Function declarators consist of the following elements:
- An identifier, or name
- Parameter declarations, which specify the parameters that can be passed to the function in a function call.
Function declarator syntax >>-identifier--(--+-----------------------+--)----------------->< '-parameter_declaration-'
Note: More complex types might be
formed by using the syntax of direct_declarator in
place of identifier. For the details of direct_declarator,
see Overview of declarators.