From:	Martin Chan <s987517 AT mailserv DOT cuhk DOT edu DOT hk>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Memory allocation
Date:	Mon, 07 Feb 2000 21:16:37 +0800
Organization:	CUHK
Lines:	34
Message-ID:	<389EC5B4.AA3D2666@mailserv.cuhk.edu.hk>
NNTP-Posting-Host:	dialup3-181.csc.cuhk.edu.hk
Mime-Version:	1.0
X-Trace:	justice.csc.cuhk.edu.hk 949929175 13601 137.189.210.181 (7 Feb 2000 13:12:55 GMT)
X-Complaints-To:	abuse AT cuhk DOT edu DOT hk
NNTP-Posting-Date:	7 Feb 2000 13:12:55 GMT
X-Mailer:	Mozilla 4.7 [en] (Win95; I)
X-Accept-Language:	en
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Hi.
I define a structure as below:

typedef struct
{
    int col, row;
    double **array;
} *Matrix;

Matrix transposed_matrix ;
int col, i, row;

and then create a 2-D dynamic array as below:

transposed_matrix->array=(double**)calloc(row, sizeof(double*);
--(transposed_matrix->array);    /*offset pointer*/

for(i=1; i<=col; i++)
{
    transposed_matrix->array[i]=(double*)calloc(col, sizeof(double));
    --(transposed_matrix->array[i]);   /*offset pointer*/
}

Then, when I try to free the dynamic array as below:

for(i=1; i<=col; i++)
    free(transposed_matrix->array[i]+1)
free(transposed_matrix->array+1);

General Protection Exception error happens.
I am puzzled. Thanks for any help.

- Raw text -