dev-cpp-users — Dev-C++ users discussion list

RE: [Dev-C++] recursion

[Per W. <pw...@ia...>]

I think you got a bit confused about terminology.

Looping and iteration is actually the same thing.

However, recursion is not anything that should be specifically avoided.
It's a question of what problem to solve.

The trivial example of the faculty function seems to be the most quoted
example for the use of a loop instead of recursion, but the example is
quite bad, since it's faculty is easier to implement and runds faster as a
loop.

There are matematical rules that makes it possible to rewrite any
iterative function into a recursive function. And in the same way, any
recursive function may be converted to use state queues to store the
recursive state.

Use recursion when recursion results in faster run-time, or an easier
implementation. In other cases, select an iterative approach.

Examples where recursion faster and/or easier:
- light-tree evaluation in a ray tracer.
- parsing of mathematical expressions
- some recursively defined functions, such as Ackerman
- regular expression pattern matching


/Per W

On Fri, 14 Feb 2003, Jaap de Wolff wrote:

>
>
> > -----Original Message-----
> > From: Ioannis Vranos [mailto:no...@ho...]
> > Sent: Friday, February 14, 2003 07:25 AM
> > To: dev...@li...
> > Subject: Re: [Dev-C++] recursion
> >
> >
> > -------Original Message-------
> >
> > From: Santiago
> > Date: =D0=E1=F1=E1=F3=EA=E5=F5=DE, 14 =D6=E5=E2=F1=EF=F5=DC=F1=E9=EF=F2=
 2003 5:53:20 =F0=EC
> > To: dev-cpp-users-list
> > Subject: [Dev-C++] recursion
> >
> > Hello all,
> > Simple one: how often, critical, and necessary is the usage
> > of C++ recursion
> > in the "real world" programming field?
> >
> >
> > =3D=3D> It has its uses, but try to avoid using it. Use loops
> > instead (usually
> > iteration).
> >
> >
> >
> > Ioannis Vranos
>
> Iteration is usefull when you have to make more of the same (iterative)
> operations on the result of itself, before you have your result.
> A traditional example of anything which can't be solved without iteration=
 is
> the resolving of a regular expression.
> But of course there are more simple things which are far less complex usi=
ng
> iteration as by loops.
> As an example creating a hex string on stream.
>
> void ToHex(ostream &rstr, unsigned int n)
> {
> =09const char *HexChars =3D "0123456789ABCDEF";
> =09if (n >=3D 16)
> =09{
> =09=09ToHex(rstr, n/16);
> =09=09ToHex(rstr, n%16);
> =09}
> =09else
> =09{
> =09=09rstr << HexChars[n];
> =09}
> }
>
> Jaap
>
>
> -------------------------------------------------------
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>

RE: [Dev-C++] recursion

[Jaap de W. <wo...@Ne...>]

> -----Original Message-----
> From: Ioannis Vranos [mailto:no...@ho...]
> Sent: Friday, February 14, 2003 07:25 AM
> To: dev...@li...
> Subject: Re: [Dev-C++] recursion
>=20
>=20
> -------Original Message-------
> =20
> From: Santiago
> Date: =D0=E1=F1=E1=F3=EA=E5=F5=DE, 14 =
=D6=E5=E2=F1=EF=F5=DC=F1=E9=EF=F2 2003 5:53:20 =F0=EC
> To: dev-cpp-users-list
> Subject: [Dev-C++] recursion
> =20
> Hello all,
> Simple one: how often, critical, and necessary is the usage=20
> of C++ recursion
> in the "real world" programming field?
> =20
> =20
> =3D=3D> It has its uses, but try to avoid using it. Use loops=20
> instead (usually
> iteration).
> =20
> =20
> =20
> Ioannis Vranos

Iteration is usefull when you have to make more of the same (iterative)
operations on the result of itself, before you have your result.
A traditional example of anything which can't be solved without =
iteration is
the resolving of a regular expression.
But of course there are more simple things which are far less complex =
using
iteration as by loops.
As an example creating a hex string on stream.

void ToHex(ostream &rstr, unsigned int n)
{
	const char *HexChars =3D "0123456789ABCDEF";
	if (n >=3D 16)
	{
		ToHex(rstr, n/16);
		ToHex(rstr, n%16);
	}
	else
	{
		rstr << HexChars[n];
	}
}

Jaap=20

Re: [Dev-C++] Missing file "dev/gcc32.txt" and reading error messages

[Adam M. <up...@in...>]

Hi.
Maybe it's not on subject but when i used gcc3.2 to compile my old project
the EXE file was nearly 2 times biger then the old one.
Did anyone else observed such thing?

upanie.

