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

RE: [Dev-C++] please help

[Danny S. <Dan...@tr...>]

Replace

=20

#include <stdin.h>

=20

with

=20

#include <stdio.h>

=20

and try again.

=20

To everybody else: Does a stdin.h system header really exist or is this
just a typo? I've never seen this include file referenced before.

=20

Danny

=20

=20

________________________________

From: dev...@li...
[mailto:dev...@li...] On Behalf Of hao li
Sent: 21 September 2004 11:41
To: dev...@li...
Subject: [Dev-C++] please help

=20

I have just downloaded=20

=20

Dev-C++ 4.9.9.0 and try it for funtionality.=20

When compiling the basic C source codes it make me trouble

I used create new scource file and

I tried this programs here copied from the helpfile

=20

#include <stdin.h>
main()
{
    printf("Hello World\n");
}

=20

and

=20

=20

main() /* main function heading */
{
    printf("\n Hello, World! \n");  /* Display message on */
}                                   /* the screen *

=20

=20

when compiling it i got the error message

=20

in fuction `int main'

printf undecleared

=20

does anyone know whats wrong???

________________________________

Do you Yahoo!?
Yahoo! Mail is new and improved - Check it out!
<http://us.rd.yahoo.com/mail_us/taglines/new/*http:/promotions.yahoo.com
/new_mail>=20

Re: [Dev-C++] please help

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

First of all, I don't understand why you show two main() functions.

Second, to define printf() you should #include <stdio.h> and _not_
<stdin.h>

/Per W

On Tue, 21 Sep 2004, hao li wrote:

> I have just downloaded
>
> Dev-C++ 4.9.9.0 and try it for funtionality.
> When compiling the basic C source codes it make me trouble
> I used create new scource file and
> I tried this programs here copied from the helpfile
>
> #include <stdin.h>
> main()
> {
>     printf("Hello World\n");
> }
>
> and
>
>
> main() /* main function heading */
> {
>     printf("\n Hello, World! \n");  /* Display message on */
> }                                   /* the screen *
>
>
> when compiling it i got the error message
>
> in fuction `int main'
> printf undecleared
>
> does anyone know whats wrong???
>
>
>
> ---------------------------------
> Do you Yahoo!?
> Yahoo! Mail is new and improved - Check it out!

[Dev-C++] please help

[hao li <ha...@ya...>]

I have just downloaded 
 
Dev-C++ 4.9.9.0 and try it for funtionality. 
When compiling the basic C source codes it make me trouble
I used create new scource file and
I tried this programs here copied from the helpfile
 
#include <stdin.h>
main()
{
    printf("Hello World\n");
}
 
and
 
 
main() /* main function heading */
{
    printf("\n Hello, World! \n");  /* Display message on */
}                                   /* the screen *
 
 
when compiling it i got the error message
 
in fuction `int main'
printf undecleared
 
does anyone know whats wrong???


		
---------------------------------
Do you Yahoo!?
Yahoo! Mail is new and improved - Check it out!

Re: AW: [Dev-C++] Class definition across multiple files and general wrapper class design

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

When building libraries, the linker can not select individual
functions/variables that are referenced by the application. It always
includes complete object files from the library.

Because of this, a good library is modular, with a lot of small object
files to not require linking of more functions than what the application
need.

The same concept is true for classes. If creating really large classes, it
might be an id=E9a to split the class implementation into multiple object
files to allow an application to only link relevant portions.

However, often it is possible to instead split the class into a hierarchy
or by sending functor objects or similar as arguments to the methods.

