RE: [Dev-C++] Hello

[Ioannis V. <no...@ya...>]

I write this because you said to point out the mistakes. :)
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It is not new() and delete(), they are operators new and delete ( and
new[] and delete[]).
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Then in your code you do p=3Dnew int[10] and delete p; but it should be
delete[] p;
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Also new, new[],  delete and delete[] are better because you can define
what to do in memory allocation failure of new or new[] using
set_new_handler() and overiding them to define where to place their
objects (placement operators) in already allocated memory (even in the
stack), which is a bit advanced topic.
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Regards,
Ioannis
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* Ioannis Vranos
* Programming pages: http://www.noicys.f2s.com
<http://www.noicys.f2s.com/>=20
* Alternative URL: http://run.to/noicys

-----Original Message-----
From: dev...@li...
[mailto:dev...@li...] On Behalf Of Jason
Hardman
Sent: Sunday, September 16, 2001 1:42 AM
To: dev...@li...
Subject: Re: [Dev-C++] Hello


I'm afraid I can't offer you much help with OpenGL and those tutorials,
but I do know something about "free()".
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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().
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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.
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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.
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i.e.
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int *p;
p =3D new int[10]; // create an int array
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for(int i=3D0; i<10; ++i)
    p[i] =3D i*i; // fill array with square of 0 through to 9.
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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...
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delete p; // always free up memory or you will get a memory leak!!!
...
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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.
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p =3D new int[10];
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is the same as
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p =3D (int*) malloc(10*sizeof(int));
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in C.
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delete p;
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is the same as
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free(p);
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in C.
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Just remember you cannot use one malloc() with delete() and new() with
free().... they don't mix.
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Hope this helps, and anyone else feel free to point out any mistakes I
may have made.
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Jason.

----- Original Message -----=20
From: Joseph,  <mailto:bl...@ho...> 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.
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    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?
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Thank you all so much for the help!
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-Bumojo