Re: [DEV-C++] BUG: Dev-C 4.9.20 consolprogram has only access to 1MB memory.

[staale <st...@le...>]

Hi Ioannis,

As I'm not a seasoned C++ programer I welcom your your work on my code, and
your efforts in this mailing list.:o)

To be shure I test again and with som simpler code and it still fails on a
NT4-Sp6 (and w2k) with Dev-C 4.9.20 (Clean new installation of the computer,
also the OS!!)

I't works on a NT4-Sp6 with Dev-C 4.0

See also the 'tread'
    [Dev-C++] not enough memory - how to configure Win2000
which is the reaason form my involvement.

----------- Code -------------
#include <stdlib.h>

int main()
{

  // 1MB = 1048576 = 1*1024*1024
  // 2MB = 2097152 = 2*1024*1024
 // 31MB = 32505856
  char narr[2097152];

  system("PAUSE");
  return 0;
}
----------- Code End -------------

Best Regards
Staale Flock



----- Original Message -----
From: "Ioannis Vranos" <no...@ho...>
To: "Dev-C++ Mailing List" <dev...@li...>
Sent: Friday, May 10, 2002 4:51 AM
Subject: RE: [DEV-C++] BUG: Dev-C 4.9.20 consolprogram has only access to
1MB memory.


> Your code fixed:
>
> #include <iostream>
> file://-->Not needed
> // #include <stdio.h>
> #include <stdlib.h>
>
> file://--> You do not use argc,  argv[] so why you declare them?
> int main(int argc, char *argv[])
> {
>   using namespace std; // --> necessary
>
>   const long MEGA_BYTE = 1024*1024;
>
>   long nMBSize = 1;
>
>   while (nMBSize != 0 ){
>     cout << "Give MB size: ";
>     cin >> nMBSize;
>
>     file://--> Illegal in ANSI C++. The sizes of arrays in the stack must
be
> constants
>     file://--> char narrBig[nMBSize * MEGA_BYTE];
>
>     char *narrBig=new char[nMBSize*MEGA_BYTE];
>
>
>     file://--> Useless. sizeof(char) is always 1 byte
>    file://cout << "char size: " << sizeof(char) << " Bytes." <<  endl;
>
>    file://-->You can't do that on an array on the free store.
>    // Here it returns the size of char *
>    //   cout << "Array size: " << sizeof(narrBig)<< " Bytes." << endl;
>    file://See if initializing each element makes a difference
>    for (unsigned long i = 0; i<nMBSize*MEGA_BYTE;i++){
>       narrBig[i] = 'A';
>    }//i
>    file://--> Useless. cout << "Array size: " << sizeof(narrBig) << endl;
>    file://If you store objects in the array remember to use:
>    delete [] narrBig;
> file://--> This could be disastrous when applied on a built in array as
you
> had done
>
>
> }//while (nMB..
> file://To have a breake before window closes, use:
>   system("PAUSE");
>   return 0;
> }
>
>
> ====
>
>
> How i would do it in your case:
>
>
> #include <iostream>
> #include <cstdlib>
> #include <vector>
>
>
> int main()
> {
>   using namespace std;
>
>   const unsigned long MEGA_BYTE = 1024*1024;
>
>   long nMBSize;
>
>   do
>   {
>     cout << "\nGive MB size: ";
>     cin >> nMBSize;
>
>     vector<char> narrBig(nMBSize*MEGA_BYTE);
>
>     cout << "Array contents size: " << narrBig.size()<< " Bytes." <<
> endl;
>
>     for (unsigned long i = 0; i<nMBSize*MEGA_BYTE;i++)
>        narrBig[i] = 'A';
>
>     cout << "Array contents size: " << narrBig.size()<< " Bytes." <<
> endl;
>
>     // vector is destroyed at the end of its scope, and its contents are
> cleared
>    }while (nMBSize!=0);
>
> file://To have a break before window closes, use:
>   system("PAUSE");
>
>   return 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 staale
> > Sent: Friday, May 10, 2002 4:46 AM
