From: "Michael Nöthe" <M DOT Noethe AT t-online DOT de>
Newsgroups: comp.os.msdos.djgpp
Subject: Problem with while-loop
Date: Sat, 04 Sep 1999 23:56:31 +0200
Organization: T-Online
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To: djgpp AT delorie DOT com
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Dies ist eine mehrteilige Nachricht im MIME-Format.
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First of all, I'm a beginner in C++ and I hope I am at the right place
in this newsgroup.
I bought a book on learning C++ and along with it I got a copy of 
the GNU-C++ Compiler V. 2.7.2.1 for DOS from DJGPP.
In the book there was a sample program introducing encapsulated
while-loops. A turning line (\|/-) should be shown on the screen.
Now my problem is, the program doesn't seem to do anything !
It compiles without any problems, but when I execute it, it shows
nothing on the screen.
After I finally use <CTRL+BREAK> to stop the programm, only the last
charakter (e.g.: "\") is shown.
I took the source code right from the CD I got with my book, so there
can't be any typing errors.
On the CD there is also an executable program, which runs perfectly !
 
Does anybody have a clue what might be the problem ?

I enclosed the following things :  - my environment variables	 
environ.lst
				   - compiler startup messages	  go32.lst
			    	   - the problematic source code  rotsl.cpp
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COMSPEC=A:\COMMAND.COM
PROMPT=$p$g
PATH=C:\DOS;C:\MOUSE;C:\NC;C:\RAR;D:\MAPLE\BIN;C:\DJGPP\BIN
DJGPP=C:\DJGPP\DJGPP.ENV
GO32_V2_DEBUG=y
TEMP=C:\TEMP
TMP=C:\TEMP
TMPDIR=I:
MAPLELIB=D:\MAPLE\LIB




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go32/v2 version 2.0 built Aug 12 1996 22:27:23
Usage: go32 coff-image [args]
Rename this to go32.exe only if you need a go32 that can run v2 binaries as
 well as v1 binaries (old makefiles).  Put ahead of the old go32 in your PATH
 but do not delete your old go32 - leave it in the PATH after this one.
Set GO32_V2_DEBUG=y in the environment to get verbose output.

DPMI memory available: 15155 Kb
DPMI swap space available: 130397 Kb




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/*------------------------------ ROTSL.CPP ------------------------------*
 |                                                                       |
 |   ROTSL erzeugt einen rotierenden Strich mit Hilfe einer Endlos-      |
 |   Schleife. Die Ablaufgeschwindigkeit wird durch Pausen in Form       |
 |   von Z„hlschleifen reduziert.                                        |
 |                                                                       |
 *-----------------------------------------------------------------------*/

#include <stdio.h>                                               // printf


void main()
{
  double cnt;


  while(1)                                               // Endlosschleife
   {
     printf ("|");                                     // Zeichen ausgeben
     cnt = 0.0;                             // Z„hlvariable initialisieren
     while(cnt < 100000.0)                                       // Pause
      cnt++;
     printf("\b");              // Ausgabe-Position 1 Zeichen zur�cksetzen

     printf ("/");                                     // Zeichen ausgeben
     cnt = 0.0;                             // Z„hlvariable initialisieren
     while(cnt < 100000.0)                                        // Pause
      cnt++;
     printf("\b");              // Ausgabe-Position 1 Zeichen zur�cksetzen

     printf ("-");                                     // Zeichen ausgeben
     cnt = 0.0;                             // Z„hlvariable initialisieren
     while(cnt < 100000.0)                                        // Pause
      cnt++;
     printf("\b");              // Ausgabe-Position 1 Zeichen zur�cksetzen

     printf ("\\");                                    // Zeichen ausgeben
     cnt = 0.0;                             // Z„hlvariable initialisieren
     while(cnt < 100000.0)                                        // Pause
      cnt++;
     printf("\b");              // Ausgabe-Position 1 Zeichen zur�cksetzen

   }                                                         // Ende while
}                                                             // Ende main

/*=========================== ENDE ROTSL ===============================*/





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