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Re: How to passing multidimesional array of string to function?

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On 2012-07-24, Alter <no@alt.invalid> wrote:
> This type of array:
>
> char *word[50][50]={{"123", "3048548t", "fd?fkd9ds8","0"," ",...},...}
>
> As it passed to the function?
>
> Must be written as the prototype of the function, and should be used?

Please read chapter 6 of the C FAQ if you haven't already done so.

Now, here's one possibility:

/* begin example0.c */

#include <string.h>
#include <assert.h>

static void check(char *word[][50], int row, int col, char const *expect)
{
  assert(0 == strcmp(word[row][col], expect));
}

int main(void)
{
  char *word[50][50] = {{"0:0"}, {"1:0", "1:1", "1:2"}, {"2:0", "2:1"}};
  check(word, 1, 2, "1:2");
  check(word, 2, 1, "2:1");
  return 0;
}

/* end example0.c */


Here's another possibilty, using variable length arrays
(works with C99 or newer).
It has the advantage that you can use the function for any
two-dimensional array of strings, regardless the size.

/* begin example1.c */

#include <string.h>
#include <assert.h>

static void check(int nrows, int ncols, char *word[nrows][ncols],
  int row, int col, char const *expect)
{
  assert(0 == strcmp(word[row][col], expect));
}

int main(void)
{
  char *word[50][50] = {{"0:0"}, {"1:0", "1:1", "1:2"}, {"2:0", "2:1"}};
  check(50, 50, word, 1, 2, "1:2");
  check(50, 50, word, 2, 1, "2:1");
  return 0;
}

/* end example1.c */


Here's another one, that adds a level of indirection, so that
a pointer to the array is passed, instead of passing the array.
The advantage is that the compiler will verify that both dimensions
of the passed array match exactly.

/* begin example2.c */

#include <string.h>
#include <assert.h>

static void check(char *(*word)[50][50], int row, int col, char const *expect)
{
  assert(0 == strcmp((*word)[row][col], expect));
}

int main(void)
{
  char *word[50][50] = {{"0:0"}, {"1:0", "1:1", "1:2"}, {"2:0", "2:1"}};
  check(&word, 1, 2, "1:2");
  check(&word, 2, 1, "2:1");
  return 0;
}

/* end example2.c */

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How to passing multidimesional array of string to function? "Alter" <no@alt.invalid> - 2012-07-23 13:53 +0200
  Re: How to passing multidimesional array of string to function? Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-07-23 08:54 -0400
    Re: How to passing multidimesional array of string to function? "Alter" <no@alt.invalid> - 2012-07-24 19:08 +0200
      Re: How to passing multidimesional array of string to function? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-07-24 18:28 +0100
        Re: How to passing multidimesional array of string to function? "Alter" <no@alt.invalid> - 2012-07-24 21:40 +0200
          Re: How to passing multidimesional array of string to function? Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-07-24 13:16 -0700
            Re: How to passing multidimesional array of string to function? Fred K <fred.l.kleinschmidt@gmail.com> - 2012-07-24 13:22 -0700
              Re: How to passing multidimesional array of string to function? Fred K <fred.l.kleinschmidt@gmail.com> - 2012-07-24 13:22 -0700
            Re: How to passing multidimesional array of string to function? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-07-24 22:19 +0100
            Re: How to passing multidimesional array of string to function? Stephen Sprunk <stephen@sprunk.org> - 2012-07-24 19:45 -0500
          Re: How to passing multidimesional array of string to function? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-07-24 22:07 +0100
      Re: How to passing multidimesional array of string to function? Ike Naar <ike@iceland.freeshell.org> - 2012-07-24 18:16 +0000
  Re: How to passing multidimesional array of string to function? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-07-23 14:07 +0100
  Re: How to passing multidimesional array of string to function? Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-07-23 08:05 -0700
  Re: How to passing multidimesional array of string to function? pete <pfiland@mindspring.com> - 2012-07-23 22:51 -0400
  Re: How to passing multidimesional array of string to function? Varun Tewari <tewari.varun@gmail.com> - 2012-07-24 10:21 -0700
    Re: How to passing multidimesional array of string to function? Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-07-24 13:50 -0400
      Re: How to passing multidimesional array of string to function? C3PO <nospam@nospam.com> - 2012-07-28 20:41 +0000
        Re: How to passing multidimesional array of string to function? Keith Thompson <kst-u@mib.org> - 2012-07-28 15:04 -0700
        Re: How to passing multidimesional array of string to function? Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-07-28 22:07 -0400
        Re: How to passing multidimesional array of string to function? Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2012-07-29 11:33 +0300
  Re: How to passing multidimesional array of string to function? aftnix <aftnix@gmail.com> - 2012-07-26 13:35 -0700
  Re: How to passing multidimesional array of string to function? Barry Schwarz <schwarz45@yahoo.com> - 2012-07-27 15:05 -0700

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