how to check end of file ?

This is a discussion on how to check end of file ? within the C++ Programming forums, part of the General Programming Boards category; Code: ifstream fin( "file.dat") ; while(fin) // end of file checking { // do something } question 1 : fin ...

  1. #1
    Registered User
    Join Date
    Dec 2003
    Posts
    92

    Question how to check end of file ?

    Code:
    ifstream fin( "file.dat") ;
    
    while(fin) // end of file checking
    {
    // do something
    }
    question 1 :
    fin is a object. it is not a boolean variable . so how can i use this to check end of file ?




    question2:
    what are other ways i can check end of file ?

    thanks
    blue_gene

  2. #2
    Code Goddess Prelude's Avatar
    Join Date
    Sep 2001
    Posts
    9,796
    >fin is a object. it is not a boolean variable
    It does, however, have an implicit conversion operator that allows it to be used in a boolean context.

    >so how can i use this to check end of file ?
    You don't, that's not a sound way to do it.

    >what are other ways i can check end of file ?
    One way (assuming string input):
    Code:
    while ( getline ( fin, str ) ) {
      ...
    }
    Another way:
    Code:
    for ( ; ; ) {
      // Get input
      if ( fin.eof() )
        break;
      ...
    }
    Naturally the first is preferable if you can manage it. I can't be more specific since you didn't say what you are using for input.
    My best code is written with the delete key.

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