Virtual Functions in C++ | C++ Tutorials for Beginners #56 

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Summary- // As we have seen in tut55.cpp that BASE class pointer pointing to DERIVED class object can only access BASE class inherited members which is a default behavior. // But if you want to change default behavior and want to access the members of derived class by a pointer pointing to derived class object then use virtual keyword in front of BASE class member function.

NOTE: You can also use "void virtual" instead of '"virtual void "

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Great work Harris bhai, kindly also give the concept of Shallow copy vs Deep copy as this question was asked in an inteview on basic level of programming. THANKS

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Virtual functions in C++ allow runtime polymorphism, where the function called is determined at runtime based on the object type, not the pointer type. Key moments: 00:00 Virtual functions in C++ allow a function in a base class to be overridden in a derived class. Making a function virtual enables runtime polymorphism, executing the derived class function when called through a base class pointer. -Understanding the concept of pointer to derived class and polymorphism is crucial for comprehending virtual functions in C++. This knowledge forms the foundation for implementing runtime polymorphism. -By making a function virtual in the base class, you ensure that the derived class's version of the function is executed when called through a base class pointer. This dynamic behavior enhances code flexibility and extensibility. 06:29 Polymorphism in C++ allows objects from different classes to respond to messages, achieving runtime polymorphism through virtual functions. Compile-time polymorphism involves function and operator overloading for different behaviors based on arguments. -Explanation of polymorphism in C++. Objects from different classes can react to messages, enabling runtime polymorphism with virtual functions. -Compile-time polymorphism in C++. Function and operator overloading create different behaviors based on arguments, determining the function binding during compilation. 08:29 The video discusses virtual functions in C++, providing examples and rules for implementation. It emphasizes understanding and practice for effective learning. -The importance of practicing virtual functions to enhance understanding and learning in C++. Encouragement to create more examples for better comprehension. -Upcoming content on rules of virtual functions, late binding implementation, and examples in the next video. Emphasis on grasping the virtual keyword and functions.

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Agar vise versa ho to?? I mean agar hume derieved class ke obj ko point karana hai base class ke member function ko aur hume base class ka function execute karana haii..to??...

with the pointer of base-type we can use functions of derived class if and only if the base function is virtual, however, the derived variables won't change with pointer.

but what if you have passed different arguments to the display function in both the class? its not working then.

you missed the operator overloading topic :o

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This is another easy example of Virtual Function... #include using namespace std; class BasicCar { public: virtual void car() { cout

Why the virtual function is not working if we pass arguments in derived class function??

Sir muze main function me derived class ke variable ko initialize karna hai to kya muze derived class ka pointer create karna padega?

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Question ? Bro, as you have said in tut55.cpp, we can use derived class members if we use derived_class_pointer pointing to derived_class. (like base_class_pointer= &obj_derived), so why there is a need of "Virtual functions" to access derived class member function. We can do the same by creating a pointer pointing to derived class (like derived_class_pointer= &obj_derived).

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sir please also teach exception handling and operator overloading

Harry bhai, what if we want to assign an integer value to the variable in derived class using "base_class_pointer->var_derived = 20;".......this shows an error

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Sir, we can access the derived class using it's objects, so why there is virtual function? why do we want base class pointer to access derived class methods? If anyone is having this answer please reply. This question is asked to me in an interview but I was unable to answer it. I replied that when we create a class to inherit it's properties then we need this but interviewer was not convinced.

Sir how to access derived class variable using base class pointer? Can we modify the value of var_derived by using base class pointer???

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bhai operator overloading pa video bano plz :)

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It is necessary to take the pointer of base class?

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Using Constructor #include using namespace std; class CS{ public: string name; CS(string n){ name = n; } virtual void Print(){ cout

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sir jo display function derived class m h woh base class se derived hoga ya woh derived class m nya banaya gya h???

6:05 it was simple only🥺

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concept cleared 6:03

watched many videos brother but you cleared all the doubts that i had on virtual function. Thank you😍

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Thank you so much Harry bhai 💗 virtual function clear ...

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I have understood the concept of virtual functions and pointer to derived class but I'm not able to understand why we can't simply create a pointer of derived class in order to access it's function because even after pointing a base class pointer to derived class object, we are not able to access or modify the variable and functions of the derived class unless we declare virtual function in base class. If someone can provide me the advantages of it, that'll be really helpful.

Sir , can we made both function as virtual ... ? It'll throw any error ?

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Harry Bhaii Agar base class ke pointer ko derived class ke object ko point karana zaroori h kyaaa??

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difference between shallow and deep copy?

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Why we created object of base class in virtual function without that also we can run the virtual function while using baseclass pointer

5:35 itni der se error aa rha tha fir pata chala maine derived class bana to di thi lekin maine inherit nhi kiya tha base class se

obj_derived.display() se b jo class ka function call krna ho ho jata he

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Hello Harry. The same is also true with references, so why do we use pointers ?

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But why are we creating a pointer of base class to run function of derived class instead why not creating a pointer of derived class?

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Thanks Harry bhai for explaining virtual functions !!

bro but how can you use member of derived class form base pointer because we inherite derived class so how can you access derived class member ?

what if we want to acess var_derived with base_class_pointer??

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#include #include using namespace std; class Base { public: int a = 10; virtual void getData() { cout