C++ Programming Interview Questions

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

C is procedural, while C++ supports object-oriented programming with classes and objects.

Encapsulation, Abstraction, Inheritance, and Polymorphism.

A class is a blueprint for creating objects.

An object is an instance of a class.

A constructor initializes an object when it is created.

A destructor releases resources when an object is destroyed.

Inheritance allows a class to acquire properties of another class.

Polymorphism allows the same function to behave differently.

Multiple functions with the same name but different parameters.

Giving special meaning to operators for user-defined types.

A function that supports runtime polymorphism.

A class with at least one pure virtual function.

Standard Template Library provides containers, algorithms, and iterators.

A dynamic array that resizes automatically.

Allocated memory that is not properly released.

Pointer referencing freed memory.

Smart pointers manage memory automatically (unique_ptr, shared_ptr).

Resource Acquisition Is Initialization ensures safe resource handling.

Prevents naming conflicts by grouping identifiers.

Templates allow writing generic and reusable code.

Handling runtime errors using try, catch, and throw.

Executing multiple threads concurrently.

Threads waiting indefinitely for resources.

An 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 correct method overriding.

Copies object references instead of actual data.

Copies actual data and allocates new memory.

Ensuring data is 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 is runtime-checked.

Adds or removes const qualifier.

Performs low-level type conversion.

Evaluates expressions at compile time.

Specifies that a function does not throw exceptions.

Expands function code at compile time.

Preserves value and limits scope.

Refers to a variable defined in another file.

A loop that never terminates.

The entry point of a C++ program.

Call by value passes copies; call by reference passes memory addresses.