Experiment 3 inheritance and derived classes

• Experimental purpose or task

Object oriented software development method is a software development method developed by absorbing useful concepts and effective methods in the field of software engineering . It sets abstraction 、 encapsulation 、 Inheritance and polymorphism in one , It can help programmers develop modularity 、 High degree of data abstraction , Reflect information concealment 、 Reusable 、 Easy to modify 、 Easy to transplant and other features of the program . 

This course is based on C++ The object-oriented mechanism in the language is mainly , Discuss the basic idea and method mechanism of object-oriented programming . Through the experimental teaching link , Enable learners to pass a certain amount of program examples and related exercises in the learning process , Gradually master C++ Process oriented and object-oriented functions , So as to master the basic knowledge and skills of object-oriented programming .

Through this experimental teaching link , It can improve learners' professional ability in the following aspects ：

1. Improve learners' abstract ability and logical thinking ability to solve problems ;
2. Preliminarily master the object-oriented software design ideas ;
3. Improve learners' self-learning ability of object-oriented program development tools ;
4. Make learners have the basic literacy of object-oriented program development .

• Basic requirements of experimental teaching

1. Understand and master C++ Advanced features of language functions , Understand the data abstraction and data encapsulation of object-oriented programming , master C++ The mechanism and method of data encapsulation and information hiding through classes and objects ;
2. Understand the design idea of object-oriented programming code reuse , master C++ Class inheritance and derivation mechanism and implementation approach ;
3. Understand the concept and idea of polymorphism in object-oriented programming , master C++ Operation overload 、 function overloading 、 The mechanism and method of realizing polymorphism by virtual function Technology ;
4. Understand and master C++ I/O The idea and method of device independence of stream to realize input and output .

• Inheritance and derived classes

#include<iostream>
#include<string>
#include<stdlib.h>
using namespace std;
 
class Building
{
public:
	void Buildings(string address, int housenum)
	{
		address = address;
		housenum = housenum;
	}
	public:
	string address;             
	int housenum;              
};
 
 
class House:public Building
{
public:
	void Houses(Building b,int roomnum, int area)
	{
		this->address = b.address;
		this->housenum = b.housenum;
		roomnum = roomnum;
		area = area;
	}
	void printfout()
	{
		cout <<" The address is ："<< address << endl;
		cout <<" Building No ："<<housenum << endl;
		cout <<" room number ："<<roomnum << endl;
		cout <<" area ："<<area <<" Square meters "<< endl;
	}
public:
	int roomnum;          
	int area;               
};
 
class Office:public Building
{
public:
	void Offices(Building b,string officename, string telnum)
	{
		this->address = b.address;
		this->housenum = b.housenum;
		officename = officename;
		telnum = telnum;
	}
	void printfout()
	{
		cout <<" The address is ："<< address << endl;
		cout <<" Building No ："<<housenum << endl;
		cout << " Office name ：" << officename << endl;
		cout << " Phone number ：" << telnum << endl;
	}
public:
	string officename;		
	string telnum;			
};
 
 
int main()
{
	Building building;
	House house;
	Office office;
 
	building.Buildings(" Shaanxi University of science and technology ", 300);
 
	house.Houses(building,413,200);
	house.printfout();
 
	office.Offices(building," The office ","83621");
	office.printfout();

	return 0;
}