C++ MCQ questions with answers

Practice C++ MCQ questions with answers on pointers, OOP, STL, memory management, and language fundamentals.

C++ Language

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C++ MCQ questions with answers

Which statement best describes C++ compared with C?

An object in C++ is:

Which statement about a C++ reference is correct?

Which feature is valid for a pointer but not for a normal reference?

Function overloading in C++ requires functions to differ in:

Which of the following can be overloaded for a user-defined class?

A constructor in C++:

What is the correct purpose of a destructor?

Which statement about `new` is correct?

Which access level is the default inside a `class` in C++?

What is the main purpose of a namespace in C++?

Which statement correctly compares `struct` and `class` in C++?

Which memory area is typically used for local variables inside a function?

A copy constructor is generally called when:

Shallow copy becomes risky mainly when a class contains:

Which statement correctly describes copy assignment?

Inside a non-static member function, `this` points to:

A static data member in a class is:

Which statement about static member functions is correct?

A friend function is mainly used when:

Which statement about inline functions is most accurate?

Which option best describes a deep copy?

Compared with `malloc()`, `new` in C++ additionally:

Which statement about heap memory is correct?

Inheritance in C++ is mainly used to:

Which type of inheritance is supported in C++ but often discussed carefully because it can introduce ambiguity?

Polymorphism in C++ means:

Which is an example of runtime polymorphism in C++?

A virtual function is primarily used to enable:

Why is a virtual destructor important in a polymorphic base class?

A pure virtual function is declared using:

A class with at least one pure virtual function is usually:

Object slicing occurs when:

Which statement correctly compares overloading and overriding?

If a base pointer points to a derived object and the called method is not virtual, C++ generally uses:

Which statement about abstract classes is correct?

Templates in C++ are mainly used for:

Which statement best describes a class template?

The STL mainly provides:

Which container is usually the default choice when you need a dynamic array with fast random access?

Which statement about `list` is correct?

Which container keeps keys sorted by default?

The average-case strength of `unordered_map` is:

An iterator in C++ is best understood as:

A lambda expression in C++ is:

The main purpose of `auto` in C++ is to:

Which statement about smart pointers is correct?

Which smart pointer type represents exclusive ownership?

RAII in C++ mainly means:

The Rule of Five extends the Rule of Three by adding:

Which statement best describes move semantics?

Which statement about `const` member functions is correct?

Which null-pointer literal should be preferred in modern C++?

Which cast performs runtime-checked downcasting in a polymorphic class hierarchy?

Which cast is the lowest-level and should usually be used very carefully?

In a `vector`, `size()` returns:

In a `vector`, `capacity()` refers to:

Which statement about C++ exceptions is correct?

Which is an example of a compile-time error?

Which is more likely to be a runtime error?

C++ MCQ questions with answers

Which statement best describes C++ compared with C?

An object in C++ is:

Which statement about a C++ reference is correct?

Which feature is valid for a pointer but not for a normal reference?

Function overloading in C++ requires functions to differ in:

Which of the following can be overloaded for a user-defined class?

A constructor in C++:

What is the correct purpose of a destructor?

Which statement about `new` is correct?

Which access level is the default inside a `class` in C++?

What is the main purpose of a namespace in C++?

Which statement correctly compares `struct` and `class` in C++?

Which memory area is typically used for local variables inside a function?

A copy constructor is generally called when:

Shallow copy becomes risky mainly when a class contains:

Which statement correctly describes copy assignment?

Inside a non-static member function, `this` points to:

A static data member in a class is: