C++ Interview Questions and Answers(2022)
- Define C++?
- 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++?
- What are the various OOPs concepts in C++?
- What is polymorphism in C++?
- What are the different types of polymorphism in C++?
- Compare compile-time polymorphism and Run-time polymorphism in c++?
- What is encapsulation in c++?
- What Is Inheritance in c++?
- What is an abstraction in C++?
- What is a reference in C++?
- What is the default constructor in c++?
- What is a destructor in C++?
- When is the destructor called in c++?
- Is it possible to overload the destructor of the class in c++?
- Should I explicitly call a destructor on a local variable in c++?
- How destructors are different from a normal member function in c++
- What is the difference between constructor and destructor in c++?
- What is “this” pointer in c++?
- Where we should use this pointer in C++?
- What is a “new” keyword in C++?
- What is the difference between new and malloc in c++?
- What is the difference between delete and free in c++?
- What do you mean by call by value and call by reference in c++?
- What is a namespace in c++?
- How to use namespace in C++?
- What is a member function in C++?
- What are static members in C++?
- What do you mean by inline function and How to implement the inline function in C++?
- What is the use of the inline function in C++?
- What is the advantage and disadvantage of the inline function?
- What’s the difference between static, inline, and void with functions?
- What is function overloading in C++?
- Explain some ways of doing function overloading in C++?
- What is operator overloading?
- What is the difference between function overloading and Operator Overloading?
- What is the assignment operator in C++?
- Can you overload a function based only on whether a parameter is a value or a reference in c++?
- What is Overriding in c++?
- Write a C++ program that describes function Overriding?
- What is the difference between function overloading and Overriding in c++?
- How to create and use a reference variable in C++?
- What is the difference between a pointer and a reference in c++?
- 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:
We are breaking this question into three-part because a static keyword has an important role in C++.
member variable as static (static member variable):
The static keyword allows a variable to maintain its value among different function calls. The value of static variable changes when the variable has been accessed, the variable keeps the new value. If the same variable gets accessed again, it would be holding its most recent value. This is possible because, when the static variable is declared, the compiler uses a separate memory area to store it (BSS or DS). By doing this, when the value of the static variable gets changed, it is updated in the memory it is occupying. And because this memory is separate, the compiler can monitor its values even when its function exits.
function as static (static member functions):
There are some points related to the static function.
destructor as static:
A “static destructor” is a static member function of the class that accepts one argument a pointer to the object of that class to be destroyed. It is probably used along with “a factory method”. When there is a need to restrict the creation of instances of some class to free store only and/or perform additional steps before or after the creation of an object. Similar steps may need to be taken before and/or after destroying an instance.
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