/Per W

On Tue, 21 Sep 2004, Wehrli, Lior wrote:

>
> Hi Scott,
>
> > In learning OpenGL, I have decided to write my own small wrapper class
> > that provides me basic funcitons like setting up a window and so forth
> > to speed up the learning process. I have begun to write the wrapper
> > class, but have several questions:
>
> Have a look at GLUT, that library offers functions for all the standart w=
indow handling and interfacng stuff you normaly need.
>
> > 1. Can I span the class definition across multiple files, or must I
> > stich to the decleration in one .h file and the definition  in a .cpp f=
ile?
>
> You can use as many .cpp files as you want, but you can not span the decl=
aration of a class over several files. Consider that a class should form an=
 abstract entity that makes sense, i.e. all its member methods and properti=
es should somehow belong together.
>
> > 2. I have heard some people say you should only define one function per
> > .cpp file in a library due to size issues. Is this true, and if so, is
> > it worth the added effort?
>
> I have never heard that. It doesn't matter for the compiler where a funct=
ion implemented or how many functions are implemented in a single file. You=
 can put in a .cpp file what ever you want. The question is more: what make=
s sense? Usually the one .h and one .cpp per class is the best choice.
>
> > 3. What is the level of documentation required for a basic wrapper
> > class? I stick to a header at the top of each file, function headers,
> > and in code comments. Will it be necessary to include any external
> > documentation at this point?
>
> That is greate. I wish I could force myself to this level of documentary =
discipline. If the code is for your own use only, this should be more than =
enough.
>
> > 4. Should I just use several functions in a namespace instead of a clas=
s
> > to simplify the development process?
>
> Class vs namespace is not a question of simplification but of design logi=
c. If you hav several funtions which are often used together and/or in conj=
unction you should use a namespace. If you have several functions which wor=
k with the same data structures you might want to wrap the functions and th=
e data into a single class.
> BTW: A namespace CAN (and should) be spanned over several files.
>
> > 5. Are there any long term pros/cons associated with maintanence of a
> > class versus functions in a namespace?
>
> Can't think of one right now. I would use both anyway.
>
> Bye,
> Lior
>
>
>
> -------------------------------------------------------
> This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170
> Project Admins to receive an Apple iPod Mini FREE for your judgement on
> who ports your project to Linux PPC the best. Sponsored by IBM.
> Deadline: Sept. 24. Go here: http://sf.net/ppc_contest.php
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>

[Dev-C++] Intercepting Keyboard Events with Win32 Hooks

[Youssouf N. <yn...@gm...>]

I'm begining with hooks, and I think the way they work is a mystery.
If someone had an example, I'll gladly accept it or any help.

I've created a DLL containing the following hook callback function :

__declspec( dllexport )
LRESULT CALLBACK myHookProc (int nCode, WPARAM wParam, LPARAM lParam);

In this function, I'm logging events into a file, but no events are received.

I've tried both adding a WH_KEYBOARD hook and a WH_KEYBOARD_LL hook
but no one receives Keyboard Input.

In the Win32 API, the last argument of SetWindowsHookEx must be zero
in order to attach this hook to every running thread, and here is the
way I call it :

hook = SetWindowsHookEx(WH_KEYBOARD_LL, (HOOKPROC)hookproc, dllinst, 0);

Thanks

AW: [Dev-C++] Class definition across multiple files and general wrapper class design

[Wehrli, L. <we...@st...>]

=20
Hi Scott,

> In learning OpenGL, I have decided to write my own small wrapper class
> that provides me basic funcitons like setting up a window and so forth
> to speed up the learning process. I have begun to write the wrapper
> class, but have several questions:

Have a look at GLUT, that library offers functions for all the standart =
window handling and interfacng stuff you normaly need.

> 1. Can I span the class definition across multiple files, or must I
> stich to the decleration in one .h file and the definition  in a .cpp =
file?

You can use as many .cpp files as you want, but you can not span the =
declaration of a class over several files. Consider that a class should =
form an abstract entity that makes sense, i.e. all its member methods =
and properties should somehow belong together.

> 2. I have heard some people say you should only define one function =
per
> .cpp file in a library due to size issues. Is this true, and if so, is
> it worth the added effort?

I have never heard that. It doesn't matter for the compiler where a =
function implemented or how many functions are implemented in a single =
file. You can put in a .cpp file what ever you want. The question is =
more: what makes sense? Usually the one .h and one .cpp per class is the =
best choice.

> 3. What is the level of documentation required for a basic wrapper
> class? I stick to a header at the top of each file, function headers,
> and in code comments. Will it be necessary to include any external
> documentation at this point?

That is greate. I wish I could force myself to this level of documentary =
discipline. If the code is for your own use only, this should be more =
than enough.

