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multi dimensional arrays

Posted on 1999-07-22
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Last Modified: 2010-04-15
int n[5];

void func( int * pn )
{ .... }

func( n );

this is clear.
What to write in the 'func()' call in that case:

int n[5][5];

void func( int ** ppn )
{ .... }

func( ???? );

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Question by:dib
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Author Comment

by:dib
ID: 1263787
Edited text of question.
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Accepted Solution

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rbr earned 200 total points
ID: 1263788
void func (int arr[][5])

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Expert Comment

by:rbr
ID: 1263789
You have to know at the number of cols of your matrix. Another better way if the dimensions differs and you want to use the same function sveral times is to use the following structure

struct my_arr {
      size_t rows;
      size_t cols;
      int **pparr;
}

struct my_arr *init_array (size_t cols,size_t rows)
{
      struct my_arr *parr;
     int i;

      parr = calloc (1,sizeof (struct my_arr));
      parr->cols=cols;
      parr->rows=rows;

     parr->pparr = calloc (cols,sizeof (int *));
     
     for (i=0;i<rows;i++)       {
            parr->pparr[i] = calloc (rows, sizeof (int));
      }
      return (parr);
}
void clear_array (struct my_arr *parr)
{
      int i;
         for (i=0;i<parr->rows;i++)       {
            free(parr->pparr[i])
      }
      free (parr->pparr);
      free (parr);
}

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