design and test a rectangular called Rectangle category, its attributes to the lower left-hand corner of the rectangle with 2 points lower right coordinates, which calculates the rectangular area

4_9
...\4_9.cpp
...\4_9.dsp
...\4_9.dsw
...\4_9.ncb
...\4_9.opt
...\4_9.plg
...\ReadMe.txt
...\Rectangle.cpp
...\Rectangle.h
...\StdAfx.cpp
...\StdAfx.h

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