fstream open/close

[mickey]

hi, my app is similar this below:

fstream file;
while ((choice=getchar()) != '0' ) { 
     if (!file.open(file_name.c_str(), std::ios_base::in)) {  //read only
		if ((file()).eof())
			cout << "end file \n";					
		cerr << "unable to open that file\n";
		return -1;
	}       
 	while ( c=file.get(); ) { 
		cout.put(ch); 
	}	
      	f.close();
}

fstream file;
while ((choice=getchar()) != '0' ) { 
     if (!file.open(file_name.c_str(), std::ios_base::in)) {  //read only
		if ((file()).eof())
			cout << "end file \n";					
		cerr << "unable to open that file\n";
		return -1;
	}       
 	while ( c=file.get(); ) { 
		cout.put(ch); 
	}	
      	f.close();
}

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I read all file and at the end of first cycle I close the file; but the second cycle, program terminate because file seems to be at the end. Why? I supposed if I close and re-open it goes at begin....thanks