[ROOT] Using fstream.h in ROOT 3.01/06

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Hi there,

can anyone explain why the following script runs in ROOT 2.25/03, but not 
3.01/06. Also I would appreciate if someone could explain an alternative method 
for reading/writing files that is supported under 3.01.

{
  #include <fstream.h>
  ifstream data;
  int valid=0;
  data.open("output.dat", ios::in);
  if(data.fail())
    cout << "file not found"<<endl;
  else
    cout << "file loaded"<<endl;
}

The error I get is:

Error: class,struct,union or type ios not defined  FILE:test.C LINE:5
Error: class,struct,union or type ios not defined  FILE:test.C LINE:5
Error: No symbol ios::in in current scope  FILE:test.C LINE:5
*** Interpreter error recovered ***

Thanks in advance
Chris

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