第十一周项目实践1————点-圆-圆柱类族设计

问题及代码：

/*copyright(c)2016.烟台大学计算机学院
 * All rights reserved,
 * 文件名称：text.Cpp
 * 作者：吴敬超
 * 完成日期：2016年5月4日
 * 版本号：codeblock
 *
 * 问题描述:  点-圆-圆柱类族设计
 * 输入描述:
 * 程序输出： 输出结果
 */
#include<iostream>
using namespace std;
class Point
{
public:
    Point(double x=0,double y=0);
    double getX()
    {
        return x;
    }
    double getY()
    {
        return y;
    }
    void setPoint(double,double);
    void show();
protected:
    double x;
    double y;
};
Point::Point(double x,double y)
{
    this->x=x;
    this->y=y;
}
void Point::setPoint(double x,double y)
{
    this->x=x;
    this->y=y;
}
void Point::show()
{
    cout<<"该点坐标为"<<x<<","<<y<<endl;
}
class Circle:public Point
{
public:
    Circle(double a=0,double b=0,double r=0);
    void setRadius(double);
    void show();
    double getRadius( ) const
    {
        return rd;
    }
    double area()const;
protected:
    double rd;
};
Circle::Circle(double a,double b,double r):Point(a,b),rd(r){}
void Circle::setRadius(double r)
{
    rd=r;
}
double Circle::area()const
{
    return 3.14*rd*rd;
}
void Circle::show()
{
    cout<<"圆的面积为的"<<area()<<endl;
}
class Cylinder:public Circle
{
public:
    Cylinder(double a=0,double b=0,double r=0,double he=0);
    void setHeight(double);
    double area()const;
    void show()const;
    double volume()const;
    double getH()const
    {
        return h;
    }
private:
    double h;
};
Cylinder::Cylinder(double a,double b,double r,double he):Circle(a,b,r),h(he){}
double Cylinder::area()const
{
    return 2*Circle::area()+2*3.14*rd*h;
}
void Cylinder::setHeight(double h)
{
    this->h=h;
}
double Cylinder::volume()const
{
    return 3.14*rd*rd*h;
}
void Cylinder::show()const
{
    cout<<"圆柱体的面积为"<<area()<<endl;
    cout<<"圆柱的体积为"<<volume()<<endl;
}
int main()
{
    Cylinder cy1(3.5,6.4,5.2,10);
    cout<<"\noriginal cylinder:\nx=";
    cy1.show();
    cy1.setHeight(15);
    cy1.setRadius(7.5);
    cy1.setPoint(5,5);
    cout<<"\nnew cylinder:\n";
    cy1.show();
    return 0;
}

运行结果：

学习心得：

通过本次练习我理解了派生类构造函数的意义及运用，能够熟练掌握派生类的运用