Use of Scope resolution operator in C++
C++ introduces a new operator called Scope Resolution Operator.
It is Represented by :: ( double colon)
The scope resolution operator ( :: ) is used for several reasons.
1. To access the global variable
2. To define a member function outside the class.
3. To initialize or access the static variable
Use 1: To access Global Variable
C++ is also a block structured Language.
The same variable name can be used to have different meanings in different blocks.
The variable declared inside a block is said to be local to that block.
Suppose - In your Program , If the global variable name is same as local variable name then the global variable name can be accessed by using scope resolution operator.
Use 2: To define member function outside the class
Class is a collection of Data and functions.
Class specification has two parts.
1. Class declarations
2. Class function definitions.
The member functions can be defined in two ways.
1. Outside the class definition.
2. Inside the class definition.
Use 3: To access static data member in a class
In a class, If a variable is declared as static then it is known as static data member.
The type and scope of each static member variable must be defined outside the class.
It can be accessed by scope resolution operator.
General form is
Data-type class-name : : variable-name = value;
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