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

Re: [Dev-C++] scope resolution +1

[Jason S. <mys...@op...>]

It's an initalizer list.  A short summary of them can be found here,
http://pstonge.stmarys.medford.or.us/adv_cpp_1/lectures/advanced_functions2.
htm, and here, http://oakroadsystems.com/codeprac/inher.htm.  They're short,
but to the point.  Basically it's initalizing a data member to a value as
it's created, instead of normal constructors which do so afterwards.

Jason
----- Original Message -----
From: "Daniel Glenfield" <sp...@ho...>
To: <dev...@li...>
Sent: Friday, April 19, 2002 4:01 AM
Subject: [Dev-C++] scope resolution +1


> What does it mean when you have the scope resolution operator and the
single
> : in the same bit of code?
>
> e.g.
>
> CDialog1::CDialog1(CWnd* pParent /*=NULL*/)
> : CDialog(CDialog1::IDD, pParent)
>
> ?

[Dev-C++] scope resolution +1

[Daniel G. <sp...@ho...>]

What does it mean when you have the scope resolution operator and the single 
: in the same bit of code?

e.g.

CDialog1::CDialog1(CWnd* pParent /*=NULL*/)
	: CDialog(CDialog1::IDD, pParent)

?

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Re: [Dev-C++] Global variables (linking errors)

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

While I agree that you should avoid global variables, like Santiago says, they can be needed at
times. The error you are getting is because each time you include the header you are in fact
redeclaring it. Headers are *only* for definitions, and no instantiation should occur in them. What
you need to do is create the global variable in the cpp file instead and in the header for that file
put an extern statement, i.e.

In the cpp file:

// global variable
int my_global_int;

In the .h file:

// allow other cpp files access to global variable
extern int my_global_int;

Hope this helps, Jason.



----- Original Message -----
From: "Daniel Glenfield" <sp...@ho...>
To: <dev...@li...>
Sent: Thursday, April 18, 2002 5:13 PM
Subject: [Dev-C++] Global variables (linking errors)


Help me out here would you? I have three C++ source files, each with its own
header file. I want to have a global variable that all three source files
can use.
But when I put the variable into one of the header files I get Linker
Errors, telling me the variable has already been defined in the first of my
source code files.

I think it's to do with the header files, but I'm not sure.

Can anyone help?

Daniel

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[Dev-C++] Begginer's question, Function overloading

[Blagger <car...@sk...>]

Hi

As a beginner I came to the chapter "function overloading" of a C++ handbook
and had the following exercise.
The problem with this listing is that dev-C++ gives me the errors :
110 too many arguments to function double f-seize(double,double)
320 at this point in line.

I know this, that's why it's called function overloading, or am I completely
wrong ?
Thanks in advance for any help.

10 // computing clothes size
20 // excercise on functions with function overloading
30
40 #include <stdio.h>
50 #include <iostream.h>
60 #include <conio.h>
70 #include <math.h>
80
90 double hat_seize(double h_weight,double h_height);
100  // first function returns hat-seize
110 double f_seize(double j_weight,double j_years);
120 // second function returns Waist in inches
130 // when overloaded and returns also Jacket seize
140
150 int main(int argc, char *argv[])
160 {
170  cout.setf(ios::fixed);
180  cout.setf(ios::showpoint);
190  cout.precision(1);
200 char answer = 'y';
210  double height, weight, age, h_seize,j_seize,w_seize;
220
230    do
240   {
250    cout << "\nTyp hier uw lengte in (in cm) : "; cin >> height;
260    cout << "\nTyp hier uw gewicht in (in kg) : "; cin >> weight;
270    cout << "\nTyp hier uw leeftijd in (jaren) : "; cin >> age;
280    cout << "\nEffe wachtte" << endl;
290    h_seize = hat_seize(weight,height);
300    w_seize = f_seize(weight,age);
310    // now we overload the second function :
320    j_seize = f_seize(weight,height,age);
330    cout << "\n De grootte van uw hoed : "; cin >> h_seize;
340    cout << "\n De grootte van uw jas : "; cin >> j_seize;
350    cout << "\n De grootte van uw broek : "; cin >> w_seize; cout <<
endl;
360    cout << "\n\tNogmaals? (Y/N) : "; cin >> answer;
370
380   }
390   while ((answer == 'Y') || (answer == 'y'));
400
410  getch();
420
430   return 0;
440 }
450
460 // first function calculates hat-size
470 double hat_seize(double h_weight,double h_height)
480 {
490  return ((h_weight / h_height) * 2.9);
500 }
510
520 //Second function (normal)
530 double f_seize(double j_weight,double j_years)
540 {
550  return ((j_weight/5.7) + (floor((j_years - 28)/2)/10));
560 }
570 //Second function (overloaded)
580 double f_seize(double j_weight,double j_height, double j_years)
590 {
600  return (((j_weight * j_height)/288) + (floor((j_years - 30)/10)/8));
610 }

