修改上面的程序，在显示结果完成之后附加询问'Doyouwanttocalculateagain (y/n)，如果回答'y'，则要求重新输入参数，如果回答'n'，程序退出(Do while 循环)。
Modify the above program such that it will ask for 'Do you want to calculate again (y/n), if you say 'y', it'll again ask the parameters. If 'n', it'll exit.
如果编写的是一个面向用户的应用程序，而且信息来自于用户输入，您需要通过一个简单的Web表单，要求用户重新输入他们的电子邮件地址。
If you write a customer-facing application and the information came through user input, you can even ask the user to re-enter their E-mail address using a simple Web form.
在您第一次重新登录到每台机器时，keychain将要求您输入密码短语。
The first time you log back in to each machine, keychain will prompt you for the passphrase.
不过，除非机器被重新启动，否则，以后再登录时，keychain将不再要求您重新输入密码短语。
However, keychain won't ask you to reenter the passphrase on subsequent login attempts unless the machine has been restarted.
但是，由于缺乏对于通讯录访问技术的了解，现在相当多的软件产品不是从通讯录中读取数据，而是要求用户重新进行信息输入。
But now many software productions require users to input information again and again instead of reading data from address book since the programmers are lack of the knowledge of access address book.
但是，由于缺乏对于通讯录访问技术的了解，现在相当多的软件产品不是从通讯录中读取数据，而是要求用户重新进行信息输入。
But now many software productions require users to input information again and again instead of reading data from address book since the programmers are lack of the knowledge of access address book.
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