NetNews Usenet Archive 1992 #26/NN_1992_26.iso/spool/comp/lang/c/16165

Internet Message Format | 1992-11-08 | 1.7 KB

Path: sparky!uunet!gatech!usenet.ins.cwru.edu!agate!dog.ee.lbl.gov!horse.ee.lbl.gov!torek
From: [e-mail] (Chris Torek)
Newsgroups: comp.lang.c
Subject: passing 2-dimensional arrays (was Someone help me with this)
Date: 8 Nov 1992 09:41:58 GMT
Organization: Lawrence Berkeley Laboratory, Berkeley
Lines: 34
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
Reply-To: [e-mail] (Chris Torek)
NNTP-Posting-Host: 128.3.112.15

(Note: Please use descriptive subject lines.  `Help me with this' is
generally not very descriptive.)

In article <[e-mail]>
[e-mail] (Robert Horn) points out that declarations
of the form

    t1 f(t2 v[][])

(where t1 and t2 are types, f is a function name, and v is a variable
name) are illegal in C.  Further correct information can be found in
the comp.lang.c FAQ.

>... your example: char timetab[33][31] specifies an array from 0
>    to 30 of arrays 0 to 32 of characters.

This is backwards: the definition[%]

    char timetab[33][31];

declares timetab as an object of type `array 33 of array 31 of char'.
Each of the first `array's (each timetab[i] such that 0 <= i < 33) is
itself an <object, array 31 of char> and thus for each one, you can
write timetab[i][j], where j >= 0 and j < 31.
-----
% I say `definition' here to avoid the issue of formal parameter
  declarations (which are not definitions, and which act funny when
  told that a formal parameter has an array type).
-----

Again, see the FAQ for more detail.
--
In-Real-Life: Chris Torek, Lawrence Berkeley Lab CSE/EE ([phone])
Berkeley, CA        Domain:    [e-mail]