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Waveform Audio File Format  |  1993-10-21  |  187.1 KB  |  1 channel  |  11,025 sample rate  |  17 seconds
Transcription: In this call to use class, the argument DP has the type pointer to derived 1. Use class is expecting a pointer to base 1 as an argument. So DP is automatically converted to a pointer to base 1.