c++ - Why is the operand receiving an error message from binary expression? -

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I am getting the following error:

Comparison between empty and non-indexing ( There is a code here for 'aka' ('original_first') and bin) binary expression (stream aka ('original_fstream') and long))

The reason for this is: 

  int main () {int arr [20] [6]; Fstream dataFile ("input.txt", iOS :: In); String input; Int I, I = 0; If (datafile == faucet) // error is on this line {cout & lt; & Lt; "Can not open file" & lt; & Lt; Endl; Return 0; }}    
 
 
 You might be following a tutorial that is pre-C ++ 11 and you are using a C + 11 compiler before C ++ 11, there was a  operator zero *  conversion operator in section squares, where a tap pointer would represent a bad position . In C ++ 11, it was changed to  Clear Operator Bull  conversion operator, which returns  false  if the stream is in bad condition, then you can get your  if < / Code> statement should be changed:  
  If (! Datafile)   
 In fact, it is always a idiomatic way to look at the state of a stream ( Because this pre-C ++ 11 also works).

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