RE: [Dev-C++] Global variables (linking errors)

[Santiago P. C. <San...@yd...>]

Hi Daniel,

Avoid the use of global variables!!!

Define the variable in the "main file" and pass it through
pointers/references to functions located in other code files.

It will be better if you do the same in the "main file", let's say: define
the variable inside the main function and pass it to functions as a
pointer/reference, you'll never worry again about where the child function
code is: in the same file or in another file.

Again: avoid the use of global variables!!!

Hope this helps!
Regards, Santy

PS: If I remember well there is something you can do with 'extern' reserved
word, but this is something I do not use, maybe someone else can give you
more help... Sorry


-----Original Message-----
From: Daniel Glenfield [mailto:sp...@ho...] 
Sent: Thursday, April 18, 2002 6:13 PM
To: dev...@li...
Subject: [Dev-C++] Global variables (linking errors)


Help me out here would you? I have three C++ source files, each with its own

header file. I want to have a global variable that all three source files 
can use.
But when I put the variable into one of the header files I get Linker 
Errors, telling me the variable has already been defined in the first of my 
source code files.

I think it's to do with the header files, but I'm not sure.

Can anyone help?

Daniel

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[Dev-C++] Global variables (linking errors)

[Daniel G. <sp...@ho...>]

Help me out here would you? I have three C++ source files, each with its own 
header file. I want to have a global variable that all three source files 
can use.
But when I put the variable into one of the header files I get Linker 
Errors, telling me the variable has already been defined in the first of my 
source code files.

I think it's to do with the header files, but I'm not sure.

Can anyone help?

Daniel

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Re: [Dev-C++] enum

[Bob W. <bo...@ph...>]

MessageI've been think about this, and isn't the call to =
system("pause"); a windows specific call and as such would not be =
portable to UNIX or any other operating system?

Regards,

Bob

  A more ANSI C++ compliant code would be:

  #include <iostream>
  #include <cstdlib>


  int main ()
  {
   using std::cout;
   using std::endl;
   using std::system;
  =20
   enum {Dog,Cat,Horse,Pig};

   int i;
     =20
   for (i =3D Dog; i <=3D Pig; i++)
       cout << "i =3D " << i << endl;
  =20
  =20
   system("pause");
  =20
   return 0;
  }
  =20

  or check the comments i have placed in your code.


  Ioannis

Re: [Dev-C++] Ansi compatible?

[<lho...@ho...>]

I think that is ANSI compatible but the BCB does not support.
try this:

#include <iostream>
#include <cstdlib>

using namespace std;

int main(int argc,char **argv){
    const int i=10;
    //use a const here.
    int arr[i];
    system("pause");
    return 0;
}

I havn't BCB,but I test it with CL.exe.


>From: "Anon" <an...@pu...>
>To: <dev...@li...>
>Subject: [Dev-C++] Ansi compatible?
>Date: Thu, 18 Apr 2002 11:50:11 +0530
>
>Hey!
>Can anyone please tell me if the following code is ANSI compatible? It 
compiles fine with DevC++ but throws up an error in Borland 5.0
>
>#include <iostream.h>
>#include <stdlib.h>
>
>int main()
>{
>       int i=10;
>       int arr[i]; //can it do accept Integer variable
>       system("PAUSE");
>       return 0;
>}
>
>My classmates say that this is a violation of ANSI standard.
>
>
>---
>Outgoing mail is certified Virus Free.
>Checked by AVG anti-virus system (http://www.grisoft.com).
>Version: 6.0.346 / Virus Database: 194 - Release Date: 4/10/2002


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Re: [Dev-C++] Ansi compatible?

