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Week 10 - task 3- from point to circle to cylinder

2022-06-29 05:46:00 【sxhelijian】

【 subject 】

（1） Create a Point( spot ) class , Contains data members x,y( Coordinates );

（2） With Point Base class , Derive a Circle( round ) class , Add data members ( radius );

（3） And then to Circle Class is the direct base class , Derive a Cylinder( Cylinder ) class , Add more data members ( high ).

Require programming , Design all kinds of basic member functions （ Include constructors 、 Destructor 、 Modify the common interface of data members and get data members 、 Overloaded operators for output “<<” Functions, etc ）, It can be used to deal with the above objects , Finally, the surface area of the cylinder is obtained 、 Volume and output .

（ Tips ： This task can be divided into three sub tasks, which are divided into several steps . The first class of the first class , Then declare the derived class , Step by step , Step by step debugging .—— This method can be applied to any project ）

【 analysis 】 The key is to understand the inheritance of each class and the relationship between different kinds of geometry . To describe a circle , The center and radius of the circle need to be pointed out , The center of the circle is a point . When we use Point Base class , Derive a Circle( round ) Class time （ Page 2 Requirements ）, Data members from the base class （ The description of the point ） As a description of the center of a circle , Just add data members describing radius . Same thing , With Circle Class is the direct base class , Derive a Cylinder( Cylinder ) Class time （ The second part of this topic is 3 Requirements ）, The circle described by the base class is the circular section of a cylinder , Only increase “ high ” Attribute is enough .

The following answer is in three steps , Seriously experience this idea of solving problems . When you are faced with a problem where you need to define multiple classes , Do it one by one , Test as you go . On the basis of rigorous analysis , When there is an inheritance relationship between classes , First implement the base class , Then implement the derived class .

【 Refer to the answer 】

One 、 To implement the base class Point Class and for testing main() function

#include <iostream>
using namespace std;
class Point
{
public:
	Point(double x=0,double y=0);					 // Constructors 
	void setPoint(double,double);                  // Set coordinate values 
	double getX( ) const {return x;}              // read x coordinate 
	double getY( ) const {return y;}              // read y coordinate 
	friend ostream & operator<<(ostream &,const Point &);// Overload operator “<<”
protected:										 // Protected members 
	double x,y;
};


//Point Constructor for 
Point::Point(double a,double b)	
{
	x=a;
	y=b;
}
// Set up x and y The coordinate values of 
void Point::setPoint(double a,double b)  
{
	x=a;
	y=b;
}

ostream & operator<<(ostream &output,const Point &p)
{
	output<<"["<<p.x<<","<<p.y<<"]"<<endl;
	return output;
}

int main( )
{
	Point p(3.5,6.4); 
	cout<<"x="<<p.getX( )<<",y="<<p.getY( )<<endl;  
	p.setPoint(8.5,6.8);                             
	cout<<"p:"<<p<<endl; 
	system("pause");
	return 0;
}

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Two 、 Implement derived classes Circle And its test functions

#include <iostream>
using namespace std;
class Point
{
public:
	Point(double x=0,double y=0);					 // Constructors 
	void setPoint(double,double);                  // Set coordinate values 
	double getX( ) const {return x;}              // read x coordinate 
	double getY( ) const {return y;}              // read y coordinate 
	friend ostream & operator<<(ostream &,const Point &);// Overload operator “<<”
protected:										 // Protected members 
	double x,y;
};


//Point Constructor for 
Point::Point(double a,double b)	
{
	x=a;
	y=b;
}
// Set up x and y The coordinate values of 
void Point::setPoint(double a,double b)  
{
	x=a;
	y=b;
}

ostream & operator<<(ostream &output,const Point &p)
{
	output<<"["<<p.x<<","<<p.y<<"]"<<endl;
	return output;
}

class Circle:public Point //circle yes Point A common derived class of class 
{
public:
	Circle(double x=0,double y=0,double r=0);  // Constructors 
	void setRadius(double);                  // Set the radius value 
	double getRadius( ) const;               // Read the radius value 
	double area ( ) const;                   // Calculate the area of the circle 
	friend ostream &operator<<(ostream &,const Circle &);// Overload operator “<<”
protected:
	double radius;
};

// Define the constructor , Initialize center coordinates and radius 
Circle::Circle(double a,double b,double r):Point(a,b),radius(r){ }

// Set the radius value 
void Circle::setRadius(double r)
{
	radius=r;
}

// Read the radius value 
double Circle::getRadius( ) const
{
	return radius;
}

// Calculate the area of the circle 
double Circle::area( ) const
{
	return 3.14159*radius*radius;
}

