有C++ 编写的空间向量的所有计算，如四则运算，内积外积等-C prepared by the space vector of all, as four operations, the plot within the plot, such as outside

2D、3D、4D向量类，包含操作符重载 -2D, 3D, 4D vector class includes operator overloading，class CVector2,class CVector3,class CVector4