sorry to luigi for the PM.
> I have changed: class arrhenius { ... } arh;
> to class arrhenius { ... };
> insert in arrh.cpp: arrhenius arh;
> and in main.cpp inserted: extern arrhenius arh;
>
> now it works. There is a runtime error, but I will find and eliminate them
> by myself.
> Thanks to all.
> Horst
>
>
> > Hi, Horst
> >
> > Here is my opinion about your link error, as for the other two things, I
>
> > don't have a solution.
> >
> > Your code is placed in two files: one is "arrh.h" and the other is
> > "main.cpp".
> > the former, as stated by its extension, is an header file, as a rule of
> > thumb, these files should contain declarations only.
> >
> > For instance:
> > class arrhenius { ... };
> >
> > In your case, you have:
> > class arrhenius { ... } arh;
> >
> > You not only declared the class "arrhenius", but also defined the
> variable
> >
> > "arh".
> >
> > Since the language expects to find one definition for each variable, if
> > you
> > include the header in two different source files, the linker will find
> two
> >
> > definition for the same variable and will issue an error message.
> >
> > I suggest you change your code as follows:
> >
> > arrh.h
> > ------------
> > #ifndef arrh_H
> > #define arrh_H
> >
> > class arrhenius
> > {
> > ...
> > };
> >
> > #endif // not defined arrh_H
> >
> >
> >
> >
> > main.cpp
> > -------------
> > #include "arrh.h"
> >
> > int
> > main()
> > {
> > ...
> > arrhenius arh;
> > ...
> > }
> >
> >
> >
> > At 08:12 04/02/02 +0000, Horst Roessner wrote:
> > >Hello and moin moin,
> > >
> > >I have a seriously problem. The following code produced a linker error
> > and
> > >no code is build.
> >
>
>c:\dev\dev-c++\testproj\arrh.o(.bss+0x0)://c/dev/dev-c++/testproj/arrh.cpp:
> >
> > >multiple definition of `arh'
> >
>
>c:\dev\dev-c++\testproj\main.o(.bss+0x0)://c/dev/dev-c++/testproj/main.cpp:
> >
> > >first defined here
> > >If i commented out the include, all is compiled fine. I does not
> > >understand it. Can anyone help me ? Thanks in advance.
> > >File:arrh.h
> > >#ifndef arrh_H
> > >#define arrh_H
> > >[...]
> > >class arrhenius
> > >{
> > >public:
> > >arrhenius();
> > >[...]
> > >bool calc();
> > >} arh;
> > >
> > >File: main.cpp
> > >#include <cstdlib>
> > >#ifndef arrh_H
> > >#include "arrh.h"
> > >#endif
> > >int main(int argc, char *argv[])
> > >{
> > >[...]
> > >bool b = arh.calc();
> > >[...]}
> > >#endif
> > >There are two other questions.
> > >Last day I have integrated a win api referenz as winhelp into dev-c++.
> > >After copy it in the help directory, it was automaticly integrated.
> Great
> > !!
> > >Now I seek such for C/C++ commands, a language reference. Any tip ?
> > >Where can I find a list of changes between gcc 2.9.5.2 and gcc 2.9.5.3
> ?
> > >I could not find anything.
> > >greetings
> > >Horst
> > >
> > >_______________________________________________
> > >Dev-cpp-users mailing list
> > >Dev...@li...
> > >https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
> >
> > --
> > Luigi
> > gi...@li...
> >
> >
> > _______________________________________________
> > Dev-cpp-users mailing list
> > Dev...@li...
> > https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
> >
>
> --
> --------------------------
> Horst Rößner
> Postf. 1802
> 52205 Stolberg
>
> 02402 / 6178
> 0171 6455636
>
> GMX - Die Kommunikationsplattform im Internet.
> http://www.gmx.net
>
>
--
--------------------------
Horst Rößner
Postf. 1802
52205 Stolberg
02402 / 6178
0171 6455636
GMX - Die Kommunikationsplattform im Internet.
http://www.gmx.net
|
