pure virtual function in c 2b 2b

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showing results for - "pure virtual function in c 2b 2b"
Till
16 May 2017
1#include <iostream>
2#include  <string>
3//Pure virtual function  or inteface allows us to define a function in a base class that doesn't have an implementation or definition in the base class and force sub classes to implement that function
4//Pure virtual function is also called an interface in other languages
5class Entity {
6public:
7	//virtual std::string GetName() { return "Entity"; }//This is a function that is just virtual .Overriding this function in sub class is optional we can instantiate subcllass without overriding  or implementing this function
8	
9	//Below is an example a Pure Virtual Function
10	//It is an unimplemented function ant it forces the  sub class to implement it and define it
11	//You will not be able to instantiate sub class without implementing or defining the function in sub class
12	virtual std::string GetName() = 0; 
13  //the pure virtual function must have virtual written at the beginning and =0 at the end
14 //This function cannot contain any definition in base class,it is just a declaration
15};
16class Player :public Entity {
17	std::string m_name;
18
19public:
20	Player(const std::string& name)
21		:m_name(name)
22	{};
23	void Print() { std::cout << "This is Sub class" << std::endl; };
24	std::string GetName()override { return m_name; };//Pure virtual functions is implemented here in this sub class
25};
26void PrintName(Entity* entity) {
27
28	std::cout << entity->GetName() << std::endl;
29}
30int main()
31{
32	//Entity a;//We can't do this because class Entity contains function that is unimplemented
33	Player x("Jacob");//This will work because we have implemented or defined the function in this sub class
34	std::cin.get();
35}
Henri
25 Aug 2020
1//Code by Soumyadeep Ghosh 
2//insta : @soumyadepp
3//linked in : https://www.linkedin.com/in/soumyadeep-ghosh-90a1951b6/
4#include <bits/stdc++.h>
5
6using namespace std;
7
8class person
9{
10  string p_id;
11  public:
12  virtual void get_info()=0; //declaring person as abstract class
13  virtual void show()=0;
14};
15
16class student:public person
17{
18  string name;
19  int roll_no;
20  public:
21  /*overriding the pure virtual function declared in base class otherwise
22    this class will become an abstract one and then objects cannot be created
23    for the same*/
24    void get_info()
25    {
26      cout<<"Enter name of the student "<<endl;
27      cin>>name;
28      cout<<"Enter roll number of the student "<<endl;
29      cin>>roll_no;
30    }
31   void show()
32   {
33     cout<<"Name : "<<name<<" Roll number: "<<roll_no<<endl;
34   }
35};
36
37int main()
38{
39  person *p;
40  p=new student;
41  p->get_info();
42  p->show();
43  return 0;
44}
45
Thais
24 Aug 2018
1#include <iostream>
2#include<string>
3	//Virtual Functions are functions that allow us to override methods in subclasses
4//In this example  we have an entity class as a base class and class player inherits from public entity 
5class Entity {
6public:
7	virtual std::string GetName() { return "Entity"; }//It is a method in base class that we want to modify in sub class Player
8	void Print() { std::cout << "This is Base class" << std::endl;}//function that is not virtual
9};
10class Player :public Entity {
11	std::string m_name;
12
13public:
14	Player(const std::string& name)
15		:m_name(name)
16	{};
17	void Print() { std::cout << "This is Sub class" << std::endl; };//function that is not virtual
18	std::string GetName()override { return m_name; };//overriding the function in sub class
19};
20
21int main()
22{
23	Entity* e = new Entity();
24	std::cout << e->GetName() << std::endl;
25	Player* p = new Player("Jacob");
26	std::cout << p->GetName() << std::endl;
27	PrintName(p);// This function calls the GetName method from the Player instance despite it takes an entity instance as a parameter this is because player class is a sub  class of Entity and the method is marked virtual it will map with the method in the Player class and call it from there .It outputs => Jacob
28	//if It was not virtual it would have called The method From Entity Instance and output would be => Entity
29	Entity* notvirtualentity = new Entity();
30	Player* notvirtualpalyer = new Player("XX");
31	notvirtualentity =  notvirtualpalyer;
32	notvirtualentity->Print();//It prints => this is base class if it was virtual function it would call print function from Player Class and print => This is subclass
33	std::cin.get();
34}
Kenna
27 Aug 2020
1#include <iostream>
2#include <string>
3
4class Entity {
5public:
6  virtual std::string getName();
7  void print(); 
8};
9
10virtual std::string Entity::getName() {
11	return "Entity";
12}
13
14void Entity::print() {
15	std::cout << "This is the base class" << std::endl;
16}
17
18class Player : public Entity {
19  std::string m_name;
20public:
21	Player(const std::string& name): m_name(name) {};
22  	void print();
23  	virtual std::string getName();
24};
25
26virtual std::string Player::getName() {
27	return m_name;
28}
29
30void Player::print() {
31	std::cout << "This is the sub class" << std::endl;
32}
33
34int main() {
35	Entity* e = new Entity();
36  	std::cout << e->getName() << std::endl;
37  	Player* p = new Player("Jacob");
38  	std::cout << p->getName() << std::endl;
39  	p->print();
40  	e->print();
41  
42  	Entity* notVirtualEntity = new Entity();
43  	Player* notVirtualPlayer = new Player("Bob");
44  	notVirtualEntity = notVirtualPlayer;
45  	notVirtualEntity->print();
46  	notVirtualEntity->getName();
47}
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