//triangle.cpp #include<iostream> #include"triangle.h" using?namespace?std; Triangle::Triangle(int?x,int?y,int?a,int?b,int?m,int?n) { m_cA=new?Coordinate(x,y); m_cB=new?Coordinate(a,b); m_cC=new?Coordinate(m,n); } Triangle::Triangle() { cout<<"Triangle()"<<endl; } virtual?Triangle::~Triangle() { delete?m_cA; m_cA=NULL; delete?m_cB; m_cA=NULL; delete?m_cC; m_cA=NULL; cout<<"~Triangle()"<<endl; } //triangle.h #ifndef?TRIANGLE_H #define?TRIANGLE_H #include"coordinate.h" class?Triangle:public?Coordinate { public: Triangle(int?x,int?y,int?a,int?b,int?m,int?n); Triangle(); virtual~Triangle(); private: Coordinate?*m_cA; Coordinate?*m_cB; Coordinate?*m_cC; }; #endif //提示錯誤一個error?C2723:?'__dtor'?:?'virtual'?storage-class?specifier?illegal?on?function?definition