radius side width, height

readFigure	readFigure	readFigure
computeArea	computeArea	computeArea
computePerim	computePerim	computePerim
displayFig	displayFig	displayFig

Inheritance: The classes circle, square, and rectangle are derived from the class figure.

A polymorphic variable: The pointer variable myFig in the main function of the file figureTest.cpp can point to objects of the classes circle, square, or rectangle.

Polymorphism and dynamic binding of methods: The methods associated with the classes circle, square, or rectangle can all be invoked through myFig dynamically. When the object currently pointed to by myFig is of a specific class, the methods associated with that specific class are invoked.

Adtvantage of polymorphism and dynamic binding: contrasting with a program that processes graphic objects from the three classes circle, square, or rectangle, but deal with them as three independent classes.