C++入门实例，对继承与组合的初步应用。可以让用户选择在指定位置打印出不同的图形，如正立等腰三角形，倒立等腰三角形，矩形，正方形、菱形和多边形。图形由随机选择的*或者＃组成。 　　请为每种图形设计一个类，这些类之间的关系可能是继承或者组合。

 　　每个类需要能保存该图形对象的参数，改变参数的方法以及在屏幕上用字符打印该图形的方法。

 　　程序根据用户的选择产生一个新图形的对象，为该对象设置参数并打印。

-C++ Getting Started example, inheritance and composition of the initial application. Allows users to choose to print a different location in the specified graphics, such as the isosceles triangle is established, inverted isosceles triangle, rectangle, square, diamond and polygon. Graphics by the random selection of* or# form. 　Please design a class for each graph, the relationship between these classes may be inherited or a combination. 　Each class needs to save the graphic object parameter, change the parameters of the method and the use of characters on the screen to print the graphic method. 　selection process based on user create a new graphic object, set the parameters for the object and print.