dev-cpp-users Mailing List for Dev-C++

> -----Original Message-----
> From: jansb000 [mailto:jan...@wx...] 
> Sent: Thursday, November 01, 2001 12:45 AM
> To: Ioannis Vranos
> Subject: Re: [Dev-C++] About member functions
> 
> 
> I think what they mean by this is that if you use a pointer 
> to a member-function, the actuall function that you point to 
> is resolved at run-time, since, probably due to overloading 
> or inheritance, the exact target can not be resolved during 
> compile time.
> 
> The member functions are already available and they appear 
> only once in memory. However if you use overloeding, then 
> what appears to be the same function is actually several 
> times in memory. For example all your classes may contain an 
> overloaded operator=(); This may result in many different 
> versions of this function. But each variant of this function 
> is in the program only once.


Well a pointer pointing to a specific overloaded member function will
point at the certain function, ignoring the other ones. I hope we are
telling the same thing.


Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.f2s.com
* Alternative URL: http://run.to/noicys

You need a graphics library.  And the last time I checked this e-mail list
is not concerned with graphics.  This is the Dev-C++ list.
Maan
----- Original Message -----
From: Christiaan Scholtz
To: dev...@li...
Sent: Wednesday, October 31, 2001 2:09 PM
Subject: [Dev-C++] Drawing lines


How do you put a pixel on the screen?

This subject has been discussed on th e past, but now new evidence came
up. :)
=20
=20
In "The C++ Programming Language" Special Edition on page 419 it says
that each object has its own member function as i was claiming in the
beginning.
=20
=20
It says many things but lets concentrate at the end of that page:
=20
"Just like ordinary pointers to functions, pointers to member functions
are used when we need to refer to a function without having to know its
name. However, a pointer to member isn't a pointer to a piece of memory
the way a pointer to a variable or a pointer to a function is. It is
more like an offfset into a structure or an index into an array. When a
pointer to member is combined with a pointer to an object of the right
type, it yields something that identifies a particular member of a
particular object".
=20
=20
i think we were discussing it with Jason Hardman. Jason if you see it,
please tell me your opinion (since you seem you are a pro).
=20
=20
Ioannis
=20
* Ioannis Vranos
* Programming pages: http://www.noicys.f2s.com
<http://www.noicys.f2s.com/>=20
* Alternative URL: http://run.to/noicys
=20

How do you put a pixel on the screen?

You may be checking Do Not Make a Console Window.  If so, uncheck and =
see if it works.
Maan
  ----- Original Message -----=20
  From: St0fF 64=20
  To: Dev...@li...=20
  Sent: Wednesday, October 31, 2001 12:20 PM
  Subject: [Dev-C++] getting SDL 4 MingW32 to compile ...


  Hi!
  I=B4ve got a problem.  I downloaded SDL-devel 4 mingw32 and depacked =
the .h - files to \devcpp\include\SDL.  When I include "SDL\SDL.h" =
there's no problem. I also depacked the .a - files to \devcpp\lib.  When =
I compile with "-lsdl" the linker output is as follows:

  // linker output:
  D:\IDE\devCPP\Lib\\libmingw32.a(main.o)(.text+0x8e): undefined =
reference to `WinMain@16'

  I guess I need to link to another lib aswell.  Which one is it? Or if =
I'm wrong, what's wrong?

  Any help is apprecciated ...

  Cheers, St0fF.

Hi!
I=B4ve got a problem.  I downloaded SDL-devel 4 mingw32 and depacked the =
.h - files to \devcpp\include\SDL.  When I include "SDL\SDL.h" there's =
no problem. I also depacked the .a - files to \devcpp\lib.  When I =
compile with "-lsdl" the linker output is as follows:

// linker output:
D:\IDE\devCPP\Lib\\libmingw32.a(main.o)(.text+0x8e): undefined reference =
to `WinMain@16'

I guess I need to link to another lib aswell.  Which one is it? Or if =
I'm wrong, what's wrong?

Any help is apprecciated ...

Cheers, St0fF.

andreas otto escribió:

> Hi,
>
> does anyone know where to find the wxWindows packages for DevC++?
>
> I was having a look at
> [ http://members.fortunecity.com/honglilai/wxwindows.html ]
> but apart from the demos zip file I keep getting 404s when trying to
> download.
>
> Thanks for your help,
> Andreas
>
> --
> andreas otto - an...@ph...
> Using php on windows? http://www.php4win.de
>
> _______________________________________________
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>
> _______________________________________________
> Dev-cpp-users mailing list
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http://www.thefreecountry.com/developercity/guilibraries.shtml
Here I found a link for download the wxwindows GUI library.

You can either use the Windows GDI and get a device context etc..., which
isn't recomended if you want speed, or you can write your own algorithm to
do it. You might want to look up something like the Bresenhams algorithm
which does that.