----- Original Message -----
From: "Simon Langley" <s.l...@bl...>
To: <dev...@li...>
Sent: Friday, February 14, 2003 11:34 AM
Subject: [Dev-C++] Missing file "dev/gcc32.txt" and reading error messages


> Hi,
>
> The page http://www.bloodshed.net/dev/index.html contains a link to a file
> dev/gcc32.txt relating to incompatabilities with GCC 3.2 - unfortunately
the
> file doesn't seem to exist.  I'm using gcc 3.2 and the only problem I've
had
> is that only bits of some error messages get extracted by dev-cpp.  Is
there
> something more serious?
>
> By the way, there is an obvious work-round for the error message problem -
> don't make mistakes!
>
> Simon
>
>
>
> -------------------------------------------------------
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>
> ----------------------------------------------------------------------
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>
>
>

[Dev-C++] Missing file "dev/gcc32.txt" and reading error messages

[Simon L. <s.l...@bl...>]

Hi,

The page http://www.bloodshed.net/dev/index.html contains a link to a file
dev/gcc32.txt relating to incompatabilities with GCC 3.2 - unfortunately the
file doesn't seem to exist.  I'm using gcc 3.2 and the only problem I've had
is that only bits of some error messages get extracted by dev-cpp.  Is there
something more serious?

By the way, there is an obvious work-round for the error message problem -
don't make mistakes!

Simon

Re: [Dev-C++] recursion

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

-------Original Message-------=0D
 =0D
From: Santiago=0D
Date: =D0=E1=F1=E1=F3=EA=E5=F5=DE, 14 =D6=E5=E2=F1=EF=F5=DC=F1=E9=EF=F2 2=
003 5:53:20 =F0=EC=0D
To: dev-cpp-users-list=0D
Subject: [Dev-C++] recursion=0D
 =0D
Hello all,=0D
Simple one: how often, critical, and necessary is the usage of C++ recurs=
ion
in the "real world" programming field?=0D
 =0D
 =0D
=3D=3D> It has its uses, but try to avoid using it. Use loops instead (us=
ually
iteration).=0D
 =0D
 =0D
 =0D
Ioannis Vranos=0D
 =0D
* Programming pages: http://www.noicys.freeurl.com=0D
* Alternative URL: http://run.to/noicys=20

[Dev-C++] asm SEGment problem ?

[Johannes P. <joh...@pr...>]

Good day
-=0=0-=00--0

I have a C/asm related question that is puzzling me. If possible can 
somebody please give some input on it as I don't really have a clue
on where to go from here.

in the example below I add the SEGment of the handler function to the AX 
register.

//======================= SNIP START ===========================
void handler(void){
   return;
}

void main(void){
   asm{
     mov ax,SEG handler
   }
}
//==========8<============ SNIP END ===========================

with the dos.h and stdio.h this compiles with no problems at all.

But when changing this to a class as seen below.

//========================= SNIP START ========================

class te{
   private:
     int vga;
   protected:
     void handler_te(void);
   public:
     void init(void);
};

void te::handler_te(void){
   return 0;
}

void te::init(void){
   asm{
     mov ax,SEG this.handler_te
   }
}
//============= 8< ========== SNIP END ===========================

when compiling this with the same headers you get the following error.

Error SEGTEST.CPP 19: Undefined symbol 'handler_te'

This is confusing me as I don't know how to get around this.

Any input will be appreciated.

Thanks in Advance

Johannes Pretorius

[Dev-C++] update problem

[Richard J S. <st...@ri...>]

When I try to check for updates, I get the following message:

Error: Your devcpp.cfg file is missing

I have Dev C++ version 4.9.7.1

I have vUpdate v1.616

Any help would be appreciated.
Thanks.

