problem with fstream

[ivotron]

Hi,

I have very strange problem with std::fstream. I want to read a simple two-column space-separated file with the following code:

#include <iostream>
#include <fstream>

int main()
{
   std::ifstream file("file.txt");
   unsigned long oldval;
   unsigned long newval;

   while(!file.eof()) {
      file >> oldval;
      file >> newval;
      std::cout << oldval << " " << newval << std::endl;
   }
}

The file.txt contains ten lines only:

3036679276 4677957
3233819949 6457113
3602920021 7347886
6236944672 16846074
2487223488 3069408
2818574689 4363018
5419052468 13941073
9172944933 31529903
2818574690 4363020
9172944938 31529909

As output, I get an endless printing of the 3rd line. I have tried a lot of variants, like:

while(file>>oldval>>newval)
while(file.good())

and I always get the same behavior. It looks like the seek internal pointer of fstream is not moving. Any clues about this? I'm in RH with GCC3.4. Thanks for your time.

[ivotron]

Hi,

Still trying to solve this. I'm trying reading each line and then, with std::stringstre am, pass

int main()
{
   std::ifstream file("file.txt");
   unsigned long oldval;
   unsigned long newval;
   std::string line;

   while(!file.eof()) {
      std::getline(file, line);
      std::stringstream linestream(line);
      linestream >> oldval;
      linestream >> newval;
      std::cout << oldval << " " << newval << std::endl;
   }
}

I get the following:

3036679276 4677957
3233819949 6457113
3602920021 7347886
3602920021 7347886
2487223488 3069408
2818574689 4363018
2818574689 4363018
2818574689 4363018
2818574690 4363020
2818574690 4363020
2818574690 4363020

????? I don't get it :S Any ideas??? I'm starting to believe that my computer is possessed

[ivotron]

Hi,

Still trying to solve this... I've printed the put pointer, to know if its moving:

int main()
{
   std::ifstream file("file.txt");
   unsigned long oldval;
   unsigned long newval;

   while(!file.eof()) {
      file >> oldval;
      file >> newval;
      std::cout << oldval << " " << newval << std::endl << file.tellg() << std::endl;
   }
}

I get always -1. I also reinstalled gcc.