Re: [Dev-C++] Hello

[Jason H. <jas...@bt...>]

I'm afraid I can't offer you much help with OpenGL and those tutorials, =
but I do know something about "free()".

When programming in C you use free() allong with malloc() to dynamically =
create and *free* up memory. If you want to learn more about dynamic =
allocation you should read a good C/C++ book. Any C book should explain =
more about malloc() and free().

From what you have said it sounds like you need to include <stdlib.h>, =
which is where those functions are declared. If it is already defined =
then the problem is elsewhere.

As for alternatives... if you are using C++ (as aposed to pure C) then =
you can use the dynamic allocation functions that are part of the C++ =
language, which are new() and delete(). Again any good C++ book will =
explain these. Using malloc() and free() is still valid in C++ (and you =
can use the header <cstdlib> instead of <stdlib.h>), but new() and =
delete() are better because of the way they are designed to handle =
pointers and datatypes as part of the language.

i.e.

int *p;
p =3D new int[10]; // create an int array

for(int i=3D0; i<10; ++i)
    p[i] =3D i*i; // fill array with square of 0 through to 9.

for(int i=3D0; i<10; ++i)
    cout << p[i] << endl; // display contents of dynamic array.
        // don't forget need to include <iostream> to use cout etc...

delete p; // always free up memory or you will get a memory leak!!!
...

This is just a quickie I created off the top of my head, so it probably =
won't work ;-) I'm too lazy to actualy test it.

p =3D new int[10];

is the same as

p =3D (int*) malloc(10*sizeof(int));

in C.

delete p;

is the same as

free(p);

in C.

Just remember you cannot use one malloc() with delete() and new() with =
free().... they don't mix.

Hope this helps, and anyone else feel free to point out any mistakes I =
may have made.

Jason.
  ----- Original Message -----=20
  From: Joseph, Brandi, & Elise VanPelt=20
  To: dev...@li...=20
  Sent: Saturday, September 15, 2001 11:38 PM
  Subject: [Dev-C++] Hello


  Hello all,
      This is my first post to this list.  My name is Joseph, you can =
call me Blumojo (or "blu" or "mojo" for short).  I really like Dev-cpp =
and am thinking of sending a donation if I can get the following to =
work.  I am working on NeHe's OpenGL tutorials =
(http://nehe.gamedev.net/)  which are really good - even for a novice =
like me, but the code he gave was for Visual CPP.  I have worked through =
a couple of the problems, but have become "stumped" on lesson 7 where =
the compiler has given me:
  "implicit declaration of function int free()"
  In his explanation, this function is used to free memory used to store =
texture data.

      First of all, has anyone worked through these tutorials and ported =
them to Dev-CPP/MinGW?  If so, I would greatly appreciate the code to =
help me along.  Second, is there another (perhaps better) way to free =
this memory?

  Thank you all so much for the help!

  -Bumojo