class inheritance code example

Example 1: what is a child inheritance in python with example

# =============================================================================
# Inhertance
# =============================================================================
class A:
    def feature1(self):
        print('Feature 1 in process...')
    def feature2(self):
        print('Feature 2 in process...')       #Pt.1
        
class B:
    def feature3(self):
        print('Feature 3 in process...')
    def feature4(self):
        print ('Feature 4 in process...')
        
a1 = A() 

a1.feature1()
a1.feature2()

a2 = B()

a2.feature3()
a2.feature4()
# THE ABOVE PROGRAM IS A PROGRAM WITHOUT USING INHERITANCE
        
# WITH THE USE OF INHERITANCE IS BELOW
class A:
    def feature1(self):
        print('Feature 1 in process...')    
    def feature2(self):
        print('Feature 2 in process...')
        
class B(A):
    def feature3(self):
        print('Feature 3 in process...')    # Pt.2
    def feature4(self):
        print ('Feature 4 in process...')
        
a1 = A() 

a1.feature1()
a1.feature2()

a2 = B()

a2.feature3()
a2.feature4()


# NOW TO CHECK OUT THE DIFFERENCE BETWEEN Pt.1
# AND Pt.2 TRY RUNNIG THE CODE ON THE BASIS OF
# INHERITANCE, IN OTHER WORDS TRY RUNNING ONLY 
# B CLASS IN Pt.2 AND THEN RUN ONLY a2
# YOU WILL SEE A DIFFERENCE IN THE RUNNING OF 
# ONLY a2,,,, IT WILL STILL SHOW THAT FEATURE 3
# AND 4 IS IN PROCESS,, THIS MEANS THAT B IS THE

Example 2: inheritance in python 3 example

class Robot:
    
    def __init__(self, name):
        self.name = name
        
    def say_hi(self):
        print("Hi, I am " + self.name)
        
class PhysicianRobot(Robot):

    def say_hi(self):
        print("Everything will be okay! ") 
        print(self.name + " takes care of you!")

y = PhysicianRobot("James")
y.say_hi()

Example 3: inheritance in c++

#include <iostream>

// Example in a game we have multiple entities so we put commom functionality and variables in base class Entity and Create Sub Classes Of the base class
class Entity {
	//This is a base class of all entities
public:
	float x =0 , y = 0;//this is the position of entity
	void Move(float xa, float ya) {
		x += xa;
		y += ya;
		//this function moves entity
	}
};
// in this example Player  inherits from public entity
class Player:public Entity// inhertiting From Entity class 
{
	// Player class is a Sub class of Entity
	//Player Class ha all the functions and var of public entity + some additional functionality and variables it is a superset of Entity

	
public : 
	const char* name = nullptr;
	void Print() {
		std::cout << name << std::endl;
	}
	//Player class has type of palyer and type of entity
	//Because it has additional method Print and var name
	//We can create entity from palyer because player has everything of entity but we can't create an Entity from player because it has additional things	
};
int main()
{
	Player D;
	D.x = 5.5f;//initializing inherited variable 
	D.y = 4.4f;//initializing inherited variable 
	D.Move(1.1f,2.2f);//Calling inherited method
	D.name = "Caleb";//initializing variable owned by player class 
	D.Print();//calling method owned by Player class
	//Now looking at the size of each class
	std::cout <<"Size of Entity was : " << sizeof(Entity) << std::endl;
	std::cout <<"Size of Player was : "<< sizeof(Player) << std::endl;
	//size of Entity output => 8
	//size of Player output => 12
	//because Entity has 2 floats = 4bytes +4 bytes =8 bytes
	//Class Player has 2floats and const char ptr which is 4 bytes for 32 bit application  = (4 +4 + 4)bytes = 12bytes 
	//Note:At the end inheretance is just a way to prevent code duplication
	std::cin.get();
}

Example 4: inheritence in python

# =============================================================================
# Inhertance
# =============================================================================
class A:
    def feature1(self):
        print('Feature 1 in process...')
    def feature2(self):
        print('Feature 2 in process...')       #Pt.1
        
class B:
    def feature3(self):
        print('Feature 3 in process...')
    def feature4(self):
        print ('Feature 4 in process...')
        
a1 = A() 

a1.feature1()
a1.feature2()

a2 = B()

a2.feature3()
a2.feature4()
# THE ABOVE PROGRAM IS A PROGRAM WITHOUT USING INHERITANCE
        
# WITH THE USE OF INHERITANCE IS BELOW
class A:
    def feature1(self):
        print('Feature 1 in process...')    
    def feature2(self):
        print('Feature 2 in process...')
        
class B(A):
    def feature3(self):
        print('Feature 3 in process...')    # Pt.2
    def feature4(self):
        print ('Feature 4 in process...')
        
a1 = A() 

a1.feature1()
a1.feature2()

a2 = B()

a2.feature3()
a2.feature4()