If you want more information I can dig out a copy of Bresenhams I developed
in college?

Jason.


----- Original Message -----
From: "<Dx 8a>" <vin...@ed...>
To: "Dev-C++ mailing list" <dev...@li...>
Sent: Wednesday, October 31, 2001 5:02 AM
Subject: [Dev-C++] Drawing lines


> In DirectX's DirectDraw, how do I draw a straight line from Point A having
coordinates (x1,y1) to point B with coordinates (x2,y2). is there a specific
function for this operation?
>
> Thanks
>
> __________________________________
> www.edsamail.com
>
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users

In DirectX's DirectDraw, how do I draw a straight line from Point A having coordinates (x1,y1) to point B with coordinates (x2,y2). is there a specific function for this operation?

Thanks

__________________________________
www.edsamail.com

Relying on type conversions to crop a number to a specific number of decimal
places isn't the best way of going about it, although it is usualy quite
effective. There are some mathematical functions for dealing with rounding
and integer values, and the one I suggest you look at is abs(), or fabs().
abs() is an overloaded function available in C++ whereas fabs() is
specificaly for float values (it actualy uses a double). You may already
know this, but multiplying by a power of ten before apply abs and then
dividing by that value again will allow you to choose to how many decimal
places you want to work. Adding .5 after the multiplication will ensure
proper rounding also.

The problem you are having with the lack of accuracy in the float is most
likely due to the inherant flaw in floating point representation. They
cannot represent all values in thier range dead on, and there will always be
a certain amount of rounding errors in some calculations. There's not a lot
you can do about it. There are different ways of representing numbers, but I
doubt you need that level of accuracy. What you can do with cout, or when
converting a number to a string is to set the number of decimal places it
will display, so the extra 0001 will be chopped off. For cout or other
stream operations I suggest you look at the precision() method. If you are
using sprintf then something like - sprintf(strarray, "%1.2f", my_float);
which should (I think) produce a number of at least 1 significant digit with
rounding to 2 decimal places. Experiment with it a little to see what
produces the results you want.

Jason.

Disclaimer: This information is meant as a guide, and may not be interpreted
as gospel truth. I try to reasonably, but not overly, accurate.


----- Original Message -----
From: "Brian McCall" <str...@ho...>
To: <dev...@li...>
Sent: Wednesday, October 31, 2001 2:19 AM
Subject: [Dev-C++] Damn floats


> I'm having much trouble trying to manipulate floats.  I try to truncate
the
> part left of the decimal like so:
>
> float num1 = 45.34;
> int num2 = int (num1);
> num1 -= float (num2);
>
> But when I display num1 (cout<<num1), I get something like 0.3400001.
> What am I supposed to do about this?
>
> Actually, the reason I am doing this is as part of a function that assigns
a
> float to a string, i.e., storing num1 in something like strNum1 as "45.34"
> (apstring strNum1; strNum1 = num1).
>
> Any ideas on either of these two problems?
>
> _________________________________________________________________
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>
>
> _______________________________________________
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> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users

> -----Original Message-----
> From: dev...@li...=20
> [mailto:dev...@li...] On Behalf=20
> Of Brian McCall
> Sent: Wednesday, October 31, 2001 4:20 AM
> To: dev...@li...
> Subject: [Dev-C++] Damn floats
>=20
>=20
> I'm having much trouble trying to manipulate floats.  I try=20
> to truncate the=20
> part left of the decimal like so:
>=20
> float num1 =3D 45.34;
> int num2 =3D int (num1);

The first cast is not needed.

> num1 -=3D float (num2);

The second cast also is not needed. These are built in type conversions.


>=20
> But when I display num1 (cout<<num1), I get something like=20
> 0.3400001. What am I supposed to do about this?

num1 is a float. So you display it as a float. only if you cast it as an
int you will get an int.
But the style of casting you use is the worst. Type1(x) or (Type1)x
(C-style) are equivallent and the worst. Normally in your case you can
output the int part by using an int. however if you just play with these
things the most safe is:


#include <iostream>

int main()
{
 using std::cout;
 using std::endl;
=20
 float f=3D0.2;
=20
 cout<<static_cast<int>(f)<<endl;
}


However try to *never* use casting in C++ (in contrast with C).


> Actually, the reason I am doing this is as part of a function=20
> that assigns a=20
> float to a string, i.e., storing num1 in something like=20
> strNum1 as "45.34"=20
> (apstring strNum1; strNum1 =3D num1).
>=20
> Any ideas on either of these two problems?

If you wantt to create that function don't bother, you have got
sprintf().

char s[200];
sprintf(s, "%f", 4.4);
string sf=3Ds;



Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.f2s.com
* Alternative URL: http://run.to/noicys

I'm having much trouble trying to manipulate floats.  I try to truncate the 
part left of the decimal like so:

float num1 = 45.34;
int num2 = int (num1);
num1 -= float (num2);

But when I display num1 (cout<<num1), I get something like 0.3400001.
What am I supposed to do about this?

