Requirements of the surface area of 挠甀戀攀, sphere, cylinder, you can abstract out a common base class Container is an abstract class, in which the definition of a public data member radius (this data can be used as the side of a square radius of the sphere, cylinder underside radius ), and seek the surface area of 瀠甀爀攀 virtual function area (). This abstract class derived to describe the three classes, the use of base class pointers and virtual functions, respectively, to calculate the surface area of 琠栀攀 three graphics.

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