The Function-ID paragraph specifies the name by which a function is
identified and assigns selected attributes to that function.
General Format


Syntax Rules
- Literal-1 must be an alphanumeric literal and must not be a
figurative constant.
General Rules
- User-function-name-1 names the function declared by this function
definition. However, literal-1, if specified, is the name of the function that
is externalized to the operating environment.
- Function-prototype-name-1 names the function prototype declared
by this definition. However, literal-1, if specified, is the name of the
function prototype that is externalized to the operating environment.