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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