------------------------------------------------------------------------
Richard J. Stoll, Professor of Political Science and
Associate Dean of Social Sciences * Rice University
Dept. Political Science MS 24 * P.O. Box 1892 * Houston TX 77251-1892
E-mail: st...@ri... * Tel: 713-348-3362 * FAX: 713-348-5273

[Dev-C++] recursion

[Santiago <sa...@ho...>]

Hello all,
Simple one: how often, critical, and necessary is the usage of C++ =
recursion in the "real world" programming field?

Thanks
San

Re: [Dev-C++] What the heck?!

[Luigi S. <gi...@li...>]

On Thu, Feb 13, 2003 at 08:43:34AM +0100, Jaap de Wolff wrote:
> Yes, the code you show here has correct syntax.
> I expect that somewhere in your include files there is a 
> #define small char.

Why would one need such a line, I've tried the following short
C program and it works.


enum_ex.c
---------
#include <stdio.h>

int
main()
{
	enum Size { SMALL, MEDIUM, LARGE, GIANT };
	
	puts("values used in the enumeration");
	printf("SMALL  = %d\n", SMALL);
	printf("MEDIUM = %d\n", MEDIUM);
	printf("LARGE  = %d\n", LARGE);
	printf("GIANT  = %d\n", GIANT);

	return 0;
}

> Just replace small by GranoBlasticSmall, and look what is happening..
> [...]
> 
> -----Original Message-----
> From: Granoblastic Man [mailto:gr...@ta...]
> 
> When trying to compile my code, I get a long list of errors, but they can
> all be traced back to one single error:
> "36 C:\CYGWIN\HOME\Granoblastic Man\Triad\ITEM.h
> parse error before `char'"
> 
> 34 enum size
> 35 {
> 36  small,
> 37  medium,
> 38  large,
> 39  giant
> 40 };
> 
> [...]

-- 
>> gisan >>
Give him an evasive answer.

[Dev-C++] =?iso-8859-1?Q?Win32_programming_help?=

[=?iso-8859-1?Q?<vin...@la...>]

I want to write that a program that : =0D=0A1) will be able to get the li=
st of programs that are running =0D=0Aat the same time=0D=0A2) will be ab=
le to close(=3Dto exit, to shut down) some of these =0D=0Aapplications=0D=
=0A=0D=0AWhat functions do I need ?=0D=0A=0D=0AExcuse me for my bad engli=
sh=0A=0AAcc=E9dez au courrier =E9lectronique de La Poste : www.laposte.ne=
t ; =0A3615 LAPOSTENET (0,13 =80/mn) ; t=E9l : 08 92 68 13 50 (0,34=80/mn=
)"=0A=0A

RE: [Dev-C++] What the heck?!

[Jaap de W. <wo...@Ne...>]

Yes, the code you show here has correct syntax.
I expect that somewhere in your include files there is a 
#define small char.
Just replace small by GranoBlasticSmall, and look what is happening..
BTW all coding books suggest you better can use a more explicit name.
Because the kind of names is so general, that they fit for any
implementation,
there is a big change that the names will conflict with a future or existing
name. 

-----Original Message-----
From: Granoblastic Man [mailto:gr...@ta...]
Sent: Thursday, February 13, 2003 03:56 AM
To: dev...@li...
Subject: [Dev-C++] What the heck?!


When trying to compile my code, I get a long list of errors, but they can
all be traced back to one single error:
"36 C:\CYGWIN\HOME\Granoblastic Man\Triad\ITEM.h
parse error before `char'"

34 enum size
35 {
36  small,
37  medium,
38  large,
39  giant
40 };

... What in the heck is it talking about? From what I recall, enums can have
any name assigned to the variables, right? So what's wrong with _this_
enum?!

[Dev-C++] RE: C++ Beginner Books

[lamont <lam...@ve...>]

>Hi,
>Can anyone recommend any good C++ books for a beginner?
>Thanks in advance,
>V. Ewing

The book by Deitel & Deitel (father and son team) "C++ How to Program" is
pretty good.  Its used in college classrooms and assumes no prior knowledge
of programming. The content is pretty comprehensive.

Another one which is a little harder to read is the book by Stroustrup "C++
programming Language".  I think that c++ programmer should have this book on
his/her shelf.

You might also consider picking up "The C++ Standard Library" by Josuttis.
Its always good to have a reference like this.

[Dev-C++] What the heck?!