Actually, the reason I am doing this is as part of a function that assigns a 
float to a string, i.e., storing num1 in something like strNum1 as "45.34" 
(apstring strNum1; strNum1 = num1).

Any ideas on either of these two problems?

_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp

Hi list=2E I try to compile an *=2Ec file and I haven=B4t got errors but =
in =

the =22compiler and linker output=22 (DEV-C++ 4) appear a lot of messages=
 =

like this=3A
=22C=3A=5CTEMP=5Cccbhaaaa=2Eo(=2Etext+0x1b)=3Aclient=2Ec=3A undefined ref=
erence to =

=60v3SignalRegister=27=22 Anybody can help me=3F The varaible are declara=
ted and =

I don=B4t know why appear this message=2E Thanks for all!!!!


Fdo=3A Dave
     =



=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F
 Te gustan las carreras de coches=3F Tu pel=EDcula es The Fast and the =

furious (a todo gas)=2E =

 Airtel Vodafone te la trae y sortea un viaje a Los Angeles para dos =

personas y un curso de conducci=F3n deportiva=2E Te interesa=3F Ven a =

http=3A//www=2Eqtal=2Ecom

Hi all

I am pretty new to C++ and totally new to DEV++, but it seems like a great
development platform. But I have a problem if have some programs that I did
with the cygwin package using the GNU cgicc library. It was easy to compile
that library for use with cygwin, but how can I compile the library for use
with DEV++ ? can it be done at all ?. 

I tried to configure DEV++ to use my Cygwin package but the specification of
the various paths does not comply with the newest cygwin package
(c:\Dev-c++\Mingw and Cygwin.txt).

Any help will be appreciated.

Lars-Bo

 
________________________________________________
Lars-Bo Jacobsen, Researcher M.Sc. ( Economics) 
Danish Institute of Agricultural and Fisheries Economics
Phone:  +45 35 28 68 00 (direct: +45 35 28 68 57)
Fax:      +45 35 28 68 01

________________________________________________
Lars-Bo Jacobsen, Researcher M.Sc. ( Economics) 
Danish Institute of Agricultural and Fisheries Economics
Phone:  +45 35 28 68 00 (direct: +45 35 28 68 57)
Fax:      +45 35 28 68 01

How can I make a transparent window? Ive tried setting the =
WS_EX_TRANSPARENT style for a window but that just makes its initial =
state transparent (if you move it the background moves with it)

Nothing is included by default.
=20
=20
Ioannis
=20
* 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
Christiaan Scholtz
Sent: Sunday, October 28, 2001 12:06 AM
To: dev...@li...
Subject: [Dev-C++] untitled1.o no such file or directory


I figured out why free wasnt working. I hadnt included stdlib.h. Isnt it
supposed to be included by default though?

I figured out why free wasnt working. I hadnt included stdlib.h. Isnt it =
supposed to be included by default though?

Ok I now think that that other linker error was as a result of this
compiling error:

c:\my documents\untitled1.cpp: In function `int LoadGLTextures()':

c:\my documents\untitled1.cpp:78: implicit declaration of function `int
free(...)'

Whats wrong with using the free function?

I found it

I get this error when trying to compile some code.I read in some posts =
that glaux is not supported anymore but that when this guy downloaded a =
glaux.dll from the net and put it in his system folder that it worked =
fine. I am having a hard time finding this file... can anyone help?

Hello,

I just started using Dev-C++.  The included editor doesn't seem to have any
keyboard shortcuts for manipulating the text (like block moves).  I was
wondering if it does and I am just not seeing it?  Or, is there another
editor that is preferred?

Jack
-- 
E-Mail: jy...@tw...
Alt:        jyork@voyager,net
Home:  http://my.voyager.net/~jyork

Ehehe, never mind what you did was an accomplishment. :)
 
 
Ioannis
 
* Ioannis Vranos
* Programming pages: http://www.noicys.f2s.com
<http://www.noicys.f2s.com/> 
* Alternative URL: http://run.to/noicys

-----Original Message-----
From: dev...@li...
[mailto:dev...@li...] On Behalf Of
Christiaan Scholtz
Sent: Friday, October 26, 2001 6:50 PM
To: dev...@li...
Subject: [Dev-C++] opengl in dev-c++?


Urgh its already in the faq all along! stoopid me!! urgh....

Urgh its already in the faq all along! stoopid me!! urgh....

I figured it all out! Whooohoo! Im am so proud of myself :-) I think  =
this all should be added to the dev-c++ faq... how do i do that?

What I did was I added "-lopengl32 -lglu32" as compiler options to the =
project and then everything compiled just fine! I also replaced =
CDS_FULLSCREEN with 0