C++ File Handling EOF

C++ File Handling EOF

In the previous article we have discuss about Error Handling in file operation.If you have not gone through it you see through this link Error Handling. In this article we will learn more about eof()  

                               Introduction to eof()

You can detect when the end of the file is reached by using the member function eof() which has prototype.
  •  int eof();
It returns non-zero when the end of file has been reached, otherwise it returns zero.

For example

ifstream fi ;
fi.open("cppsecrets", ios::in | ios::binary);
: //process the file
cout << "You have reached the end of file! \n"

The above code fragment processes a file as long as it EOF is not reached. It uses eof() function with the stream object to check for the file's end.

   Rules for using end-of-file (eof( ))

1.  Always test for the end-of-file condition before processing data read from an input file stream.
     a.  use a priming input statement before starting the loop
     b.  repeat the input statement at the bottom of the loop body
2.  Use a while 
loop for getting data from an input file stream.  A for loop is desirable only when you know the exact number of data items in the file, which we do not know.


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