 'quit':
#                 break
#             print('run <%s>' %cmd)
#     else:
#         print('用户名或密码错误')
#         continue
#     break

#tag
# name='egon'
# password='123'
#
# tag=True
# while tag:
#     inp_name=input('用户名: ')
#     inp_pwd=input('密码: ')
#     if inp_name == name and inp_pwd == password:
#         while tag:
#             cmd=input('>>: ')
#             if not cmd:continue
#             if cmd == 'quit':
#                 tag=False
#                 continue
#             print('run <%s>' %cmd)
#     else:
#         print('用户名或密码错误')

#使用while循环输出1 2 3 4 5 6   8 9 10
    # count = 0
    # while count < 10:
    #     count += 1
    #     if count == 7:
    #         continue
    #     print(count)

#求1-100内的所有数的和
    # count = 1
    # sum = 0
    # while count <=100:
    #     sum = sum + count
    #     count += 1
    # print(sum)

#输出1- 100内的所有奇数
    # count = 1
    # while count < 100:
    #     if count % 2 == 1:
    #         print(count)
    #     count += 1

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

#求1-2+3-4+5 ... 99的所有数的和
    # tag = 1
    # count = 1
    # sum = 0
    # while count <= 99:
    #     sum = sum + tag * count
    #     tag *= -1
    #     count += 1
    # print(sum)

#用户登陆（三次机会重试）
    # name = 'oOC'
    # password = '123'
    # count = 1
    # while count <= 3:
    #     in_name=input('Please enter your name:')
    #     in_pass=input('Please enter your password:')
    #
    #     if in_name == name and in_pass == password:
    #         print('login success')
    #         break
    #
    #     print('username or password is not correct!')
    #     count += 1


    # name = 'oOC'
    # password = '123'
    # count = 1
    # tag = True
    # while tag:
    #     if count <= 3:
    #         in_name = input('Please enter your name:')
    #         in_pass=input('Please enter your password:')
    #         if in_name == name and in_pass == password:
    #             print('login success')
    #             break
    #         else:
    #             print('username or password is not correct!')
    #             count += 1
    #     else:
    #         print('login failed!')
    #         tag = False

#猜年龄
    # num = 31
    #
    # count = 1
    # while count <= 3:
    #     guess_num = input('Please enter the num:')
    #     guess_num = int(guess_num)
    #     if guess_num == num:
    #         print('Correct!')
    #         break
    #     else:
    #         print('Wrong！Please try again!')
    #     count += 1
    # else:
    #     print('foolish!')

#猜年龄升级版
    # num = 31
    # count = 1
    #
    # while count < 4:
    #     guess_num = input('Please enter the num:')
    #     guess_num = int(guess_num)
    #     count +=1
    #     if guess_num == num:
    #         print('Correct!')
    #         break
    #     elif count == 4:
    #         tag = input('Could u play the game again?[Y/N]')
    #         if tag == 'Y':
    #             count = 1
    #         else:
    #             break
    #     else:
    #         print('Wrong！Please try again!')