> 4. Should I just use several functions in a namespace instead of a =
class
> to simplify the development process?

Class vs namespace is not a question of simplification but of design =
logic. If you hav several funtions which are often used together and/or =
in conjunction you should use a namespace. If you have several functions =
which work with the same data structures you might want to wrap the =
functions and the data into a single class.
BTW: A namespace CAN (and should) be spanned over several files.

> 5. Are there any long term pros/cons associated with maintanence of a
> class versus functions in a namespace?

Can't think of one right now. I would use both anyway.

Bye,
Lior

[Dev-C++] Class definition across multiple files and general wrapper class design

[Scott S. <age...@co...>]

In learning OpenGL, I have decided to write my own small wrapper class 
that provides me basic funcitons like setting up a window and so forth 
to speed up the learning process. I have begun to write the wrapper 
class, but have several questions:

1. Can I span the class definition across multiple files, or must I 
stich to the decleration in one .h file and the definition  in a .cpp file?
2. I have heard some people say you should only define one function per 
.cpp file in a library due to size issues. Is this true, and if so, is 
it worth the added effort?
3. What is the level of documentation required for a basic wrapper 
class? I stick to a header at the top of each file, function headers, 
and in code comments. Will it be necessary to include any external 
documentation at this point?
4. Should I just use several functions in a namespace instead of a class 
to simplify the development process?
5. Are there any long term pros/cons associated with maintanence of a 
class versus functions in a namespace?

Thank you in advanced for any advice you may have and answers to my 
questions. I have never done anything like this before, and want to make 
sure I do it correctly.

-- 
--Scott Simontis--

Re: [Dev-C++] Catching illegal pointer access

[Daniel K. O. <dan...@ya...>]

I just forgot to mention, depending on what you want to do, you can use 
signals. Obviously signals are used in a very different way than 
exceptions, but may be useful if all you want is to dump some 
information before the crash. See the example:

----
#include <iostream>
#include <csignal>
#include <cstdlib>

using namespace std;

void foo(int signum)
{
        cout << "Program crashed... press enter to finish" << endl;
        cin.ignore();
        exit(EXIT_FAILURE);
}

int main()
{
        signal(SIGSEGV, foo);

        int *a = 0;
        *a = 1;

        return EXIT_SUCCESS;
}
----

But quoting ISO/IEC 9899:1999, page 245:
"An implementation need not generate any of these signals, except as a 
result of explicit calls to the raise function. (...) The complete set 
of signals, their semantics, and their default handling
is implementation-defined (...)."



Daniel K. O.

Re: [Dev-C++] Catching illegal pointer access

[Daniel K. O. <dan...@ya...>]

Daniel Monteiro Ferreira wrote:

> I'm a DevC++ newbie and I'm still trying to get used to it. I wrote a 
> test program to see what happens if I try to access the contents of a 
> null pointer. I wrote the illegal access inside a try/catch block, but 
> instead of executing the catch block, the program simply shows an 
> error message and aborts. I set the code generation settings to enable 
> exception handling, but it didn't work. Can't this kind of error be 
> treated as an exception? If not, how can I keep my program from 
> aborting? I would apreciate if anybody helped me. Thanks!


Exceptions are used to handle run-time "errors". Accessing an invalid 
address is solely a programming error. What could you possibly do if at 
one point in your program you access an invalid address? It means that 
your algorithm is wrong, and you lost the data you were trying to access.


Daniel K. O.

[Dev-C++] Catching illegal pointer access

[Daniel M. F. <dan...@ya...>]

Hi!

I'm a DevC++ newbie and I'm still trying to get used to it. I wrote a =
test program to see what happens if I try to access the contents of a =
null pointer. I wrote the illegal access inside a try/catch block, but =
instead of executing the catch block, the program simply shows an error =
message and aborts. I set the code generation settings to enable =
exception handling, but it didn't work. Can't this kind of error be =
treated as an exception? If not, how can I keep my program from =
aborting? I would apreciate if anybody helped me. Thanks!

Daniel Ferreira.


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.764 / Virus Database: 511 - Release Date: 18/09/2004

Re: [Dev-C++] How to work with *.txt files??

