How to parse char **argv?

Hello,


            I have actually three questions, all related to the parsing of
C/C++:




Question 1:


Reading Section 5.2 of Brian and Dennis's The C Programming Language,
I tried to parse the following with the syntax rules defined in A8.5:


The rules in the book:


declarator:
          pointer OPT direct-declarator


direct-declarator:
          identifier
          ( declarator )
          direct-declarator [ constant-expression OPT ]
          direct-declarator ( parameter-type-list )
          direct-declarator ( identifier-list OPT )




The parse I tried:


char * * argv
                | | |
                | | identifer
                | | |
                | | direct-declarator
                | | |
                | -- declarator
                | |
                ------ ???


          My first question is: which grammer rule is it used for the last
line (???)?






Question 2:
In r.17.4 of Bjarne Stroustrup's The C++ Programming Language (second
edition)


It has the rules as:


declarator:
dname
ptr-operator declarator
declarator ( argument-declaration-list ) cv-qualifer-list OPT
                declarator [ constant-expression OPT ]
( declarator )




      With these rules, I found that the following parse seems to be
derived:


int * daytab [13]
        | | |
  pointer dname |
        | | |
        | declarator |
        | | |
        -----declarator |
                      | |
                  declarator----


      But it is different from what I expected with rules of A8.3 of
Brian's book.


int * daytab [13]
        | | |
  pointer dname |
        | | |
        | declarator----
        | |
        -----declarator






        What is the correct parsing and what rules should be used?




Question 3:


How are precedence (of operators ) defined in C 's grammar? Is it
defined implicitly with the ordering of the grammar rules? [Yes, -John]


For instance, books said that [] has a higher precedence than * in
*daytab[13], how is it defined in C language?


      All advice and comments are welcomed. Thanks in advance for your
response. And please cc to my e-mail supercat@planet.net.hk as well.


      Regards,
      Raymond Li Cheuk Fai, supercat@planet.net.hk
--

Return to the comp.compilers page.
Search the comp.compilers archives again.