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
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To: djgpp AT delorie DOT com
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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.