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

Well, don't blame yourself. The human life is meant for learning :)

Logically, there isn't a difference between a vector and an array. Vector
is the mathematical term for a one-dimensional array, i.e. an array with a
single index.

The important thing about the stl template class vector is that it doesn't
grow by one every time you add one element, which would have resulted in
O(n^2) complexity.

A typical implementation doubles the length of the vector, whenever it
needs to grow. This makes sure that the reallocation times - on average -
may be ignored, and the inserts will then run in constant amortized time,
i.e. the _average_ insert will consume constant time.

If the vector is 1,000,000 elements long - and full - and you try to
add one more entry, it grows to a length of 2,000,000 resulting in the
next one million inserts not needing any reallocation.

It really doesn't matter if a string assign if efficient or not. The
important thing to avoid - when possible - is algorithsms with exponential
growth, since the total run time will start to escalate even for extremely
fast operations.

/Per W

On Sat, 18 Sep 2004, ZwiQ wrote:

> Per Westermark wrote:
>
> > <>Ouch.
> >
> > Don't do that.
> >
> > There is the vector template class in the stl.
>
> (Hielke blames himself for not reading a good C++ book himself :o)
>
> Hm, you're right. Thanks! I said I would use a vector but in the code I
> did use an simple array. Now I think of it, the code I wrote down there
> without good thinking was ment to store an array of pointers to strings,
> not strings themselves. Used it mainly when I had to reorganize the
> order of the stored strings with manipulation members (eg. sort).
> I assume that assigning pointers isn't as resourcesconsuming as
> assigning strings? However, you're still right about the complexity.
> Vector operations themselves all are lineair? So I should use a vector
> in that case too as well?
>
> Regards,
>     Hielke
>     Zw...@he...

Re: [Dev-C++] How to work with *.txt files??

[Daniel K. O. <dan...@ya...>]

Todd Gardner wrote:

>main.cpp:15: `list' undeclared (first use this function) main.cpp:15: (Each
>  
>

Sorry, I confused the headers; replace

#include <vector>

by

#include <list>


Daniel K. O.

RE: [Dev-C++] How to work with *.txt files??

[Todd G. <pi...@ea...>]

Hello,

When I run the program that shown below I receive the following compiler
output.  I running dev-C++ version 4.9.8.0 on Windows 2000.

Thanks for any ideas,

Todd

Compiler: Default compiler
Building Makefile: "E:\dev\cpp\devcpp\test\Makefile.win"
Executing  make...
make.exe -f "E:\dev\cpp\devcpp\test\Makefile.win" all
g++.exe -c main.cpp -o
ain.o -I"C:/Dev-Cpp/include/c++"  -I"C:/Dev-Cpp/include/c++/mingw32"  -I"C:/
Dev-Cpp/include/c++/backward"  -I"C:/Dev-Cpp/include"   main.cpp: In
function `void strings_test()':
main.cpp:15: `list' undeclared (first use this function) main.cpp:15: (Each
undeclared identifier is reported only once for each
   function it appears in.) main.cpp:15: parse error before `>' token
main.cpp:17: `foo' undeclared (first use this function) main.cpp: In
function `void int_test()':
main.cpp:26: parse error before `>' token make.exe: *** [main.o] Error 1
Execution terminated

