不知道為什么程序報錯
#include<iostream>
#include<string>
using namespace std;
class Shape{
public:
Shape();
virtual ~Shape();
virtual double calcArea(){
? cout<<"Shape---calcArea()"<<endl;
? return 0;
}
};
Shape::Shape(){
? cout<<"Shape()"<<endl;
}
Shape::~Shape(){
? cout<<"~Shape()"<<endl;
}
class Circle:public Shape{
protected:
double r;
Coordinate *pCenter;
public:
Circle(double _r);
virtual ~Circle();
virtual double calcArea(){
? ?cout<<"Circle---calcArea()"<<endl;
? ?return 3.14*r*r;
}
};
Circle::Circle(double _r){
? ?r=_r;
? ?pCenter=new Coordinate(3,5);
? ?cout<<"Circle"<<endl;
}
Circle::~Circle(){
delete pCenter;
pCenter=NULL;
? ?cout<<"~Circle()"<<endl;
}
class Rect:public Shape{
protected:
? ?double width;
? ?double height;
public:
Rect(double _width,double _height);
virtual ~Rect();
? ? virtual double calcArea(){
? ?cout<<"Rect---calcArea()"<<endl;
? ?return width*height;
}
};
Rect::Rect(double _width,double _height){
? ?width=_width;
? ?height=_height;
? ?cout<<"Rect()"<<endl;
}
Rect::~Rect(){
? cout<<"~Rect()"<<endl;
}
class Coordiante{
private:
int x;
int y;
public:
Coordinate(int _x,int _y);
~Coordinate();
};
Coordinate(int _x,int _y){
? cout<<"Coordinate()"<<endl;
? x=_x;
? y=_y;
}
Coordinate::~Coordinate(){
? cout<<"~Coordinate()"<<endl;
}
int main(){
? Shape *shape1=new Rect(5,6);
? Shape *shape2=new Circle(5);
? shape1->calcArea();
? shape2->calcArea();
? delete shape1;
? shape1=NULL;
? delete shape2;
? shape2=NULL;
? return 0;
}
2018-09-19
Coordinate 要放在前面定義，這樣shape才能調(diào)用
定義Coordinate的構(gòu)造函數(shù)要寫成Coordinate::Coordinate(int _x, int _y)
你的class Coordinate打錯了