Scanner


Else, it is an Identifier (or is it?)
{L}({L}|{D})*           { count(); return(check_type()); }

Some "type recognition" done at this (lex) level.
Basically allows us to decide whether something is a type or an
identifier right here, makes the job of the parser easier.

int check_type() {
Lookup symbol table for identifier
if (a typedef which is found in table)
return TYPEDEF;
else
return IDENTIFIER;
}