[Granoblastic M. <gr...@ta...>]

When trying to compile my code, I get a long list of errors, but they =
can all be traced back to one single error:
"36 C:\CYGWIN\HOME\Granoblastic Man\Triad\ITEM.h
parse error before `char'"

34 enum size
35 {
36  small,
37  medium,
38  large,
39  giant
40 };

... What in the heck is it talking about? From what I recall, enums can =
have any name assigned to the variables, right? So what's wrong with =
_this_ enum?!

Re: [Dev-C++] Sorting Queues

[<or...@vp...>]

Samuel Keding wrote:
> Thanks,
Well, if this is for me, I forgot to say, that compproc(void*,void*) has 
to work like the cmp() in qsort().
It has to return 0 if the two arguments are equivalent, return < 0 if 
the first is "smaller" and return > 0 when the first is "greater" than 
the second.
Also the list is sorted like the smaller ones are at the beginning, so 
the list is incremental. If you want it to be decremental, obviously you 
need to reverse the return value of cmp.
One last note: xlist_destroy() first removes all nodes, then destroys 
the list. Actually it is up to you to first free all values in the 
nodes, and to set the destroyed xlist to NULL, if you need.

Sorry, but the implementation lacks documentation, so if you don't 
understand something, just mail me (or take a look at the code, it is 
short :)

--
Greetings,
   Balázs

[Dev-C++] Dev C++ Error: "The input line is too long."

[<gra...@ya...>]

When I try and link my dll (with a lot of object files
in it), dllwrap is returning "The input line is too
long." I'm using version 4.9.6 of Dev-C++ with the
mingw you get with it.

Does anyone know what might cause this?

Cheers

Andy

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[Dev-C++] Newbie: How do I include a resourece file .rc

[Lars-Bo J. <la...@fo...>]

Hi al,

I need to include wx.rc resource file from the wxWindows packages in Dev-Cpp
4.9.75. In the help file - section "Project options overview" it is
specified that I should do this in "Project options| Files directories|
Resource file" But this tab does not exist. In my version of Dev-Cpp, there
are only tabs for directories not files. So where do I tell Dev-Cpp to
include my resouce file ?

Regards

Lars-Bo

Re: [Dev-C++] C++ Beginner Books

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

"Accelerated C++" by Andrew Koenig, Barbara Moo.=0D
 =0D
 =0D
=0D
Ioannis Vranos=0D
 =0D
* Programming pages: http://www.noicys.freeurl.com=0D
* Alternative URL: http://run.to/noicys  =0D
 =0D
 =0D
-------Original Message-------=0D
 =0D
From: vangie ewing=0D
Date: =D4=E5=F4=DC=F1=F4=E7, 12 =D6=E5=E2=F1=EF=F5=DC=F1=E9=EF=F2 2003 3:=
33:09 =F0=EC=0D
To: dev...@li...=0D
Subject: [Dev-C++] C++ Beginner Books=0D
 =0D
Hi,=0D
 =0D
Can anyone recommend any good C++ books for a beginner?=0D
 =0D
Thanks in advance,=0D
V. Ewing=0D
=20

[Dev-C++] C++ Beginner Books

[vangie e. <ve...@ct...>]

Hi,

Can anyone recommend any good C++ books for a beginner?

Thanks in advance,
V. Ewing

Re: [Dev-C++] Sorting Queues

[<or...@vp...>]

Hello!

Samuel Keding wrote:
> Linked 
> lists are better but if I want to stick an element right in the 
> middle, I still have to follow the links all the way down the list. 

Well, I am making a project in C, and I needed sorted linked lists for 
it. I have made a very small implementation of a doubly linked closed 
list, which can be sorted, by giving a comparison function at the 
creation of the list (something like qsort()). If it is NULL, the list 
will be unsorted. I have made a small, yet very efficient function which 
inserts at the right place using the comparison function, or appends if 
it is NULL.
The list stores void* pointers, so actually anything can be contained in it.
Lists can be created, destroyed. Elements (void* values) can be added, 
removed, they are stored in nodes internally. Searching is also 
implemented. The list structure has a pointer to the first and the last 
node, and each node has a pointer to the previous and next nodes. So 
removal and insertation is fast.
The list is called xlist, nodes xnode.

