class Cric{
public:
Cric(){};
Cric(int x,int y,int c){
cx=x;cy=y;bj=c;
};
Cric(){};
private:
int cx,cy;
int bj;
public:
void ShowM(){
cout<<"面積"<< 2*3.1415926*bj*bj<<endl;
};
};
class CricEx:public Cric{
public:
CricEx(){};
CricEx(){};
private:
int height;
public:
void ShowV(){
cout<<"體積:"<< 2*3.1415926*bj*bj*height<<endl;
};
};
.
請參考