Member functions can 642-901 (and should) be used to interact with data contained within user defined types. User defined types provide flexibility in thescheme in program writing. In other words, one programmer can write a user defined type and guarantee an interface. Another programmer can write the main program with that expected interface. The two pieces are put together and compiled for usage. User defined types provide encapsulation defined in the Object 650-621 Oriented Programming (OOP) paradigm.
Within classes, to protect the data members, the programmer can define functions to perform the operations on those data members. Member functions and functions are names used interchangeably in reference to classes. Function prototypes are declared within the class definition. These prototypes can take the form of non-class functions as well as class suitable prototypes. Functions can be declared and defined within the class 646-230 definition. However, most functions can have very large definitions and make the class very unreadable. Therefore it is possible to define the function outside of the class definition using the scope resolution operator
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