Ex.: getting next value: xnode_current->next->value.
Ex.: Iterating through the list if needed:

xnode *xn
xlist *xl;
/* Create, add values here ... */
/* Iterate now: */
for(xn = xl->first;xn != NULL;xn = xn->next){
   xn->value ...
}

The whole stuff is one .c (only 90 lines of code) and one .h(40 lines of 
code) file (xlist.c, xlist.h). I have attached them. I hope it will be 
useful :)
Here is the interface for it (the xlist.h file):


/* General purpose list implementation
  * Header file
  * Written by: Balázs Oroszi
  * 2002
  */

#ifndef _S_XLIST_H
#define _S_XLIST_H
#ifdef __cplusplus
extern "C" {
#endif

   typedef int (*compproc)(void*,void*);

   typedef struct _xnode{
     void* value;
     struct _xnode *prev;
     struct _xnode *next;
   }xnode;

   typedef struct _xlist{
     int length;
     xnode *first;
     xnode *last;
     compproc cmp; /* if NULL, the list is unsorted */
   }xlist;

   /* list management */
   xlist* xlist_create(compproc cmp);
   void xlist_destroy(xlist *pxl);
   xnode* xlist_add(xlist *pxl, void* value);
   int xlist_remove(xlist *pxl, xnode *pxn);
   int xlist_length(xlist *pxl); /* O(1) time */

   /* list utility functions */
   xnode* xlist_search(xlist *pxl, void* value);

#ifdef __cplusplus
}
#endif
#endif

[Dev-C++] newbie Dev-C++4 - wxWindows 2.2.9 - w2000 - linker error

[RICARDO H. F. <OP...@si...>]

As informa=E7=F5es contidas neste  "e-mail"  e nos arquivos  anexados,  s=
=E3o para o
uso  exclusivo  do  destinat=E1rio  aqui  indicado,  e  podem  conter   s=
egredos=20
comerciais,  de  propriedade intelectual  ou  outras informa=E7=F5es conf=
idenciais,
protegidas pelas leis aplic=E1veis.  Caso n=E3o seja o destinat=E1rio cor=
reto, esteja
notificado, pelo presente, que qualquer revis=E3o, leitura, c=F3pia e/ou =
divulga=E7=E3o
do conte=FAdo deste  "e-mail"  s=E3o estritamente proibidas e n=E3o autor=
izadas.  Por=20
favor,  apague o conte=FAdo  do "e-mail" e notifique  o  remetente  imedi=
atamente.
Obrigado por sua coopera=E7=E3o.



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In case you  are  not  the  right addressee,  you are hereby notified tha=
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notify the sender immediately.=20
Thank you for your cooperation.

[Dev-C++] Unable to debug using Version 4.9.7.0

[sachin p. <coo...@ya...>]

Hello group,
   I am a new user of Dev Cpp. I was amazed by the GUI
provided and feel that the interface is as good as
most commercial IDEs.
I have downloaded and installed the version 4.9.7.0 of
the IDE but I had problems in debugging the code. 
1. As soon as I start stepping through the code, new
source windows start popping up with each single step(
F7) command. 
2. Also I am unable to close these windows even after
stopping the debugging session and have to restart the
application.
This has made it almost impossible to debug any code.

I have looked through the FAQs and there is no mention
to any such problem. Also I have been subscribing to
this list and here also nobody has reported similar
problems. 
I want to know if there is some setting that I am
getting wrong. ( I tried with a fresh installation and
the problem is still there )

I have tried the version 4 of the IDE along with
Insight debugger. That setup seems to work fine.

PS: Please excuse me for putting the query on the
mailing list instead of using the vRoach error / bug
reporting tool. ( I don't think this is a bug )

Thanks in advance,
Sachin Patil.

__________________________________________________
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SV: [Dev-C++] Newbie on wxWindows create

[Lars-Bo J. <la...@fo...>]

I tried to include both=20
Dev-Cpp\include
Dev-Cpp\include\wx\msw

I did a rebuild, still same error. I can compile, and the main window =
of my
application works and the opening of common dialogs works as well, so =
is it
really a problem with the inclusion wx.rc file I mean is that file not =
need
by the other processes?

