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Question-1. What is Eiffel?
Answer-1: Eiffel is an object-oriented programming language designed for software engineering.
Question-2. Who developed Eiffel?
Answer-2: Eiffel was developed by Bertrand Meyer in 1985.
Question-3. What is the main focus of Eiffel?
Answer-3: Eiffel focuses on software reliability and maintainability through Design by Contract (DbC).
Question-4. What is Design by Contract (DbC)?
Answer-4: DbC is a methodology where software components are built with clearly defined contracts.
Question-5. What is the primary data structure in Eiffel?
Answer-5: The primary data structure is the class, which defines objects and their behavior.
Question-6. How is Eiffel different from other OOP languages?
Answer-6: Eiffel emphasizes DbC, multiple inheritance, and generic programming.
Question-7. What is a class in Eiffel?
Answer-7: A class is a blueprint for creating objects, containing attributes and methods.
Question-8. How do you define a class in Eiffel?
Answer-8: Use the class keyword, e.g., class PERSON.
Question-9. What is an attribute in Eiffel?
Answer-9: Attributes are variables that define the state of a class.
Question-10. How do you declare an attribute in Eiffel?
Answer-10: Use the form attribute_name: TYPE, e.g., name: STRING.
Question-11. What is a feature in Eiffel?
Answer-11: A feature is a class element, such as a method or attribute.
Question-12. How do you define a method in Eiffel?
Answer-12: Use the syntax method_name(arg: TYPE): RETURN_TYPE is do ... end.
Question-13. What is the role of the do keyword in Eiffel?
Answer-13: do marks the beginning of a method's implementation.
Question-14. What are preconditions in Eiffel?
Answer-14: Preconditions specify conditions that must be true before a method is executed.
Question-15. How are preconditions defined in Eiffel?
Answer-15: Use the require keyword, e.g., require x > 0.
Question-16. What are postconditions in Eiffel?
Answer-16: Postconditions specify conditions that must be true after a method executes.
Question-17. How are postconditions defined in Eiffel?
Answer-17: Use the ensure keyword, e.g., ensure result > 0.
Question-18. What is an invariant in Eiffel?
Answer-18: An invariant is a condition that must always hold true for a class.
Question-19. How do you define an invariant in Eiffel?
Answer-19: Use the invariant keyword, e.g., invariant count >= 0.
Question-20. What is multiple inheritance in Eiffel?
Answer-20: Eiffel allows a class to inherit from multiple parent classes.
Question-21. How do you define inheritance in Eiffel?
Answer-21: Use the inherit keyword, e.g., inherit PARENT_CLASS.
Question-22. What is renaming in Eiffel?
Answer-22: Renaming allows you to change the name of an inherited feature.
Question-23. How do you rename a feature in Eiffel?
Answer-23: Use the rename clause, e.g., rename old_name as new_name.
Question-24. What are generic classes in Eiffel?
Answer-24: Generic classes allow you to define classes that operate on different types.
Question-25. How do you define a generic class in Eiffel?
Answer-25: Use angle brackets, e.g., class STACK [G].
Question-26. What is polymorphism in Eiffel?
Answer-26: Polymorphism allows methods to behave differently based on the object's class.
Question-27. How does Eiffel handle memory management?
Answer-27: Eiffel uses automatic garbage collection.
Question-28. What is the create keyword in Eiffel?
Answer-28: create is used to initialize an object, e.g., create obj.
Question-29. What is an agent in Eiffel?
Answer-29: Agents are references to routines, allowing methods to be passed as arguments.
Question-30. How do you create an agent in Eiffel?
Answer-30: Use the agent keyword, e.g., agent my_method.
Question-31. What is the Current keyword in Eiffel?
Answer-31: Current refers to the current instance of a class.
Question-32. What is the role of the deferred keyword in Eiffel?
Answer-32: deferred defines an abstract class or method.
Question-33. How do you implement a deferred method in Eiffel?
Answer-33: Use deferred in the parent class and implement it in a descendant class.
Question-34. What is the purpose of the once keyword in Eiffel?
Answer-34: once ensures a method is executed only once per application run.
Question-35. How do you define a constant in Eiffel?
Answer-35: Use the once keyword, e.g., pi: REAL is once 3.14159.
Question-36. What is an expanded type in Eiffel?
Answer-36: Expanded types are value types, as opposed to reference types.
Question-37. How do you define an expanded type in Eiffel?
Answer-37: Use the expanded keyword, e.g., expanded INTEGER.
Question-38. What is the Eiffel Base Library?
Answer-38: The Base Library is a standard set of classes for common programming tasks.
Question-39. How do you handle exceptions in Eiffel?
Answer-39: Use the rescue clause in a method, e.g., rescue ....
Question-40. What is the role of the ensure keyword in Eiffel?
Answer-40: ensure defines postconditions for a method.
Question-41. What is the EiffelVision library?
Answer-41: EiffelVision is a library for creating graphical user interfaces (GUIs).
Question-42. What is the role of external in Eiffel?
Answer-42: external integrates Eiffel with external libraries or code.
Question-43. What is the purpose of the alias keyword?
Answer-43: alias allows you to assign alternative names to operators or routines.
Question-44. What is the root class in Eiffel?
Answer-44: ANY is the root class from which all other classes inherit.
Question-45. How do you compare objects in Eiffel?
Answer-45: Use the = operator for structural equality.
Question-46. What is an Eiffel cluster?
Answer-46: A cluster is a group of related classes, similar to a package.
Question-47. What are some tools provided with Eiffel?
Answer-47: Tools include EiffelStudio, EiffelBuild, and EiffelEnvision.
Question-48. What is EiffelStudio?
Answer-48: EiffelStudio is an Integrated Development Environment (IDE) for Eiffel programming.
Question-49. What are frozen features in Eiffel?
Answer-49: Frozen features cannot be overridden in descendant classes.
Question-50. How does Eiffel promote software reliability?
Answer-50: Eiffel uses DbC, strong typing, and exception handling to ensure software reliability.
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