COP 3330 Midterm Exam Questions and Answers Already Passed Latest Update

COP 3330 Midterm Exam Questions and Answers Already Passed Latest Update Objects consist of: - Answers Type - what class was used to create this object Name - an identifier that can be used with a program to distinguish one object from another created with the same class Member data - the STATE of the object Member function - the BEHAVIOR of the object DDU Design - Answers "Declare, Define, Use" Declare- Declarations specify an interface, which illustrates the "shape" of a class Define- Definitions specify implementation details Use- Interacting with the interface to perform a function We can declare member data (state) or member functions (behavior) as: - Answers PUBLIC- can be accessed from outside of an object PRIVATE- can only be access from within an object "Users" do NOT have access to private members, which are related to implementation details they shouldn't have to care about What members make up its interface? - Answers the PUBLIC members What members make up the part of your code that only the authors of the class can see? - Answers the PRIVATE members What should the "default" protection level of object members be? - Answers private members Why are private members referred to as "hidden" - Answers code that uses an object cannot "see" those members Why hide data? - Answers 1. Simplify object usage for the users 2. Minimize information requirements - what if the entire electrical specification for your house was available to everyone who wanted to plug in a lamp? 3. Security - what if anyone who wanted to plug in the lamp had access to the breaker and could turn off your electricity 4. Decoupling* - What if every time lamp technology improved you had to renovate your house? Why hide data? - Answers What does a class declaration do? - Answers gives interface to the users of the class - shows (1) what an object will look like and (2) what its available functions are - no implementation details - each variable declaration specifies its type - each function declaration tells you how to use it (not how it works!) give an example of a class declaration (dog.h) - Answers #include string using namespace std; class Dog { public: //public behavior Dog(); void Bark(); void WagTail(); void Sit(); //public state string Name; string FurColor; string Temperament; private: bool isSitting; // private data and function member declarations }; A class definition contains.... - Answers implementation details - the user of the class will not see this part - A function definition IS the code(!) that makes the function work (the function body) - a class definition consists of definitions of its member functions give an example of a class definition () - Answers #include "dog.h" #include iostream #include string using namespace std;