Description: Small programs should have the following functions:
1. Registration. Registration of each student's Internet card number, deposit (> =5 RMB) and Internet time.
Query. You can check the online time of each card number, the time of the Internet, the deposit and the current fee.
Check out. According to the card number can calculate receivable amount, should seek amount.
4. Reminders. When an online card number of an Internet card? = it should be alerted to the deposit.
5. Renewal. When an online card number of an Internet card? = its deposit, he can hand in a certain amount of deposit (> = 5 RMB).
6. Modified rates. The rate of Internet connection should be adjusted. The default rate is 1 RMB /1 hour.
In order to avoid the loss of the machine room, it should be such a charging mode: pay first and then surf the Internet. If you go to the pentagon, you'll get the pentagon for half an hour.
General ledger. One day the administrator should know how much RMB he earned on this day.
You need to consider the unexpected end of the program.
If your program is timed by system time, you should also consider the special case where the system time is accidentally changed. In summary, you should consider the special circumstances that will make your program not work properly.
If you don't know how to clock, you can learn to use < Time. H> In the function.
Description:
A. Suppose there are 150 machines in the machine room.
B. Suppose the initial rate is 1 RMB /1 minute (for the convenience of testing).
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