【例7.1】定义父类PONT和子类CIRCLE的绘图函数成员show #include <iostream.h> class POINT{ int x,y; public: int getx(){return x; int gety(){return y; virtual void show(){cout<<"Show a pointin"; POINT(int x,int y){POINT:x=x;POINT:y=y;} }； class CIRCLE:public POINT int r; public: int getr()return r; void show(){cout<<"Show a circleln";} CIRCLE(int x,int y,int r):POINT(x,y){CIRCLE::r=r; Return定义 88 【例7.1】定义父类POINT 和子类CIRCLE 的绘图函数成员 的绘图函数成员show #include <iostream.h> class POINT{ int x, y; public: int getx( ) { return x; } int gety( ) { return y; } virtual void show( ) { cout<<"Show a point\n"; } POINT(int x, int y) { POINT::x=x; POINT::y=y; } }; class CIRCLE: public POINT{ int r; public: int getr( ) { return r; } void show( ) { cout<<"Show a circle\n"; } CIRCLE(int x, int y, int r):POINT(x, y) { CIRCLE::r=r; } }; Return定义