1、Cylinder cy1(3.5,6.4,5.2,10); coutnoriginal cylinder:nx=cy1.getX(), y=cy1.getY(), r= cy1.getRadius(), h=cy1.getHeight()narea=cy1.area(), volume=cy1.volume()endl; cy1.setHeight(15); cy1.setRadius(7.5); cy1.setPoint(5,5);nnew cylinder:ncy1; Point &pRef=cy1;npRef as a point:pRef; Circle &cRef=cy1;ncRef
2、 as a Circle:cRef; return 0;3:解法一class Pointpublic: Point(float a,float b):x(a),y(b) Point()coutexecuting Point destructor private: float x; float y;class Circle:public Point Circle(float a,float b,float r):Point(a,b),radius(r) Circle()coutexecuting Circle destructor float radius;Point *p=new Circle
3、(2.5,1.8,4.5); delete p;3:解法二Circle(int a,int b,int r): Circle *pt=new Circle(2.5,1.8,4.5); delete pt;解法三 virtual Point()coutCircle(float a,float b,float r): virtual Circle()coutvoid main()4:/定义抽象基类Shapeclass Shape virtual double area() const =0; /纯虚函数/定义Circle类public ShapeCircle(double r):radius(r)
4、 /结构函数 virtual double area() const return 3.14159*radius*radius; /定义虚函数 protected: double radius; /半径/定义Rectangle类class Rectangle: Rectangle(double w,double h):width(w),height(h) /结构函数 virtual double area() const return width*height; /定义虚函数 double width,height; /宽与高class Triangle: Triangle(double w,
5、double h):width(w),height(h) /结构函数 virtual double area() const return 0.5*width*height; /定义虚函数 /宽与高/输出面积的函数void printArea(const Shape &s)couts.area() /输出s的面积 Circle circle(12.6); /建立Circle类对象circlearea of circle =; printArea(circle); /输出circle的面积 Rectangle rectangle(4.5,8.4); /建立Rectangle类对象rectangl
6、earea of rectangle = printArea(rectangle); /输出rectangle的面积 Triangle triangle(4.5,8.4); /建立Triangle类对象 area of triangle = printArea(triangle); /输出triangle的面积5: /纯虚函数/定义Circle(圆形)类/定义Square(正方形)类class Square: Square(double s):side(s) /结构函数 virtual double area() const return side*side; /定义虚函数 double side;/定义Rectangle(矩形)类/定义Trapezoid(梯形)类class Trapezoid: Trapezoid(double t,double b,double h):top(t),bottom(t),height(h)
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