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Questions and Answers
What is the purpose of a constructor in a class?
What is the type of the data member count in the Counter class?
What is the purpose of the inc_count() function in the Counter class?
What is the purpose of the get_count() function in the Counter class?
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What happens when an object of the Counter class is created?
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What is the role of a constructor in automatic initialization?
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What is the purpose of the Counter class?
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What is the difference between a constructor and a destructor?
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What is the purpose of overloading constructors?
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What is the purpose of defining member functions outside the class?
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Study Notes
Constructors
- A constructor is a special member function that is executed automatically whenever an object is created.
- It allows an object to initialize itself when it's first created, without requiring a separate call to a member function.
- Constructors are used for automatic initialization of objects.
Default Constructor
- A default constructor is a constructor with no parameters.
- In the Counter class, the default constructor
Counter() : count(0)initializes the count to 0.
Counter Example
- The Counter class is an example of a class that might be useful as a general-purpose programming element.
- A counter is a variable that counts things, such as file accesses, user presses, or customer entries.
- The Counter class has one data member:
countof typeunsigned int. - The class has three member functions:
- The constructor
Counter()to initialize the count. -
inc_count()to increment the count. -
get_count()to return the current value of the count.
- The constructor
Member Functions
-
inc_count()is a member function that adds 1 to the count. -
get_count()is a member function that returns the current value of the count.
Classes and Structures
- Classes and structures are similar, but with some differences (to be discussed later).
Overloaded Constructors
- Overloaded constructors are not discussed in this lecture, but will be covered later.
Member Functions Defined Outside the Class
- Member functions can be defined outside the class definition, but will be covered later.
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Description
Learn about constructors and destructors in programming, including default constructors, overloaded constructors, and member functions defined outside the class.
