C++ Interview Questions

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  1. What is C++?
  2. Differentiate declaration and definition?
  3. Explain what is a class in C++?
  4. How can you specify a class in C++?
  5. What is the difference between realloc() and free()?
  6. Define an inline function?
  7. What is the difference between an ARRAY and a LIST?
  8. What is a template?
  9. What are the features of C++ different from C?
  10. What are tokens in C++?
  11. Define Constructors?
  12. Define destructors?
  13. Differentiate between Object and Instance?
  14. What do you mean by reference variable in C++?
  15. What are the basic elements of a function in C++?
  16. Explain what is Loop function? What are different types of Loops?
  17. Explain C++ exceptional handling?
  18. Mention what are the types of Member Functions?
  19. Explain what is multi-threading in C++?
  20. Explain upcasting in C++?
  21. Explain what is pre-processor in C++?
  22. What is namespace std?
  23. What is the difference between prefix and postfix versions of operator ++()?
  24. What is public, protected and private?
  25. What are the basic components of a class?
  26. What do you mean by ‘void’ return type?
  27. State the dissimilarity between delete and delete[]?
  28. What is a Storage Class? Mention the Storage Classes in C++.
  29. What do you mean by persistent and non-persistent objects?
  30. What are the Comments in C++?
  31. How do you define/declare constants in C++?
  32. What is the difference between equal to (==) and Assignment Operator (=)?
  33. What is a Reference Variable in C++?
  34. What are the Extraction and Insertion operators in C++? Explain with examples.
  35. Explain Pass by value and Pass by reference?
  36. What is a Static Variable?
  37. What is Structure?
  38. What is Namespace?
  39. Enlist the difference between Method Overloading and Method Overriding in C++?
  40. List the various OOPs concepts in C++?
  41. Define data abstraction in C++?
  42. Define encapsulation?
  43. Explain the main difference between a class and an object?
  44. Define inheritance?
  45. Define abstract class in C++?
  46. Name the data type which can be used to store wide characters in C++.
  47. Explain Inheritance in C++?
  48. Give the full form of STL in C++?
  49. When should we use multiple inheritance?
  50. Give the difference between structures and class?

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