In this blog, we will discuss some common C++ programming interview questions. These questions are designed to test your knowledge of C++ and its concepts. Whether you’re preparing for an interview or simply looking to strengthen your C++ skills, this blog will provide you with valuable insights and practice. We will now begin with these C++ programming interview questions!
C++ Programming Interview Questions – Part 1 and 2 (1 to 50)
C++ Programming Interview Questions – Part 3
51. Explain the concept of Member Dereferencing Operators.
In C++, the member dereferencing operators access members (variables or functions) of an object or a pointer to an object. The dot operator (.) allows direct access to the members of an object instance, while the arrow operator (->) enables access to the members of an object through a pointer.
52. What is Early Binding?
Early binding refers to the process in which the compiler links a function or method call to the actual code. This linking occurs at compile time or before runtime and results in faster execution.
53. What is Function Overloading?
Function overloading is the ability to write more than one function with the same name, distinguished by the number or type of the parameters.
54. What is Operator Overloading?
In operator overloading, the behavior of operators can be changed based on the data types they are used with.
55. List out any four operators that can be Overloaded.
You can overload the operators ++, –, -, and *.
56. List out the operators that can be overloaded.
In C++, the following operators cannot be overloaded:
- sizeof operator
- :: scope resolution operator
- ?: conditional operator
- .* pointer-to-member operator
- . dot operator
- -> arrow operator
57. Can member functions be private?
Yes. Both member functions and member data can be private.
58. What is this pointer?
The “this” pointer in C++ refers to the memory address of the current object, and the type of the variable holding the “this” pointer must match the type of the pointer itself.
59. What is a void pointer?
A void pointer in C++ is a pointer that can hold addresses of any type since it has no associated data type.
60. Which operator can be used to determine the size of a data type/class or variable/object?
sizeof operator
61. When can you tell that a memory leak will occur?
A memory leak occurs when a program fails to free a dynamically allocated memory block.
62. What is a Reference Variable?
A reference variable is an alias name for an existing variable. It is another name that refers to the same memory location as the original variable.
63. How do you allocate memory?
To allocate memory, we use the new operator.
64. How do you deallocate memory?
We use the delete operator to deallocate memory in C++.
65. What is the purpose of the Friend Function?
The purpose of a friend function is to access the private and protected data of a class and allow external functions or classes to operate on that data without the need for class objects.
66. What is a Virtual Function?
A virtual function is overridden by a derived class and declared in a base class. The base class marks the function with the keyword ‘virtual’ in the declaration.
67. What is Pure Virtual Function?
A pure virtual function requires derived classes to override it as it has no implementation in the base class.
68. What is Virtual Destructor?
A virtual destructor ensures the proper destruction of derived class objects when deleted through a base class pointer.
69. How can you create a Virtual Copy Constructor?
To create a virtual copy constructor, you need to define a virtual method in the base class that returns a deep copy of the object and then overrides it in each derived class.
70. What is the possibility of declaring a virtual constructor in C++?
The concept of a virtual constructor does not exist in C++.
71. What is Constructor?
When creating a new instance of the class, the constructor automatically invokes itself. It is a special member function of the class and shares the same name as the class itself.
72. What is Default Constructor?
The default constructor is a constructor that has no arguments or has all arguments with default values.
73. What is a Parameterized Constructor?
A parameterized constructor is a constructor that takes one or more arguments or parameters.
74. What is a Copy Constructor?
A copy constructor is a special constructor that creates a new object by copying the values of another object of the same class.
75. What is Destructor?
A destructor is a special member function of a class that is automatically invoked when an object goes out of scope. It has the same name as the class with a tilde character (~) prefixed.