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[Condor-users] condor rewrites my file instead of reading it, why???

I did a small test with condor,it seems something wrong.
//the "test.cpp"
//function: Read a float number from an existing file config.ini,
//and write it to another new file test.txt
#include "stdio.h"
#include "fstream.h"
void main()
 ifstream  fin;  //define an input file stream
 fin.open("config.ini"); //  open the existing non-empty config.ini file
 float c;
 fin>>c;  // read the float number to variable c
 ofstream fout("test.txt"); //define an output file
 fout<<c; //output c to test.txt
It runs correctly itself. But when i submit it to condor,the config.ini was rewrote to be empty.
  I am a new user , can anybody help me ???Thank you very much
Other informations:
1. I use the windows 2000 server with visual c++ on it , and the condor central manager.
2. the submit file is test.sub:
    Executable = test.exe
    Universe = vanilla
3. before submitting,the config.ini  is 11.111 , 1KB
                              the test.txt  is   empty,  0KB
  after the job run , the config.ini  is empty, 0KB
                              the test.txt  is   -1.07374e+008,  1KB
4.test.exe is the vc++'s executable file first in the debug directory.
you need to form it and place it in the same directory with config.ini .
5. when the test.exe runs itself, the result is :
         the config.ini  is 11.111 , 1KB 
         the test.txt  is   11.111 ,  1KB
Thank you very much !!!

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