[<lho...@ho...>]

I think that is ANSI compatible but the BCB does not support.
try this:

#include <iostream>
#include <cstdlib>

using namespace std;

int main(int argc,char **argv){
    const int i=10;
    //use a const here.
    int arr[i];
    system("pause");
    return 0;
}

I havn't BCB,but I hava tested it with CL.exe.


>From: "Anon" <an...@pu...>
>To: <dev...@li...>
>Subject: [Dev-C++] Ansi compatible?
>Date: Thu, 18 Apr 2002 11:50:11 +0530
>
>Hey!
>Can anyone please tell me if the following code is ANSI compatible? It 
compiles fine with DevC++ but throws up an error in Borland 5.0
>
>#include <iostream.h>
>#include <stdlib.h>
>
>int main()
>{
>       int i=10;
>       int arr[i]; //can it do accept Integer variable
>       system("PAUSE");
>       return 0;
>}
>
>My classmates say that this is a violation of ANSI standard.
>
>
>---
>Outgoing mail is certified Virus Free.
>Checked by AVG anti-virus system (http://www.grisoft.com).
>Version: 6.0.346 / Virus Database: 194 - Release Date: 4/10/2002


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RE: [Dev-C++] Ansi compatible?

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

-----Original Message-----
From: Ioannis Vranos [mailto:no...@ho...] 
Sent: Thursday, April 18, 2002 1:49 PM
To: Dev-C++
Subject: RE: [Dev-C++] Ansi compatible?





#include <stdlib.h> 
 
[...]
 
  std::system("PAUSE");
 
std:: was not needed since you use the xxx.h notion for the C subset
header files. It would be needed if it was 
#include <cstdlib> 
 
 

Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.cjb.net
<http://www.noicys.cjb.net/> 
* Alternative URL: http://run.to/noicys

Re: [Dev-C++] Ansi compatible?

[<jar...@ig...>]

>>From: "Anon" <an...@pu...>
>>To: <dev...@li...>
>>Subject: [Dev-C++] Ansi compatible?
>>Date: Thu, 18 Apr 2002 11:50:11 +0530
>>
>>Hey!
>>Can anyone please tell me if the following code is ANSI compatible? It 
>>compiles fine with DevC++ but throws up an error in Borland 5.0
>>
>>#include <iostream.h>
this should be   #include <iostream>    but you don;t need it in this
program
>>#include <stdlib.h>
this should be
#include <cstdlib>
using std::system;  // since you need the system function from cstdlib
>>
>>int main()
>>{
>>       int i=10;
>>       int arr[i]; //can it do accept Integer variable
NO, according to the standard this is only possible if you
replace the line above by
         const int i=10;

>>       system("PAUSE");
>>       return 0;
>>}
>>
>>My classmates say that this is a violation of ANSI standard.

They're right.


-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
Institute of Technology, RWTH Aachen
D 52056 Aachen, Germany

RE: [Dev-C++] Ansi compatible?

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

-----Original Message-----
From: dev...@li...
[mailto:dev...@li...] On Behalf Of Anon
Sent: Thursday, April 18, 2002 9:20 AM
To: dev...@li...
Subject: [Dev-C++] Ansi compatible?



Hey!
Can anyone please tell me if the following code is ANSI compatible? It
compiles fine with DevC++ but throws up an error in Borland 5.0
 
#include <iostream.h> 

#include <iostream>

 
 
#include <stdlib.h>
 
int main()
{
      int i=10; 

const int i=10;

 
      int arr[i]; //can it do accept Integer variable
       std::system("PAUSE");
      return 0;
}
 
My classmates say that this is a violation of ANSI standard. 
 
 
It is. 
 


Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.cjb.net
<http://www.noicys.cjb.net/> 
* Alternative URL: http://run.to/noicys

[Dev-C++] how to add a package to dev-c++

[chiesa <chi...@si...>]

hi,
i want to add wxWindows package to dev-c++.
but i don't know how to add a package to dev-c++ so
that i can open a self-defined project.
i know little details of package and template using in dev-c++.
i search the web using google,
but find none.
can anyone give me some help.
thanks.
                       chiesa
                       chi...@si...

Re: [Dev-C++] Ansi compatible?

