C++ Interview Questions

C++ is a high-performance programming language supporting procedural, object-oriented, and generic programming.

C is procedural; C++ supports OOP concepts like classes, inheritance, and polymorphism.

Encapsulation, Abstraction, Inheritance, and Polymorphism.

A class is a blueprint used to create objects.

An object is an instance of a class.

A constructor initializes objects automatically at creation.

A destructor releases resources when an object is destroyed.

Inheritance allows one class to acquire properties of another class.

Ability of a function or object to behave differently in different contexts.

Multiple functions with same name but different parameters.

Redefining operators for user-defined types.

A function that supports runtime polymorphism.

A class containing at least one pure virtual function.

Wrapping data and methods together and restricting access.

Hiding internal details and showing only essential features.

Standard Template Library provides containers, algorithms, and iterators.

Vector is dynamic; array has fixed size.

Allocated memory not properly released.

Pointer pointing to deallocated memory.

Pointers that automatically manage memory (unique_ptr, shared_ptr).

Resource Acquisition Is Initialization for safe memory management.

Prevents name conflicts by grouping identifiers.

Prevents modification of variables.

Preserves value and restricts scope.

Expands function code at compile time for speed.

Allows writing generic and reusable code.

Handling runtime errors using try, catch, throw.

Executing multiple threads concurrently.

Threads waiting indefinitely for resources.

Anonymous inline function introduced in C++11.

Automatically deduces variable type.

Transfers resources instead of copying.

Used to implement move semantics.

Type-safe null pointer introduced in C++11.

Prevents implicit type conversion.

Prevents inheritance or overriding.

Ensures function overrides base class method.

Copies object references instead of actual data.

Copies actual data and allocates new memory.

Ensuring objects are not modified unintentionally.

Function allowed to access private members.

Ambiguity caused by multiple inheritance.

Ensures proper cleanup of derived objects.

Converting one data type to another.

static_cast is compile-time; dynamic_cast checks runtime type.

Adds or removes const qualifier.

Low-level type casting.

Compile-time evaluated expressions.

Specifies function does not throw exceptions.

Call by value passes copies; call by reference passes addresses allowing modification.