From: Waldemar Schultz <schultz AT ma DOT tum DOT de>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: File
Date: Tue, 22 Feb 2000 17:45:44 +0100
Organization: [posted via] Leibniz-Rechenzentrum, Muenchen (Germany)
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Florian X schrieb:
> 
> Hi!
> 
> I use this in my program:
> 
> char *string= "Hello world";
> FILE * f = fopen("file.txt", "a");
> fprintf(f, "%-128s", string);
> 
> // ftell(f);
> 
> fclose(f);
> 
> But it doesn't write the text to the file, if i use ftell(...) after
> fopen(...), ftell(...) returns -1 (error);
> 
> ftell

I tried this with gcc and it works as expected.

=======================================
#include <stdio.h>

int main(void)
{
char *string= "Hello world";
FILE * f = fopen("file.txt", "a");

 if(!f)
 {
  perror("file.txt");
  return 1;
 }
 fprintf(f, "%-128s\n", string);

 printf("%ld\n",ftell(f));

 fclose(f);

 return 0;
}
=======================================
Try this standalone. May be you currupted your system elsewhere
and now you stare at the wrong place. hope that helps.