7-6 三个出口

1. 项目

7-5 电影票

有家电影院根据观众的年龄收取不同的票价：不到 3 岁的观众免费；
3~12 岁的观众为 10 美元；超过 12 岁的观众为 15 美元。请编写一个循环，在其中询问
用户的年龄，并指出其票价。

以另一种方式完成练习 7-4 或练习 7-5，在程序中采取如下所有做法。
 在 while 循环中使用条件测试来结束循环。
 使用变量 active 来控制循环结束的时机。
 使用 break 语句在用户输入'quit'时退出循环。

 

2. 代码

age = ""
prompt = "Hello, How old are you?"
#在 while 循环中使用条件测试来结束循环
while age != 'quit':
    age = input(prompt)
    if age != 'quit':
        age = int(age)
        if age <= 3:
            ticket_fee = 0
            print("You are free for watch movie...\n")
        elif age > 3 and age <= 12:
            ticket_fee = 10
            print("You should pay " + str(ticket_fee) + "$ to watch movie.\n")
        elif age > 12:
            ticket_fee = 15
            print("You should pay " + str(ticket_fee) + "$ to watch movie.\n")

　　

age = ""
# 使用变量 active 来控制循环结束的时机
active = True
prompt = "Hello, How old are you?"

while active:
    age = input(prompt)
    if age == 'quit':
        active = False
    else:
        age = int(age)
        if age <= 3:
            ticket_fee = 0
            print("You are free for watch movie...\n")
        elif age > 3 and age <= 12:
            ticket_fee = 10
            print("You should pay " + str(ticket_fee) + "$ to watch movie.\n")
        elif age > 12:
            ticket_fee = 15
            print("You should pay " + str(ticket_fee) + "$ to watch movie.\n")

　　

age = ""
prompt = "Hello, How old are you?"
while True:
    age = input(prompt)
    if age == 'quit':
        # 使用 break 语句在用户输入'quit'时退出循环
        break
    else:
        age = int(age)
        if age <= 3:
            ticket_fee = 0
            print("You are free for watch movie...\n")
        elif age > 3 and age <= 12:
            ticket_fee = 10
            print("You should pay " + str(ticket_fee) + "$ to watch movie.\n")
        elif age > 12:
            ticket_fee = 15
            print("You should pay " + str(ticket_fee) + "$ to watch movie.\n")

 

3. 执行结果

D:\python编程：从入门到实践\venv\Scripts\python.exe "D:/python编程：从入门到实践/第7章 用户输入和while循环/parrot.py"
_______________________________3rd_________________________________
Hello, How old are you?1
You are free for watch movie...

Hello, How old are you?33
You should pay 15$ to watch movie.

Hello, How old are you?quit

Process finished with exit code 0