这是一个模拟简单的绘图程序，定义了基本图形shpe_t，点point_t，圆circle_t，让点和圆都具有基本图形的特点，但它们还有其它特性，可理解为面向对象中继承。。思想很好，可以领会领会-This is a simulation of a simple paint program, and defines the basic graphics shpe_t the the point point_t round circle_t, so that the point and the circle have the characteristics of the basic graphics, but they have other features, understood as the object-oriented inheritance.. Thinking well, you can understand understand...