Q:
Write some important rules associated with virtual functions?
belongs to collection: C++ Interview Questions and Answers(2022)
C++ Interview Questions and Answers(2022)
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- What is the difference between C and C++?
- What is a class in C++?
- What is an object in c++?
- Why use access modifiers in C++?
- What are C++ access modifiers?
- What are the differences between a class and a structure in C++?
- Why is the size of an empty class not zero in C++?
- What is a constructor in c++?
- Is the default constructor exists in C++?
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- What are the different types of polymorphism in C++?
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- What is a reference in C++?
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- What is the difference between constructor and destructor in c++?
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- Where we should use this pointer in C++?
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- What is the difference between new and malloc in c++?
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- Explain some ways of doing function overloading in C++?
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- What is the difference between function overloading and Operator Overloading?
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- What is the difference between function overloading and Overriding in c++?
- How to create and use a reference variable in C++?
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- What is the virtual function?
- Write some important rules associated with virtual functions?
- Name the Operators that cannot be Overloaded in c++
- Figure out functions that cannot be overloaded in C++?
C++ programming
Answer:
Below we are mentioning few rules for virtual function in C++.
- Virtual functions cannot be static and also cannot be a friend function of another class.
- Virtual functions should be accessed using pointer or reference of base class type to achieve run time polymorphism.
- The prototype of virtual functions should be the same in the base as well as derived class.
- They are always defined in the base class and overridden in the derived class. It is not mandatory for the derived class to override (or re-define the virtual function), in that case, the base class version of the function is used.
- A class may have a virtual destructor but it cannot have a virtual constructor.
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