继承、多继承

    基类和派生类      c#

 Rectangle rect =new Rectangle();
 rect.SetWidth(5);
 rect.SetHeight(7);
 Report.Info("矩形面积:"+rect.getArea());
 class shape{
		
		public void SetWidth(int W){

			Width=W;
		}
		public void SetHeight(int H){
			
			Height=H;
		}
		 protected int Width;
		 protected int Height;
		}
	
	class Rectangle:shape{
		
		public int getArea(){
			return (Width*Height);
		}
	 }

多继承 c++

#include <iostream>

using namespace std;

class Shape {
public : 
	void SetHeight(int H) {

		Height = H;
	}
	void SetWidth(int W) {

		Width = W;
	}

protected:
	int Height;
	int Width;
};

class PointCost {

public:
	int GetAreaCost(int Area) {

		return (Area * 70);
	}
};

class Rectangle : public Shape, public PointCost {

public:
	int GrtArea() {

		return (Height*Width);
	}
};

int main(void) {

	Rectangle Rect;
	Rect.SetHeight(4);
	Rect.SetWidth(9);
	int Area = Rect.GrtArea();
	cout << "输出面积为:" << Rect.GrtArea() << endl;

	cout << "输出总费用为:" << Rect.GetAreaCost(Area) << endl;
	system("pause");

	return 0;
}