> -----Original Message-----
> From: dev...@li...
> [mailto:dev...@li...]On Behalf Of Daniel K.
> O.
> Sent: Saturday, September 18, 2004 2:51 PM
> To: zw...@he...
> Cc: dev...@li...
> Subject: Re: [Dev-C++] How to work with *.txt files??
>
>
> ZwiQ wrote:
>
> > I assume that assigning pointers isn't as resourcesconsuming as
> > assigning strings?
>
>
> Most STL implementations (including GCC) provide an efficient way to
> copy a string. In Stroustrup's book he illustrates a basic string
> implementation this way.
> Try it youself:
>
> ----
> #include <string>
> #include <vector>
> #include <iostream>
>
> using namespace std;
>
> const int n = 10000000; // just any big number
>
> void strings_test()
> {
>     cout << "Strings test, press enter to start" << endl;
>     cin.ignore();
>     string msg =
> "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklm
> nopqrstuvwxyz";
>     list<string> foo;
>     for (int i=0; i<n; i++)
>        foo.push_back(msg);
>     cout << "Press enter to free " << n << " strings" << endl;
>     cin.ignore();
> }
>
> void int_test()
> {
>     cout << "Int test, press enter to start" << endl;
>     cin.ignore();
>     list<int> foo;
>     for (int i=0; i<n; i++)
>        foo.push_back(1);
>     cout << "Press enter to free " << n << " numbers" << endl;
>     cin.ignore();
> }
>
> int main()
> {
>     strings_test();
>     int_test();
>     return 0;
> }
> ----
>
>
> While you execute this program, keep watching the memory your program
> consumes. You'll see that copying strings doesn't duplicate the data,
> they share the same representation until you change one of them. With
> this program you can also compare the size alocated by both the string
> list and an int list.
>
> Daniel K. O.
>
>
>
>
> -------------------------------------------------------
> This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170
> Project Admins to receive an Apple iPod Mini FREE for your judgement on
> who ports your project to Linux PPC the best. Sponsored by IBM.
> Deadline: Sept. 24. Go here: http://sf.net/ppc_contest.php
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users

> -----Original Message-----
> From: dev...@li...
> [mailto:dev...@li...]On Behalf Of Daniel K.
> O.
> Sent: Saturday, September 18, 2004 2:51 PM
> To: zw...@he...
> Cc: dev...@li...
> Subject: Re: [Dev-C++] How to work with *.txt files??
>
>
> ZwiQ wrote:
>
> > I assume that assigning pointers isn't as resourcesconsuming as
> > assigning strings?
>
>
> Most STL implementations (including GCC) provide an efficient way to
> copy a string. In Stroustrup's book he illustrates a basic string
> implementation this way.
> Try it youself:
>
> ----
> #include <string>
> #include <vector>
> #include <iostream>
>
> using namespace std;
>
> const int n = 10000000; // just any big number
>
> void strings_test()
> {
>     cout << "Strings test, press enter to start" << endl;
>     cin.ignore();
>     string msg =
> "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklm
> nopqrstuvwxyz";
>     list<string> foo;
>     for (int i=0; i<n; i++)
>        foo.push_back(msg);
>     cout << "Press enter to free " << n << " strings" << endl;
>     cin.ignore();
> }
>
> void int_test()
> {
>     cout << "Int test, press enter to start" << endl;
>     cin.ignore();
>     list<int> foo;
>     for (int i=0; i<n; i++)
>        foo.push_back(1);
>     cout << "Press enter to free " << n << " numbers" << endl;
>     cin.ignore();
> }
>
> int main()
> {
>     strings_test();
>     int_test();
>     return 0;
> }
> ----
>
>
> While you execute this program, keep watching the memory your program
> consumes. You'll see that copying strings doesn't duplicate the data,
> they share the same representation until you change one of them. With
> this program you can also compare the size alocated by both the string
> list and an int list.
>
> Daniel K. O.
>
>
>
>
> -------------------------------------------------------
> This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170
> Project Admins to receive an Apple iPod Mini FREE for your judgement on
> who ports your project to Linux PPC the best. Sponsored by IBM.
> Deadline: Sept. 24. Go here: http://sf.net/ppc_contest.php
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users

Re: [Dev-C++] How to work with *.txt files??

[Daniel K. O. <dan...@ya...>]

ZwiQ wrote:

> I assume that assigning pointers isn't as resourcesconsuming as 
> assigning strings?


Most STL implementations (including GCC) provide an efficient way to 
copy a string. In Stroustrup's book he illustrates a basic string 
implementation this way.
Try it youself:

----
#include <string>
#include <vector>
#include <iostream>

using namespace std;

const int n = 10000000; // just any big number

void strings_test()
{
    cout << "Strings test, press enter to start" << endl;
    cin.ignore();
    string msg = 
"abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz";
    list<string> foo;
    for (int i=0; i<n; i++)
       foo.push_back(msg);
    cout << "Press enter to free " << n << " strings" << endl;
    cin.ignore();
}

void int_test()
{
    cout << "Int test, press enter to start" << endl;
    cin.ignore();
    list<int> foo;
    for (int i=0; i<n; i++)
       foo.push_back(1);
    cout << "Press enter to free " << n << " numbers" << endl;
    cin.ignore();
}

int main()
{
    strings_test();
    int_test();
    return 0;
}
----


While you execute this program, keep watching the memory your program 
consumes. You'll see that copying strings doesn't duplicate the data, 
they share the same representation until you change one of them. With 
this program you can also compare the size alocated by both the string 
list and an int list.

