RES: [Dev-C++] pointers of pointers structures memory allocation

[<and...@su...>]

<<This>> is what I like this list!!!
objetive answers and useful discussions

Thank you all
Andre

-----Mensagem original-----
De: Ricardo Lopez Ruiz [mailto:ri...@po...]
Enviada em: sexta-feira, 21 de marco de 2003 07:03
Para: Andre Macario Barros; Dev-C++
Assunto: Re: [Dev-C++] pointers of pointers structures memory allocation


Essentially you want to allocate memory for a char matrix in a dynamical 
way.

(1) First you must allocate memory for the rows.
Imagine you need to store 50 strings, then p should point
to a pointer array able to allocate the 50 memory positions
of your 50 strings:

      p = (char **) malloc(50*sizeof(char*));

(2) Second you want allocate in each row a string with a maximum
of 80 characters, then you should reserve this memory:

    for(i=0 ; i<50 ; i++)
              p[i] = (char *) malloc(80*sizeof(char));

(3) Now tou can store your strings:

   for(i=0 ; i<50 ; i++)   
  {
        printf("\n Give me a char string: ");
        gets(p[i]);
  }    

(4) Finally you free the allocated memory in this way:

          for(i=0 ; i<50 ; i++)  free(p[i]);
          free (p);
     

Hope this can help you.
Ricardo.