fig5_9printf.txt

用三个类来研究类的继承！类Point、Circle、Cylinder

编译的命令为：
	C:\tmp>bcc32 fig5_9.cpp cylinder2.cpp circle2.cpp point2.cpp

X coodinate is 1.2
Y coodinate is 2.3
Radius is 2.5
Height is 5.7

The new location, radius, and height of cy1 are: 
Center=[2, 2]; Radius4.25; Height10.0
Area: 381.Volume: 567.

Cylinder printed as a point is: [2.00, 2.00]

Cylinder printed as a circle is: Center=[2.00, 2.00]; Radius=4.25
Area: 56.7