[Daniel G. <sp...@ho...>]

Ummm not sure, I don't think you need iostream. But if so, try

#include <iostream>

then inside main()
using namespace std;



>From: "Anon" <an...@pu...>
>To: <dev...@li...>
>Subject: [Dev-C++] Ansi compatible?
>Date: Thu, 18 Apr 2002 11:50:11 +0530
>
>Hey!
>Can anyone please tell me if the following code is ANSI compatible? It 
>compiles fine with DevC++ but throws up an error in Borland 5.0
>
>#include <iostream.h>
>#include <stdlib.h>
>
>int main()
>{
>       int i=10;
>       int arr[i]; //can it do accept Integer variable
>       system("PAUSE");
>       return 0;
>}
>
>My classmates say that this is a violation of ANSI standard.
>
>
>---
>Outgoing mail is certified Virus Free.
>Checked by AVG anti-virus system (http://www.grisoft.com).
>Version: 6.0.346 / Virus Database: 194 - Release Date: 4/10/2002


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[Dev-C++] Ansi compatible?

[Anon <an...@pu...>]

Hey!
Can anyone please tell me if the following code is ANSI compatible? It =
compiles fine with DevC++ but throws up an error in Borland 5.0

#include <iostream.h>
#include <stdlib.h>

int main()
{
      int i=3D10;
      int arr[i]; //can it do accept Integer variable
      system("PAUSE");
      return 0;
}

My classmates say that this is a violation of ANSI standard.


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.346 / Virus Database: 194 - Release Date: 4/10/2002

Re: [Dev-C++] enum

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

I agree, but in addition to that it can be useful for flags i.e.

enum state {calm =3D 0, upset =3D 1, crying =3D 2, nervous =3D 4, =
psychotic =3D 8};

So you could say I am feeling:

state myself =3D psychotic | crying;

Which should evaluate to (int) 10.

Jason.

PS: probably not the best example in the world, but humour me.
  ----- Original Message -----=20
  From: Bob Wilson=20
  To: Dev-C++ User Mailing List=20
  Sent: Wednesday, April 17, 2002 7:29 PM
  Subject: Fw: [Dev-C++] enum





    The default is 0, and then each consequtive one is +1 the previous =
one. You can change the value of an enum by initialising it to something =
else, i.e.

    enum farmyard {cow, sheep, pig, chicken, fruitbat =3D 1000, =
elephant, pigmi}

    so cow =3D 0, sheep =3D 2, etc.. and then fruitbat =3D 1000, =
elephant =3D 1001, and so on.
  Absolutely correct, but when you assign a value to an enumerated =
element, it practically destroys or greatly limits the ability to use =
the enumerated elements in a for loop or switch statement.=20

  Regards,

  Bob Wilson

Fw: [Dev-C++] enum

[Bob W. <bo...@ph...>]

  The default is 0, and then each consequtive one is +1 the previous =
one. You can change the value of an enum by initialising it to something =
else, i.e.

  enum farmyard {cow, sheep, pig, chicken, fruitbat =3D 1000, elephant, =
pigmi}

  so cow =3D 0, sheep =3D 2, etc.. and then fruitbat =3D 1000, elephant =
=3D 1001, and so on.
Absolutely correct, but when you assign a value to an enumerated =
element, it practically destroys or greatly limits the ability to use =
the enumerated elements in a for loop or switch statement.=20

Regards,

Bob Wilson

RE: [Dev-C++] enum

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

A more ANSI C++ compliant code would be:
 
#include <iostream>
#include <cstdlib>
 

int main ()
{
 using std::cout;
 using std::endl;
 using std::system;
 
 enum {Dog,Cat,Horse,Pig};
 
 int i;
    
 for (i = Dog; i <= Pig; i++)
     cout << "i = " << i << endl;
 
 
 system("pause");
 
 return 0;
}
 
 
or check the comments i have placed in your code.
 
 
Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.cjb.net
<http://www.noicys.cjb.net/> 
* Alternative URL: http://run.to/noicys

-----Original Message-----
From: dev...@li...
[mailto:dev...@li...] On Behalf Of Bob
Wilson
Sent: Wednesday, April 17, 2002 3:03 PM
To: Dev-C++ User Mailing List
Subject: Re: [Dev-C++] enum


Daniel;
 

when you enumerate variables, is the first one (by default) 0 or 1 ?

Run this little program and you will get your answer.
 
#include <iostream.h> 
 

#include <iostream>

 
 
#include <conio_mingw.h> 
 

Not portable.