// Overload operator “<<”, Make it output the information of circle in the prescribed form 
ostream &operator<<(ostream &output,const Circle &c)
{
	output<<"Center=["<<c.x<<", "<<c.y<<"], r="<<c.radius<<", area="<<c.area( )<<endl;
	return output;
}

int main( )
{
	Circle c(3.5,6.4,5.2);
	cout<<"original circle:\nx="<<c.getX()<<", y="<<c.getY()<<", r="<<c.getRadius( ) <<", area="<<c.area( )<<endl;  
	c.setPoint(5,5);       
	cout<<"new circle:\n"<<c;     
	system("pause");
	return 0;
}

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3、 ... and 、 Realization Circle The derived class Cylinder And test functions

#include <iostream>
using namespace std;
class Point
{
public:
	Point(double x=0,double y=0);					 // Constructors 
	void setPoint(double,double);                  // Set coordinate values 
	double getX( ) const {return x;}              // read x coordinate 
	double getY( ) const {return y;}              // read y coordinate 
	friend ostream & operator<<(ostream &,const Point &);// Overload operator “<<”
protected:										 // Protected members 
	double x,y;
};


//Point Constructor for 
Point::Point(double a,double b)	
{
	x=a;
	y=b;
}
// Set up x and y The coordinate values of 
void Point::setPoint(double a,double b)  
{
	x=a;
	y=b;
}

ostream & operator<<(ostream &output,const Point &p)
{
	output<<"["<<p.x<<","<<p.y<<"]"<<endl;
	return output;
}

class Circle:public Point //circle yes Point A common derived class of class 
{
public:
	Circle(double x=0,double y=0,double r=0);  // Constructors 
	void setRadius(double);                  // Set the radius value 
	double getRadius( ) const;               // Read the radius value 
	double area ( ) const;                   // Calculate the area of the circle 
	friend ostream &operator<<(ostream &,const Circle &);// Overload operator “<<”
protected:
	double radius;
};

// Define the constructor , Initialize center coordinates and radius 
Circle::Circle(double a,double b,double r):Point(a,b),radius(r){ }

// Set the radius value 
void Circle::setRadius(double r)
{
	radius=r;
}

// Read the radius value 
double Circle::getRadius( ) const
{
	return radius;
}

// Calculate the area of the circle 
double Circle::area( ) const
{
	return 3.14159*radius*radius;
}

// Overload operator “<<”, Make it output the information of circle in the prescribed form 
ostream &operator<<(ostream &output,const Circle &c)
{
	output<<"Center=["<<c.x<<", "<<c.y<<"], r="<<c.radius<<", area="<<c.area( )<<endl;
	return output;
}

class Cylinder:public Circle
{
public:
	Cylinder (double x=0,double y=0,double r=0,double h=0);// Constructors 
	void setHeight(double);                      // Set the column height 
	double getHeight( ) const;                    // Read the height of the cylinder 
	double area( ) const;                         // Calculate the surface area of the circle 
	double volume( ) const;                       // Calculate the volume of a cylinder 
	friend ostream& operator<<(ostream&,const Cylinder&);// Overload operator “<<”
protected:
	double height;                               // Cylinder height 
};

// Define the constructor 
Cylinder::Cylinder(double a,double b,double r,double h) :Circle(a,b,r),height(h){}

// Set the column height 
void Cylinder::setHeight(double h)
{
	height=h;
}

// Read the height of the cylinder 
double Cylinder::getHeight( ) const 
{
	return height;
}

// Calculate the surface area of the cylinder 
double Cylinder::area( ) const
{ 
	return 2*Circle::area( )+2*3.14159*radius*height;
}

// Calculate the volume of a cylinder 
double Cylinder::volume() const
{
	return Circle::area()*height;
}

// Overload operator “<<”
ostream &operator<<(ostream &output,const Cylinder& cy)
{
	output<<"Center=["<<cy.x<<","<<cy.y<<"], r="<<cy.radius<<", h="<<cy.height
		<<"\narea="<<cy.area( )<<", volume="<<cy.volume( )<<endl;
	return output;
}

int main( )
{
	Cylinder cy1(3.5,6.4,5.2,10);
	cout<<"\noriginal 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);       
	cout<<"\nnew cylinder:\n"<<cy1;        
	system("pause");
	return 0;
}

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https://yzsam.com/2022/02/202202160944043963.html

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Week 10 - task 3- from point to circle to cylinder

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