RE: [Dev-C++] Correct use of pointers

[Somanathan K. <som...@wi...>]

I couldn't understand how the first one will work(without allocating =
memory
for p). This should crash soon or later.

Somanathan

-----Original Message-----
From: Andr=E9 Mac=E1rio Barros [mailto:and...@su...]=20
Sent: Friday, March 14, 2003 6:16 AM
To: Dev-Cpp-Users
Subject: [Dev-C++] Correct use of pointers

Gentlemen,

   Even in the Ritchie=B4s books sometimes I fount .C codes using "wild
pointers" or something
like:
****************
void main()
{
   int *p, a, b;

   a=3D2;
   b=3D3;
   *p =3D a + b;

   ...
}
****************
But... in large programs we can have problems.

   Would I be corret, allways, if I use insted a code like:
*********************
#include <stdlib.h> /* or alloc.h */

void main()
{
   int *p, a, b;

   p=3Dmalloc(1*sizeof(int));
   a=3D2;
   b=3D3;
   *p =3D a + b;
   ...
   free(p);
}
******************
1. It=B4s not necessary, but is it tecnically correct?
2. Is there any point, where the previous memory allocation is =
mandatory?

Thanks
Andre




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