According to " lying Design Patterns" written with C++ console calculator program, a simple factory design pattern. Create addition and subtraction multiplication and division operation classes, inheritance, classes in basic computing operate, simple factory class used to instantiate the symbolic objects op.

compute_sipf\Add.cpp
............\client.cpp
............\compute_sipf.dsp
............\compute_sipf.dsw
............\compute_sipf.ncb
............\compute_sipf.opt
............\compute_sipf.plg
............\Debug\Add.obj
............\.....\client.obj
............\.....\compute_sipf.exe
............\.....\compute_sipf.ilk
............\.....\compute_sipf.pch
............\.....\compute_sipf.pdb
............\.....\Div.obj
............\.....\Mul.obj
............\.....\Operate.obj
............\.....\OperationSimpleFact.obj
............\.....\Sub.obj
............\.....\test.obj
............\.....\vc60.idb
............\.....\vc60.pdb
............\Div.cpp
............\head.h
............\Mul.cpp
............\Operate.cpp
............\OperationSimpleFact.cpp
............\Sub.cpp
............\test.cpp
............\Debug
compute_sipf

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