Daniel K. O.

Re: [Dev-C++] How to work with *.txt files??

[ZwiQ <zw...@he...>]

Per Westermark wrote:

> <>Ouch.
>
> Don't do that.
>
> There is the vector template class in the stl.

(Hielke blames himself for not reading a good C++ book himself :o)

Hm, you're right. Thanks! I said I would use a vector but in the code I 
did use an simple array. Now I think of it, the code I wrote down there 
without good thinking was ment to store an array of pointers to strings, 
not strings themselves. Used it mainly when I had to reorganize the 
order of the stored strings with manipulation members (eg. sort).
I assume that assigning pointers isn't as resourcesconsuming as 
assigning strings? However, you're still right about the complexity. 
Vector operations themselves all are lineair? So I should use a vector 
in that case too as well?

Regards,
    Hielke
    Zw...@he...

> <>Do not write a method that reallocates all strings every time.
>
> First line - allocate one string.
> Second line - allocate two strings.
> Third line - allocate three strings.
> ...
>
> By doing this, you manage to transform a linear operation - proportional
> to number of lines in the file - to become O(n^2).
>
> If you open a 100,000 line file, you would perform 100,000^2 / 2 or
> 5,000,000,000 string assigns.
>
> Never add complexity when it isn't needed.
>
> std::vector<std::string> strings;
>
> and then
>
> strings.push_back(line);
>
> or
>
> strings.reserve(10);
> strings[n++] = line;
>
> is a lot nicer code, and tremendously much more efficient.
>
> /Per W
>
> On Sat, 18 Sep 2004, hielke_prins wrote:
>
>>>>How do I refer to each line of my *.txt file???
>>>>        
>>>>
>>/*
>>   If you don't have any clue how to read a simple textfile, the first
>>thing you
>>   proably have to do is buying a good book on C(++). But here ya go.
>>
>>   I usually read small plaintext files in a vector using a simple
>>wrapperclass.
>>   Something like this (if you meant to write it in C++ at least),
>>didn't test it:
>>*/
>>
>>Class Lines
>>{
>>   string *d_line;
>>   unsigned d_nLines;
>>
>>  public:
>>   Lines(istream streamIn);
>>   /*
>>       (of course you need some simple memberfunctions
>>       returning linecount and lines on a given index too)
>>   */
>>}
>>
>>Lines::Lines(istream streamIn)
>>:
>>   d_nLines(0)
>>{
>>   string inputLine,
>>       *tempLine;
>>
>>   while(getline(streamIn, inputLine))
>>   {
>>       d_nLines++;
>>       tempLine = new string[d_nLines];
>>       for(unsigned i = 0; i < d_nLines; i++)
>>       {
>>           tempLine[i] = d_line[i];
>>       }
>>       delete d_line;
>>       d_line = tempLine;
>>   }
>>}
>>
>>Regards,
>>   Hielke
>>    
>>
>
>
>  
>

Re: [Dev-C++] How to work with *.txt files??

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

Ouch.

Don't do that.

There is the vector template class in the stl.

Do not write a method that reallocates all strings every time.

First line - allocate one string.
Second line - allocate two strings.
Third line - allocate three strings.
...

By doing this, you manage to transform a linear operation - proportional
to number of lines in the file - to become O(n^2).

If you open a 100,000 line file, you would perform 100,000^2 / 2 or
5,000,000,000 string assigns.

Never add complexity when it isn't needed.

  std::vector<std::string> strings;

and then

  strings.push_back(line);

or

  strings.reserve(10);
  strings[n++] = line;

is a lot nicer code, and tremendously much more efficient.

