C++ Interview Questions For Freshers
  1. What is the difference between a class and an object, and what are some key features of C++ classes and objects?
  2. What is inheritance in C++, and how can it be used to create new classes that inherit traits from existing classes?
  3. What is the difference between public and private members in a class, and why is this distinction important in C++?
  4. What is the difference between a struct and a class, and when might you use one over the other?
  5. What is the difference between a pointer and a reference, and what are some common use cases for each?
  6. How do const and constexpr differ in terms of functionality and syntax, and when might you use each in your code?
  7. What is the scope resolution operator (::) in C++, and how can it be used to access class members from outside the class?
  8. What is the difference between stack and heap memory allocation, and when might you use each in your code?
  9. What is the difference between pass by reference and pass by value in function arguments, and what are some advantages and disadvantages of each approach?
  10. What is a constructor in C++, and what are some key features of constructors in terms of syntax and functionality?
  11. What is a destructor in C++, and what are some key features of destructors in terms of syntax and functionality?
  12. What is the difference between function overloading and function overriding, and how can you use each technique to improve the flexibility and readability of your code?
  13. What is a template in C++, and how can you use templates to create generic algorithms and data structures that work with any type of data?
  14. What is the difference between new and malloc in C++, and when might you use each approach to allocate memory in your code?
  15. What is a pointer to a function in C++, and how can you use it to call a function through a pointer?
  16. What is an if-else statement in C++, and how can you use it to control the flow of your code based on specific conditions?
  17. What is the difference between a while loop and a for loop in C++, and what are some use cases for each approach when working with loops?
  18. What is the difference between a float and a double data type in C++, and what are some use cases for each approach when working with numerical data?
  19. What is a switch statement in C++, and how can you use it to perform different actions based on the value of a variable?
  20. What is the difference between a header file and a source file in C++, and how can you use both types of files to organize your code?
  21. What is a function prototype in C++, and how can you use it to declare a function before it is defined?
  22. What is a namespace in C++, and how can you use it to avoid naming conflicts in your code?
  23. What is a typedef in C++, and how can you use it to create aliases for complex data types?
  24. What is a macro in C++, and how can you use it to define constants or perform code expansion?
  25. Write a program to print "Hello, World!" in C++.
  26. Write a program to swap two numbers in C++.
  27. Write a program to find the largest number in an array in C++.
  28. Write a program to find the factorial of a number in C++.
  29. Write a program to check if a number is even or odd in C++.
  30. Write a program to reverse a string in C++.
  31. Write a program to find the sum of digits of a number in C++.
  32. Write a program to convert Fahrenheit to Celsius in C++.
  33. Write a program to find the second largest element in an array in C++.
  34. Write a program to check if a string is a palindrome in C++.
C++ Intermediate Interview Questions
  1. What is a virtual function in C++, and how can it be used to create polymorphic behavior in your code?
  2. What is the difference between a pure virtual function and a virtual function with a default implementation, and when might you use each approach?
  3. What is a friend function in C++, and how can it be used to give a non-member function access to the private members of a class?
  4. What is the difference between static and dynamic polymorphism, and how can you use each approach to create more flexible and maintainable code?
  5. What is a smart pointer in C++, and how can you use smart pointers to manage memory allocation and deallocation in your code?
  6. What is a lambda function in C++, and how can you use lambda functions to create anonymous functions that can be passed as arguments to other functions?
  7. What is the difference between a const pointer and a pointer to const, and what are some use cases for each approach?
  8. What is a template specialization in C++, and when might you use template specialization to create more specialized algorithms and data structures?
  9. What is the difference between a namespace and a class, and what are some use cases for each approach?
  10. What is the RAII (Resource Acquisition Is Initialization) idiom in C++, and how can you use RAII to manage resource allocation and deallocation in your code?
  11. What is a template specialization in C++, and how can you use it to create specialized behavior for specific types of data?
  12. What is a functor in C++, and how can you use it to create objects that behave like functions with state?
  13. What is an abstract class in C++, and how can you use it to define a set of methods that must be implemented by derived classes?
  14. What is a virtual destructor in C++, and how can you use it to ensure that derived classes are properly cleaned up when they are destroyed?
  15. What is the difference between a shallow copy and a deep copy in C++, and what are some use cases for each approach when working with objects and data structures?
  16. What is the difference between a const object and a const member function in C++, and what are some use cases for each approach when working with classes?
  17. What is a smart pointer in C++, and how can you use it to manage the memory of objects and data structures?
  18. What is a move constructor in C++, and how can you use it to move the contents of one object to another object?
  19. What is the difference between a lambda function and a function object in C++, and what are some use cases for each approach when working with functions?
  20. What is the difference between a mutex and a semaphore in C++, and how can you use them to manage concurrency and synchronization in your code?
  21. What is a thread-safe data structure in C++, and how can you use it to ensure that data is protected from race conditions and other concurrency issues?
  22. What is a standard library algorithm in C++, and how can you use it to perform common operations on data structures?
  23. What is the difference between a stack and a queue data structure in C++, and what are some use cases for each approach when working with data?
  24. What is the difference between a heap and a priority queue data structure in C++, and what are some use cases for each approach when working with data?
  25. What is a move assignment operator in C++, and how can you use it to move the contents of one object to another object efficiently?
