Yes, there can be friend functions in C++.
No, they are functions. Operators are -> or ++or /=
Of course they are used. Both stand-alone and class-member functions are used in C++.
In C++, methods are simply class member functions.
One.
It should work without any special action.
Turn on the intellisense feature.
C++ built-in functions are those functions that are provided for you as part of the language itself, and includes all of the C standard library functions (all of which were inherited from C) and is expanded upon by the C++ standard template library. C++ implementors may provide additional functions that are platform-specific, however these are not considered built-in functions becuase C++ is a cross-platform language. These are best described as 3rd party functions. The functions you yourself write are known as user-defined functions.
A singleton.
Constant data and constant functions.
The C++ standard library contains all the pre-defined functions.
Put their names into the parameter-list.
Something like this: