Naming the function

In general, function names have the same rules for variables: they must begin with a letter or an underscore and cannot contain spaces or other punctuation characters. Following the general principle of self-documenting code, you should name the function according to what it does. There is one exception and these are the special functions used to provide overloads for operators (which are mostly punctuation symbols). These functions have a name in the form of operatorx, where x is the operator that you will use in your code. A later section will explain how to implement operators with global functions.

Operators are one example of overloading. You can overload any function, that is, use the same name but provide implementations with different parameter types or different numbers of parameters.