Introduction - If you have any usage issues, please Google them yourself
To achieve the telephone number inquiry, each record is provided with the following data items: telephone number, user name and address;
2) enter each record from the keyboard, and establish the Hash list by phone number and user name respectively;
3) adopt a certain method to solve the conflict;
4) find and display a record of a given phone number;
5) find and display a record of a given user name.