> > To: jar...@be...; ha...@bl...; Dev-Cpp
> > Subject: [DEV-C++] BUG: Dev-C 4.9.20 consolprogram has only
> > access to 1MB memory.
> >
> >
> > Se also thread:
> >     [Dev-C++] not enough memory - how to configure Win2000
> > on the mailing list. Test code below
> >
> > Hi Helmuth,
> >
> > Turns out this has somthing to do with Dev-C 4.9.20.
> >
> > This is what I did to verify the problem:
> > 1: Tried your file on both w2k (Clean system) or NT4-Sp6. It
> > failed on both
> > machins.
> >
> > 2: I installed DEV-C 4.9.20 (downloaded today) on a clean w2k
> > machine and
> > encountered the same problem when I compiled and ran the code.
> >
> > 3: Tried to uninstall DEV-C 4.9.20. Uninstal DOES NOT work.
> > Delete the fiels
> > manualy. Search for dev-c in regedit.exe and then run
> > RegClean.exe just
> > search for RegClean and you should be well of (Might not nead
> > this see pkt
> > 5)
> >
> > 4: Installed DEV-C 4.0 on the w2k machine  Compiled and
> > tested OK to 31MB.
> >
> > 5: Installed Dev-c 4.9.20 on top of the 4.0 and It still
> > worked nicely..:o)
> >
> > 6: Installed Dev-C 4.9.20 on NT4-SP6 (Only Winzip appart from
> > OS). Added
> > shlwapi.dll and wininet.dll to system32 folder. Tried to run
> > the code but
> > no. Same failure.
> >
> > 7: Installed Dev-C 4.0 on top of the 4.9.20. This did not
> > help. Brobably
> > because both installers does not overwrite existing header
> > files (?). So you
> > should delete the 4.9.x installaation. Install 4.0 and then
> > 4.9.x (if you
> > nead it. It is a must if you want to use the wxWindows lib,
> > if I understand
> > right)
> >
> >
> > I'm not a seasoned C developer but would gues there are
> > somthing wrong with
> > a header file or reference making dev-c 4.9.x compile to
> > 16bit code(???)
> >
> > Best regards
> > Staale Flock
> >
> > ------------------- Code
> > Start --------------------------------------------------------
> > //////////////////////////////////////////////////////////////
> > //////////////
> > ///////////////////////////////////////////////////
> > // this code fails if you install Dev-C 4.9.20 on a new w2k
> > machine and try
> > to access
> > // more than 1MB memory. (Enter any number higher than 1).
> > //////////////////////////////////////////////////////////////
> > //////////////
> > ///////////////////////////////////////////////////
> >
> > #include <iostream>
> > #include <stdio.h>
> > #include <stdlib.h>
> >
> >
> > int main(int argc, char *argv[])
> > {
> > const long MEGA_BYTE = 1024*1024;
> > long nMBSize = 1;
> > while (nMBSize != 0 ){
> >    cout << "Give MB size: ";
> >    cin >> nMBSize;
> >    char narrBig[nMBSize * MEGA_BYTE];
> >    cout << "char size: " << sizeof(char) << " Bytes." <<  endl;
> >    cout << "Array size: " << sizeof(narrBig)<< " Bytes." << endl;
> >    file://See if initializing each element makes a difference
> >    for (unsigned long i = 0; i<nMBSize*MEGA_BYTE;i++){
> >       narrBig[i] = 'A';
> >    }//i
> >    cout << "Array size: " << sizeof(narrBig) << endl;
> >    file://If you store objects in the array remember to use:
> >    delete []narrBig;
> > }//while (nMB..
> > file://To have a breake before window closes, use:
> >   system("PAUSE");
> >   return 0;
> > }
> >
> > ------------------- Code end --------------------------------->
>
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