/Per W

On Sat, 18 Sep 2004, hielke_prins wrote:

> >> How do I refer to each line of my *.txt file???
>
> /*
>    If you don't have any clue how to read a simple textfile, the first
> thing you
>    proably have to do is buying a good book on C(++). But here ya go.
>
>    I usually read small plaintext files in a vector using a simple
> wrapperclass.
>    Something like this (if you meant to write it in C++ at least),
> didn't test it:
> */
>
> Class Lines
> {
>    string *d_line;
>    unsigned d_nLines;
>
>   public:
>    Lines(istream streamIn);
>    /*
>        (of course you need some simple memberfunctions
>        returning linecount and lines on a given index too)
>    */
> }
>
> Lines::Lines(istream streamIn)
> :
>    d_nLines(0)
> {
>    string inputLine,
>        *tempLine;
>
>    while(getline(streamIn, inputLine))
>    {
>        d_nLines++;
>        tempLine = new string[d_nLines];
>        for(unsigned i = 0; i < d_nLines; i++)
>        {
>            tempLine[i] = d_line[i];
>        }
>        delete d_line;
>        d_line = tempLine;
>    }
> }
>
> Regards,
>    Hielke

Re: [Dev-C++] How to work with *.txt files??

[hielke_prins <hie...@he...>]

>> How do I refer to each line of my *.txt file???
=20
/*
   If you don't have any clue how to read a simple textfile, the first=20
thing you
   proably have to do is buying a good book on C(++). But here ya go.
=20
   I usually read small plaintext files in a vector using a simple=20
wrapperclass.
   Something like this (if you meant to write it in C++ at least),=20
didn't test it:
*/
=20
Class Lines
{
   string *d_line;
   unsigned d_nLines;
=20
  public:
   Lines(istream streamIn);
   /*
       (of course you need some simple memberfunctions
       returning linecount and lines on a given index too)
   */
}
=20
Lines::Lines(istream streamIn)
:
   d_nLines(0)
{
   string inputLine,
       *tempLine;
=20
   while(getline(streamIn, inputLine))
   {
       d_nLines++;
       tempLine =3D new string[d_nLines];
       for(unsigned i =3D 0; i < d_nLines; i++)
       {
           tempLine[i] =3D d_line[i];
       }
       delete d_line;
       d_line =3D tempLine; =20
   }
}
=20
Regards,
   Hielke

Re: [Dev-C++] I need information about information

[Daniel K. O. <dan...@ya...>]

Claudio Martn Veas wrote:

>Hi, I was looking for information about C/C++
>graphical interfaces programming for linux, where can
>I get this kind of information?
>

You want GUI toolkits.
Go to http://www.atai.org/guitool/
Then choose the one you want. Some come with big frameworks, like 
wxWidget, others come just with the minimum needed, like FLTK. Go to the 
websites and see examples of each library, then chose the one you feel 
more confortable.


Daniel K. O.

[Dev-C++] I need information about information

[Claudio M. V. <cm...@ya...>]

Hi, I was looking for information about C/C++
graphical interfaces programming for linux, where can
I get this kind of information? you know to make
windows and stuffs?  Please excuse my english is not
very good because im from Argentina and its been a
while since the last time I used it.
If theres anything else you need to know to help me
just ask. 
Thanks on advance
Claudio Veas



	
	
		
___________________________________________________________
100mb gratis, Antivirus y Antispam
Correo Yahoo!, el mejor correo web del mundo
http://correo.yahoo.com.ar

Re: [Dev-C++] two versions of DEV C++

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

You don't want the old version 4. Uninstall both the old working and the
new broken, and then install again a new version. It may be called "beta"
but that is just a formality - someday they will decide to call it version
5. I don't think any real Dev-C++ users are running with version 4. The
functional difference is just too large!

