Description: supermarket, sometimes necessary to preserve the purchaser's name, telephone number, address information, to facilitate door-to-door, ordering services. The telephone number directory with large data storage library, providing individual and organizational information, the telephone number of simple storage systems can be used to achieve C language, and these messages can be stored on disk documents. With the accession of new subscribers, some old subscribers and other subscribers to delete data changes, must regularly updated directory. In addition to add, delete, modify operations, but also for the existing data.
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