- World's Largest Collection of Interview Questions
Start Your Own website Now
Sponsored Links

Interview Questions
Our Services

Get 9,000 Interview Questions & Answers in an eBook.

  • 9500+ Pages
  • 9000 Question & Answers
  • All Tech. Categories
  • 14 MB Content

    Get it now !!

    Send your Resume to 6000 Companies

    Question :
    How can I find out the size of a file, prior to reading it in?
    Category C Interview Questions
    Rating (0.3) By 10 users
    Added on 11/17/2011
    Views 200
    Rate it!

    If the ``size of a file'' is the number of characters you'll be able to read from it in C (or which were written to it by a previous program), it can be difficult or impossible to determine this number exactly (other than by reading the whole file).
    Under Unix, the stat call (specifically, the st_size field of the stat structure) will give you an exact answer.Several other systems supply a Unix-like stat call, but the sizes reported for text files may be approximate (due to differing end-of-line representations; . You can open the file and use fstat, or fseek to the end of the file and then use ftell, but these tend to have the same problems: fstat is not portable, and generally tells you the same thing stat tells you; ftell is not guaranteed to return a byte count except for binary files (but, strictly speaking, binary files don't necessarily support fseek to SEEK_END at all). Some systems provide functions called filesize or filelength, but these are obviously not portable, either.
    Are you sure you have to determine the file's size in advance? Since the most accurate way of determining the size of a file as a C program will see it is to open the file and read it, perhaps you can rearrange the code to learn the size as it reads. (In general, your program should behave gracefully if the number of characters actually read does not match prior expectations, since any advance determination of the size might be approximate.)

    If you have the better answer, then send it to us. We will display your answer after the approval.
    Rules to Post Answers in

  • There should not be any Spelling Mistakes.
  • There should not be any Gramatical Errors.
  • Answers must not contain any bad words.
  • Answers should not be the repeat of same answer, already approved.
  • Answer should be complete in itself.
  • Name :*
    Email Id :*
    Answer :*
    Verification Code Code Image - Please contact webmaster if you have problems seeing this image code Not readable? Load New Code
    Process Verification  Enter the above shown code:*
    Inform me about updated answers to this question

    Related Questions
    View Answer
    How can I find the modification date and time of a file?
    View Answer
    How can I insert or delete a line (or record) in the middle of a file?
    View Answer
    How can I delete a file?
    View Answer
    How do I copy files?
    View Answer
    Why cant I open a file by its explicit path?
    View Answer
    fopen isnt letting me open files like "$HOME/.profile" and "~/.myrcfile".
    View Answer
    How can I increase the allowable number of simultaneously open files?
    View Answer
    How can I find out how much free space is available on disk?
    View Answer
    How can I read a directory in a C program?
    View Answer
    How do I create a directory? How do I remove a directory (and its contents)?
    View Answer
    How can I find out how much memory is available?
    View Answer
    How can I allocate arrays or structures bigger than 64K?
    View Answer
    I thought that using large model meant that I could use more than 64K of data!
    View Answer
    How can I invoke another program (a standalone executable, or an operating system command) from within a C program?
    View Answer
    How can I call system when parameters (filenames, etc.) of the executed command arent known until run time
    View Answer
    How do I get an accurate error status return from system on MS-DOS?
    View Answer
    How can I invoke another program or command and trap its output?
    View Answer
    How can my program discover the complete pathname to the executable from which it was invoked?
    View Answer
    How can I automatically locate a programs configuration files in the same directory as the executable?
    View Answer
    How can I open files mentioned on the command line, and parse option flags?
    View Answer

    Please Note: We keep on updating better answers to this site. In case you are looking for Jobs, Pls Click Here - Best Freshers & Experienced Jobs Website.

    View ALL C Interview Questions

    User Options
    Sponsored Links

    Copyright ©2003-2015, All Rights Reserved.
    Privacy Policy | Terms and Conditions

    Download Yahoo Messenger | Placement Papers| FREE SMS | ASP .Net Tutorial | Web Hosting | Dedicated Servers | C Interview Questions & Answers

    Testing Articles | Testing Books | Testing Certifications | Testing FAQs | Testing Downloads | Testing Interview Questions | Testing Jobs | Testing Training Institutes

    Cache = 0.03125 Seconds