What is Friend function, Getter setter, Static variable and static function with implementation

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Friend function is a function that is not a member of a class but has access to its private and protected members. Getter setter are methods used to access and modify private variables. Static variables are shared among all instances of a class. Static functions are functions that can be called without an instance of the class.

Friend function allows external functions to access private and protected members of a class.
Getter setter methods are used to get and set the values of private variables in a controlled manner.
Static variables are shared among all instances of a class and retain their value between function calls.
Static functions can be called without an instance of the class and are commonly used for utility functions.

What is Friend function, Getter setter, Static variable and static function with implementation

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