12 Lecture - ACCESSING STATIC DATA MEMBER

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12 Lecture

CS304

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ACCESSING STATIC DATA MEMBER

Static data members are shared among all objects of a class and can be accessed without creating an instance of the class. They are declared using the static keyword and can be accessed using the class name followed by the scope resolution opera


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  1. What is a static data member in C++? a) A data member that can only be accessed by member functions b) A data member that can be accessed by any function or method within the class c) A data member that is unique to each instance of a class d) A data member that is declared using the const keyword Answer: b How is a static data member declared in C++? a) Using the const keyword b) Using the static keyword c) Using the public keyword d) Using the friend keyword Answer: b How is a static data member accessed in C++? a) Using the object name followed by the dot operator b) Using the object name followed by the arrow operator c) Using the class name followed by the dot operator d) Using the class name followed by the arrow operator Answer: c Which of the following statements is true about static data members? a) They are unique to each instance of a class b) They can only be accessed by member functions c) They are shared among all objects of a class d) They are declared using the const keyword Answer: c What is the default value of a static data member in C++? a) 0 b) 1 c) Null d) Undefined Answer: a What is the scope of a static data member in C++? a) Global scope b) Local scope c) Class scope d) Namespace scope Answer: c What is the lifetime of a static data member in C++? a) Until the end of the program b) Until the end of the function in which it is declared c) Until the object is destroyed d) Until it is explicitly deleted Answer: a How many instances of a static data member are there in a class? a) One for each instance of the class b) One for all instances of the class c) One for each member function d) None of the above Answer: b Which keyword is used to access a static data member outside the class in C++? a) private b) public c) static d) friend Answer: c Can a static data member be modified by a non-static member function? a) Yes b) No Answer: a


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  1. What is a static data member, and how is it different from a regular data member in C++? Answer: A static data member is a data member that is shared among all objects of a class and can be accessed without creating an instance of the class. It is declared using the static keyword and has a single storage location that is initialized to zero. The main difference between a static and regular data member is that the static data member is not associated with a particular instance of the class, whereas a regular data member is. How is a static data member initialized in C++? Answer: A static data member can be initialized using a static member initializer, which is a constant expression. Alternatively, it can be initialized using a static member function that returns a value of the appropriate type. Can a static data member be initialized in the constructor of a class in C++? Answer: No, a static data member cannot be initialized in the constructor of a class in C++. This is because the static data member is associated with the class itself, not with any particular instance of the class. How is a static data member accessed outside the class in C++? Answer: A static data member can be accessed outside the class using the scope resolution operator (::) followed by the name of the class and the name of the static data member. Can a static data member be accessed using an instance of the class in C++? Answer: Yes, a static data member can be accessed using an instance of the class, but it is not recommended because it is misleading and can cause confusion. How is a static data member declared in a class in C++? Answer: A static data member is declared using the static keyword before the data member declaration in the class definition. Can a static data member be of any data type in C++? Answer: Yes, a static data member can be of any data type in C++, including built-in data types, user-defined data types, and pointer types. Can a static data member be declared as const in C++? Answer: Yes, a static data member can be declared as const in C++ by using the const keyword before the data member declaration in the class definition. How is a static data member accessed within the class in C++? Answer: A static data member can be accessed within the class using the class name followed by the scope resolution operator (::) and the name of the static data member. Can a static data member be declared as private in C++? Answer: Yes, a static data member can be declared as private in C++ to restrict its access to the member functions of the class.

In object-oriented programming, a class is a blueprint that defines the behavior and structure of objects of a certain type. A class contains data members and member functions that manipulate the data members. A static data member is a data member that is shared among all objects of a class and is not associated with any particular instance of the class. To declare a static data member in C++, the static keyword is used before the data member declaration in the class definition. A static data member has a single storage location that is initialized to zero by default. It can also be initialized using a static member initializer or a static member function. A static data member is accessed outside the class using the scope resolution operator (::) followed by the name of the class and the name of the static data member. It can also be accessed within the class using the class name followed by the scope resolution operator (::) and the name of the static data member. A static data member has a class scope, which means that it is visible to all member functions of the class and can be accessed without creating an instance of the class. It has a global lifetime, which means that it exists throughout the execution of the program. Static data members are useful for maintaining information that is shared among all objects of a class, such as a counter that keeps track of the number of objects that have been created from the class. They can also be used to store information that is constant across all instances of the class, such as a conversion factor or a default value. In conclusion, static data members in C++ are a powerful feature that can be used to maintain and manipulate data that is shared among all objects of a class. They have a unique scope, lifetime, and access mechanism, which makes them a useful tool for writing efficient and effective code.

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