C++ interview questions

Preview Questions

1. How Does a Pointer Differ from a Reference in C++?

   In C++, both pointers and references are used to access variables indirectly, but they differ in how they work and behave. 1. Definition: - Pointer: A variable that stores the memory address of another variable. -...

2. What Are Smart Pointers in C++, and Why Are They Important?

   Smart pointers in C++ are special classes that manage the lifetime of dynamically allocated objects. They automatically handle memory allocation and deallocation, preventing memory leaks and dangling pointer issues. In...

3. How Would You Differentiate new from malloc in C++?

   In C++, both new and malloc are used to allocate memory dynamically, but they differ in how they work and what they support. 1. Syntax and Type Safety: - new automatically returns a pointer of the correct type. - malloc...

4. What Is the Role of a Virtual Function in C++?

   A virtual function in C++ is a member function in a base class that can be overridden in a derived class to achieve runtime polymorphism. It allows C++ to decide which function to call at runtime based on the actual...

5. What Is RAII, and Why Is It Important in C++?

   RAII stands for "Resource Acquisition Is Initialization". It is a key programming concept in C++ that ensures resources such as memory, file handles, or network connections are properly acquired and automatically...

6. Compare const and constexpr in C++?

   Both const and constexpr are used to define constants in C++, but they differ in when and how their values are determined. 1. const The value of a const variable cannot be changed after initialization. Its value is...

7. How Does Memory Management Work in C++?

   Memory management in C++ refers to how programs allocate, use, and free memory during execution. It gives developers complete control over how memory is handled, unlike languages such as Java or Python that use...

8. What Is Inheritance in C++, and How Does It Work?

   Inheritance in C++ is an object-oriented programming concept that allows one class to acquire the properties and behavior (data members and member functions) of another class. It promotes code reusability and helps...