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From: sven@cs.widener.edu (Sven Heinicke)
Newsgroups: comp.lang.c
Subject: struct {int **i}; problem
Message-ID: <1991Mar23.213414.12572@cs.widener.edu>
Date: 23 Mar 91 21:34:14 GMT
Organization: Widener CS Dept
Lines: 58
Nntp-Posting-Host: ashley.cs.widener.edu

I got a little double integer pointer in a structure problem while in a
subprogram problem.  I think I have got everyting but one line down but 
I am not 100% sure about the malloc() line either.  Here is the extract
of the code I am working on:

.
.
.
struct imatrix {
  char **board;
  int size;
};
typedef struct imatrix iMATRIX;

main()
{
  int l;
  iMATRIX playing;
.
.
.
  /*
   * here are the three malloc() lines I am
   * not sure work right but I think do.
   * playing.size is picked bye the user.
   */
  playing.board = (int**)malloc(sizeof(int *) * playing.size * playing.size); 
  for(l = 0;l < playing.size * playing.size;l++)
    *(playing.board) = (int*)malloc(sizeof(int));

  reset(&playing);
.
.
.
}

reset(matrix)
     iMATRIX *matrix;
{
  int x,y;

  for(x = 0;x < matrix->size;x++)
    for(y = 0;y < matrix->size;y++)
      (*(matrix->board+x)+y) = x * matrix->size + y + 1;
  /*
   * This in the line that I got confused about, 
   * it don't compile.  In gnu c it gets the error:
   *           invalid lvalue in assigment
   *
   * could somebody tell me what line to use?
   *
   */
}

-- 
sven@cs.widener.edu                                  Widener CS system manager
Sven Mike Heinicke                                          and Student
(pssmheinicke@cyber.widener.edu (if you must))