Re: [Dev-C++] error message

[<h.r...@gm...>]

> At 08.09 07/06/02 +0200, h.r...@gm... wrote:
> >...
> >At second:
> >In the following code is an error, but i cannot find it. Always if i type
> q
> >to finish the data entry i get a error message :
> >
> >testproj1.exe Fehler in Anwendung
> >Die Anweisung in "0x00401b21" verweist auf Speicher "0x00000000". Der
> >Vorgang "read konnte nicht auf dem Speicher durchgeführt werden...
> >
> >Codesnip:
> >
> >string SP(size_t n) {
> >   string s(n, ' ');
> >   return s;
> >}
> >
> >bool ReadDataKbd(const string &s) {
> >   ofstream out(s.c_str());
> >
> >   string ein;
> >
> >   cout << "Sollwert:" << SP(6);
> >   cin >> ein;
> >   out << ein << endl;
> >
> >   cout << "Untere Grenze: ";
> >   cin >> ein;
> >   out << ein << endl;
> >
> >   cout << "Obere Grenze:  ";
> >   cin >> ein;
> >   out << ein << endl;
> >
> >   bool finished;
> >   int cnt = 1;
> >   size_t w = 5;
> >
> >   do {
> >     if (cnt > 99) w = 3;
> >     else if (cnt > 9) w = 4;
> >
> >     cout << "Messwert " << cnt << SP(w);
> >     cin >> ein;
> >     if (finished = (ein[0] == 'q')) break;
> >     out << ein << endl;
> >     cnt++;
> >   } while (!finished);
> >
> >   out.close();
> >   return true;
> >}
> >
> >Thanks in advance
> >
> >greetings
> >Horst
> 
> 
> Hi,
> 
> I've added the following function "main" to test your program:
> 
> -------------
> int
> main()
> {
>     ReadDataKbd("test.out");
> }
> ------------
> 
> And found that the code works. i.e. I saw no extra output on the Dos box 
> where I was running. My answers to the questions asked by your program
> were
>  
> (sorry I could do no better since I do not understand the meaning of them
> :)
> 
> Sollwert:      aa
> Untere Grenze: bb
> Obere Grenze:  cc
> Messwert 1     dd
> Messwert 2     ee
> Messwert 3     q
> 
> and here is the output file
> 
> test.out
> --------
> aa
> bb
> cc
> dd
> ee
> --------
> 
> I use: Dev 4.9.3.0 (gcc 2.95) on Win98SE.
> 
> --
> Luigi
> gi...@li...
> 

thanks and sorry, but the error is on me, not in the code. I read some data,
try to calculate with it, but dont store them. The calculation function has
no data and gives the error. The correct function is:

string SP(size_t n) {
  string s(n, ' ');
  return s;
}
  
bool ReadDataKbd(const string &s) {
  ofstream out(s.c_str());
  
  string ein;
  
  cout << "Sollwert:" << SP(6);
  cin >> ein;
  out << ein << endl;
  
  cout << "Untere Grenze: ";
  cin >> ein;
  out << ein << endl;
  
  cout << "Obere Grenze:  ";
  cin >> ein;
  out << ein << endl;
  
  bool finished;
  int cnt = 1;
  size_t w = 5;
  
  do {
    if (cnt > 99) w = 3;
    else if (cnt > 9) w = 4;
           
    cout << "Messwert " << cnt << SP(w);
    cin >> ein;
    if (finished = (ein[0] == 'q')) break;
    out << ein << endl;
    cnt++;
  } while (!finished);
  
  out.close();
  return true;
}

and again, sorry for my stupid question

greetings
Horst

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