/Per W

On Fri, 17 Sep 2004, Eric wrote:

> I seem to have two versions of DEV C++
>
> one is called Bloodshed DEV C++, version 4.9.8.0 is a lot of rubbish,
> keeps saying "source file not compiled" when I try and run it.
>
>
> The other version I have is just DEV C++, version 4 and it just runs OK
>
>
>
>
> Can anybody expand on my report.
>
> >From Eric
>
>
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.766 / Virus Database: 513 - Release Date: 17-Sep-04
>
>
>
> -------------------------------------------------------
> This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170
> Project Admins to receive an Apple iPod Mini FREE for your judgement on
> who ports your project to Linux PPC the best. Sponsored by IBM.
> Deadline: Sept. 24. Go here: http://sf.net/ppc_contest.php
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>

[Dev-C++] two versions of DEV C++

[Eric <eri...@cl...>]

I seem to have two versions of DEV C++

one is called Bloodshed DEV C++, version 4.9.8.0 is a lot of rubbish,
keeps saying "source file not compiled" when I try and run it.


The other version I have is just DEV C++, version 4 and it just runs OK




Can anybody expand on my report.

From Eric



---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.766 / Virus Database: 513 - Release Date: 17-Sep-04

[Dev-C++] How to work with *.txt files??

[Alexsandro M. <ale...@ho...>]

Please,

I've just made a script to work with sentences, but I could not realize how 
to work with each word in a *.txt file.

Ex.: I've got teste.txt with the following words: cabeça, abóbora, jiló, 
menino.

I want to tokenize these words with my script and separate theirs syllables. 
How do I refer to each line of my *.txt file???

Thanks in advance!!!

_________________________________________________________________
MSN Hotmail, o maior webmail do Brasil.  http://www.hotmail.com

[Dev-C++] Problems Updating

[Jingles P. <jin...@ya...>]

Hello,

Now, awhile ago I started having problems with
Updating Dev-Cpp. When ever I updated it I couldn't do
it, It wouldn't connect to the Server and when It did
there was no difference in the Version Number, nor a
difference in anything with it.

Could somebody please tell whats going on?! Or if its
just something normal.


		
__________________________________
Do you Yahoo!?
Yahoo! Mail - Helps protect you from nasty viruses.
http://promotions.yahoo.com/new_mail

Re: [Dev-C++] inline functions

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

Scope isn't a problem. The compiler knows the scope the function was
declared in and can declare variables and references based on that.

However, pointer indirection is a problem.  Virtual functions will require
that the compiler is really sure about the type of the class for them to
be inlined.

What is inlined varies tremendously between different compilers and
compiler versions. Some compilers can't handle specific language
constructs when inlining. Some compilers can handle anything, but instead
uses the expansion size to decide if the function should be inlined or
not.

/Per W

On Thu, 16 Sep 2004, [ISO-8859-2] OROSZI Bal=E1zs wrote:

> Hi!
>
> I have questions regarding inline functions.
> What can be inlined? What makes a function un-inlineable?
> And what kind of pre-processing does a compiler do to the body of an inli=
ne function (like
> removing the return statement, scopes, etc.)?
>
> For example: what happens if an inline function of a class calls another =
class member,
> like this will it be inlined?
>
> I'm just curious, because there can be things, which are valid inside the=
 class, but
> because of inlining, the body gets "outside" of the class scope, which ma=
kes a lot of
> things different.
>
> Any thoughts?
>
> --
> Greetings,
>    Bal=E1zs
>
>
>
> -------------------------------------------------------
> This SF.Net email is sponsored by: thawte's Crypto Challenge Vl
> Crack the code and win a Sony DCRHC40 MiniDV Digital Handycam
> Camcorder. More prizes in the weekly Lunch Hour Challenge.
> Sign up NOW http://ad.doubleclick.net/clk;10740251;10262165;m
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> TO UNSUBSCRIBE: http://www23.brinkster.com/noicys/devcpp/ub.htm
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>

[Dev-C++] inline functions

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

Hi!

I have questions regarding inline functions.
What can be inlined? What makes a function un-inlineable?
And what kind of pre-processing does a compiler do to the body of an inli=
ne function (like=20
removing the return statement, scopes, etc.)?

For example: what happens if an inline function of a class calls another =
class member,=20
like this will it be inlined?

I'm just curious, because there can be things, which are valid inside the=
 class, but=20
because of inlining, the body gets "outside" of the class scope, which ma=
kes a lot of=20
things different.

Any thoughts?

--
Greetings,
   Bal=E1zs