定义一个点类，在此基础上派生圆类、球类、椭圆类、椭球体、圆柱体, 圆锥体；长方形，正方形，正方体，正方体。要求：计算各类形状的面积，表面积，体积。-Define a point class, on this basis, derived round classes, ball, oval classes, spheroidal, cylinder, cone　rectangular, square, cube, cube. Requirements: calculate the area of all kinds of shapes, surface area, volume.