Lars-Bo

-----Oprindelig meddelelse-----
Fra: "J=F6rgen" [mailto:qa...@ho...]
Sendt: 11. februar 2003 15:00
Til: Lars-Bo Jacobsen; dev...@li...
Emne: Re: [Dev-C++] Newbie on wxWindows create


Set your Dev-Cpp\include directory as a resource directory =
(Project->Project
Options->Directories->Resource Directories)


*********** REPLY SEPARATOR  ***********

On 2003-02-11 at 14:24 Lars-Bo Jacobsen wrote:

>Hi all
>
>I am working my way throuh David Beech tutorial on wnWindows. I am to
>create
>a custom dialog, and the program compiles fine but when I do the event =
that
>is suposed to open the custom dialog I get the following error =
message.
>
>Assert failed in file ../../src/msw/dialog.cpp at line 174: Failed to
>create
>dialog. You probably forgot to include wx/msw/wx.rc in your resources.
>
>
>I thought that DEV-Cpp maintains whatever is nessesary regarding =
resources.
>If not where do i tell Dev-Cpp about this resource file?.=20
>
>any help is apriciated
>
>Regards
>
>Lars-Bo
>
>
>
>-------------------------------------------------------
>This SF.NET email is sponsored by:
>SourceForge Enterprise Edition + IBM + LinuxWorld =3D Something 2 See!
>http://www.vasoftware.com
>_______________________________________________
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>Dev...@li...
>TO UNSUBSCRIBE: http://www.noicys.cjb.net/devcpp/ub.htm
>https://lists.sourceforge.net/lists/listinfo/dev-cpp-users

s

Re: [Dev-C++] Newbie on wxWindows create

[<qa...@ho...>]

Set your Dev-Cpp\include directory as a resource directory=
 (Project->Project Options->Directories->Resource Directories)


*********** REPLY SEPARATOR  ***********

On 2003-02-11 at 14:24 Lars-Bo Jacobsen wrote:

>Hi all
>
>I am working my way throuh David Beech tutorial on wnWindows. I am to
>create
>a custom dialog, and the program compiles fine but when I do the event=
 that
>is suposed to open the custom dialog I get the following error message.
>
>Assert failed in file ../../src/msw/dialog.cpp at line 174: Failed to
>create
>dialog. You probably forgot to include wx/msw/wx.rc in your resources.
>
>
>I thought that DEV-Cpp maintains whatever is nessesary regarding=
 resources.
>If not where do i tell Dev-Cpp about this resource file?. 
>
>any help is apriciated
>
>Regards
>
>Lars-Bo
>
>
>
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s

[Dev-C++] Newbie on wxWindows create

[Lars-Bo J. <la...@fo...>]

Hi all

I am working my way throuh David Beech tutorial on wnWindows. I am to create
a custom dialog, and the program compiles fine but when I do the event that
is suposed to open the custom dialog I get the following error message.

Assert failed in file ../../src/msw/dialog.cpp at line 174: Failed to create
dialog. You probably forgot to include wx/msw/wx.rc in your resources.


I thought that DEV-Cpp maintains whatever is nessesary regarding resources.
If not where do i tell Dev-Cpp about this resource file?. 

any help is apriciated

Regards

Lars-Bo

Re: [Dev-C++] Sorting Queues

[Per W. <pw...@ia...>]

It's a bit hard to understand exactly what problem you want to solve.

You might build a sorted priority queue with a <map>, where each entry is
mapped from <prio,sequence> -> <entry>.

A <map> is normally constructed from a RedBlack tree, i.e. an efficient
form of balanced tree. Insert, Find, Remove etc will be performed in log
time.

/Per W

On Mon, 10 Feb 2003, Samuel Keding wrote:

> A bit of a strange question here. I want to make a queue that I
> can search through for a flag and if the flag is set to one condition
> perform operation A. If it is set to another condition do operation
> B, etc, etc. I thought an effiecent way to do this would be to sort
> the items before they go onto the queue, but to do this I would
> have to have a function that can stick a queue element in between
> other elements. With arrays this is terribly wastiful of time. Linked
> lists are better but if I want to stick an element right in the
> middle, I still have to follow the links all the way down the list.
> I thought of dynamically allocating an array of pointers that point
> to a datatype T (template) but I would still have to worry about
> a bunch of assignment operations. The last option I can think of
> is my original flag with an array, but I really wish I could come
> up with a better way to sort the queue. Your help is appreciated.
>
>
>
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