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The Media store system A media store contains a da...

The Media store system A media store contains a database of the media files. There are two types of media files: image files and audio files. Each medial file has a name and a unique code. In addition: The information for an Image file includes the author and format. The information for an audio file includes the duration of the audio file in seconds and the performer. 　 Assume that each media file are identified by a unique code. The system provides the following functions: Adds the specified media file to the media database. Look up a media file given a unique code. Removes the specified media file from the media database. Get the number of the media file that the media database contains

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