 
 
#include <stdio.h> 
 

Not needed.

 
 
// #include <windows.h> 
 

Header file for system extensions. Non needed.

 
 
// #include <stdlib.h> 
 
 
// #include <time.h> 
 

Not needed.

 
 
enum {Dog,Cat,Horse,Pig};
 
int main (int argc, char *argv[])
{
    int i;
    for (i = Dog; i <= Pig; i++)
         std::cout << "i = " << i << std::endl;
 
    std::cout << "\n\nHit any key to close window . . .";
 
     while (!kbhit()); 

 Not needed system extension.

 
    return 0;
}
 
 
 

RE: [Dev-C++] enum

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

0


Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.cjb.net
* Alternative URL: http://run.to/noicys


> -----Original Message-----
> From: dev...@li... 
> [mailto:dev...@li...] On Behalf 
> Of Daniel Glenfield
> Sent: Wednesday, April 17, 2002 1:04 PM
> To: dev...@li...
> Subject: [Dev-C++] enum
> 
> 
> when you enumerate variables, is the first one (by default) 0 or 1 ?
> 
> _________________________________________________________________
> Chat with friends online, try MSN Messenger: http://messenger.msn.com
> 
> 
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
> 

Re: [Dev-C++] enum

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

The default is 0, and then each consequtive one is +1 the previous one. =
You can change the value of an enum by initialising it to something =
else, i.e.

enum farmyard {cow, sheep, pig, chicken, fruitbat =3D 1000, elephant, =
pigmi}

so cow =3D 0, sheep =3D 2, etc.. and then fruitbat =3D 1000, elephant =
=3D 1001, and so on.

Jason.
  ----- Original Message -----=20
  From: Bob Wilson=20
  To: Dev-C++ User Mailing List=20
  Sent: Wednesday, April 17, 2002 1:02 PM
  Subject: Re: [Dev-C++] enum


  Daniel;

    when you enumerate variables, is the first one (by default) 0 or 1 ?
  Run this little program and you will get your answer.

  #include <iostream.h>
  #include <conio_mingw.h>
  #include <stdio.h>
  // #include <windows.h>
  // #include <stdlib.h>
  // #include <time.h>

  enum {Dog,Cat,Horse,Pig};

  int main (int argc, char *argv[])
  {
      int i;
      for (i =3D Dog; i <=3D Pig; i++)
           std::cout << "i =3D " << i << std::endl;

      std::cout << "\n\nHit any key to close window . . .";
      while (!kbhit());
      return 0;
  }

Re: [Dev-C++] enum

[Bob W. <bo...@ph...>]

Daniel;

  when you enumerate variables, is the first one (by default) 0 or 1 ?
Run this little program and you will get your answer.

#include <iostream.h>
#include <conio_mingw.h>
#include <stdio.h>
// #include <windows.h>
// #include <stdlib.h>
// #include <time.h>

enum {Dog,Cat,Horse,Pig};

int main (int argc, char *argv[])
{
    int i;
    for (i =3D Dog; i <=3D Pig; i++)
         std::cout << "i =3D " << i << std::endl;

    std::cout << "\n\nHit any key to close window . . .";
    while (!kbhit());
    return 0;
}

[Dev-C++] DEV compiler

[aussie <aus...@bi...>]

Tried to use the new DEVA to compile received a message.
Access violation at address 004FB939 in model 'DEVCPP.EXE'.=20
Read of address FFFFFFFF

[Dev-C++] enum

[Daniel G. <sp...@ho...>]

when you enumerate variables, is the first one (by default) 0 or 1 ?

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RE: [Dev-C++] Compile-C++4

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

This is probably a linking error, so better post the code that produces
the problem.
 
 
Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.cjb.net
<http://www.noicys.cjb.net/> 
* Alternative URL: http://run.to/noicys

-----Original Message-----
From: dev...@li...
[mailto:dev...@li...] On Behalf Of
Jcm...@ao...
Sent: Wednesday, April 17, 2002 6:14 AM
To: dev...@li...
Subject: [Dev-C++] Compile-C++4


Hi, when I try to compile, I get the window: 
Compiler and linker output. 
What can I do? 

[Dev-C++] Compile-C++4

[<Jcm...@ao...>]

Hi, when I try to compile, I get the window:
Compiler and linker output.
What can I do?