  26. Write a program to implement binary search in C++.
  27. Write a program to implement quicksort in C++.
  28. Write a program to implement a stack in C++.
  29. Write a program to implement a queue in C++.
  30. Write a program to implement a linked list in C++.
  31. Write a program to implement bubble sort in C++.
  32. Write a program to implement insertion sort in C++.
  33. Write a program to implement selection sort in C++.
  34. Write a program to find the GCD of two numbers in C++ using Euclid's algorithm.
  35. Write a program to find the LCM of two numbers in C++.
C++ Interview Questions For Experienced
  1. What is the difference between an abstract class and an interface, and when might you use each approach to create more flexible and extensible code?
  2. What is the difference between a static member and a non-static member in a class, and what are some use cases for each approach?
  3. What are move semantics in C++, and how can you use move semantics to improve the performance of your code when working with large data structures?
  4. What is the difference between a copy constructor and a move constructor, and when might you use each approach to create copies of objects in your code?
  5. What is perfect forwarding in C++, and how can you use perfect forwarding to forward arguments to other functions without losing type information or introducing unnecessary copies?
  6. What is the difference between a thread and a process in C++, and what are some use cases for each approach?
  7. What is a variadic template in C++, and how can you use variadic templates to create functions that accept a variable number of arguments?
  8. What is a tuple in C++, and how can you use tuples to store and manipulate multiple values of different types?
  9. What is the difference between a binary search tree and a red-black tree, and what are some use cases for each approach when working with large sets of data?
  10. What is a functor in C++, and how can you use functors to create objects that behave like functions?
  11. What is the difference between a mutex and a semaphore in C++, and how can you use these synchronization primitives to protect shared resources in a multi-threaded environment?
  12. What is a promise in C++, and how can you use promises and futures to pass data between threads in a safe and efficient way?
  13. What is the difference between an iterator and a pointer in C++, and how can you use iterators to traverse and manipulate data in containers such as vectors, lists, and maps?
  14. What is a move assignment operator in C++, and when might you use a move assignment operator to assign an object to another object?
  15. What is a volatile variable in C++, and when might you use a volatile variable to ensure that changes to the variable are always visible to other parts of the program?
  16. What is the difference between a local and a global variable in C++, and what are some use cases for each approach when working with variables?
  17. What is a binary semaphore in C++, and how can you use binary semaphores to protect shared resources in a multi-threaded environment?
  18. What is the difference between a monolithic kernel and a microkernel, and what are some advantages and disadvantages of each approach when designing an operating system?
  19. What is the difference between a map and a set in C++, and what are some use cases for each approach when working with data structures?
  20. What is virtual inheritance in C++, and how can you use virtual inheritance to create a class hierarchy that avoids problems with multiple inheritance?
  21. What is a function object in C++, and how can you use function objects to create objects that behave like functions with state?
  22. What is the difference between heap and stack memory allocation, and what are some use cases for each approach when working with memory management in your code?
  23. What is the difference between a container and an adapter in C++, and what are some use cases for each approach when working with data structures?
  24. What is a recursive function in C++, and when might you use recursion to solve problems in your code?
  25. What is a CRTP (Curiously Recurring Template Pattern) in C++, and how can you use it to implement a type of static polymorphism in your code?
  26. What is the difference between a lambda capture by reference and a lambda capture by value in C++, and what are some use cases for each approach?
  27. What is a variadic function in C++, and how can you use it to create functions that accept a variable number of arguments of any type?
  28. What is a static assertion in C++, and how can you use it to enforce compile-time constraints on your code?
  29. What is a type trait in C++, and how can you use it to inspect and manipulate the properties of types in your code?
  30. What is the difference between a coroutine and a thread in C++, and what are some use cases for each approach when working with concurrency?
  31. What is the difference between a standard iterator and a reverse iterator in C++, and what are some use cases for each approach when working with data structures?
  32. What is a type erasure in C++, and how can you use it to write code that works with objects of different types without knowing their types in advance?
  33. What is the difference between a range-based for loop and a traditional for loop in C++, and what are some use cases for each approach when working with loops?
  34. What is a reference wrapper in C++, and how can you use it to create a reference-like object that can be passed by value to functions?
  35. What is a member function pointer in C++, and how can you use it to call a member function through a pointer?
  36. What is a user-defined literal in C++, and how can you use it to define new literal types and overloading literals?
  37. What is the difference between a default constructor and a copy constructor in C++, and what are some use cases for each approach when working with objects?
  38. What is a template metaprogramming in C++, and how can you use it to perform compile-time computations and optimizations?
  39. What is a type-safe printf function in C++, and how can you use it to ensure that printf-style functions are called with the correct types of arguments?
  40. What is a proxy object in C++, and how can you use it to add behavior to an existing object without modifying its interface?
  41. What is the difference between a variadic template and a variadic function in C++, and what are some use cases for each approach when working with functions and data structures?
  42. What is a constexpr function in C++, and how can you use it to perform compile-time computations and optimizations?
  43. What is a bitfield in C++, and how can you use it to pack multiple Boolean flags into a single variable?
  44. What is a conditional operator in C++, and how can you use it to create concise and readable conditional expressions?
  45. What is the difference between a function pointer and a function object in C++, and what are some use cases for each approach when working with functions?
  46. Write a program to implement a binary tree in C++.
  47. Write a program to implement a hash table in C++.
  48. Write a program to implement Dijkstra's algorithm in C++.
  49. Write a program to implement Bellman-Ford algorithm in C++.
  50. Write a program to implement Kruskal's algorithm in C++.
  51. Write a program to implement Prim's algorithm in C++.
  52. Write a program to implement the A* algorithm in C++.
  53. Write a program to implement the Floyd-Warshall algorithm in C++.
  54. Write a program to implement the Knapsack problem using dynamic programming in C++.
  55. Write a program to implement the Longest Common Subsequence problem using dynamic programming in C++.