Book Administration in C Accent

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 31 December 18:00   


In this section, we will altercate about files which are actual important for all-embracing


data processing. Data are stored in data files and programs are stored in program


files .


What is a File?


Abstractly, a book is a accumulating of bytes stored on a accessory accumulator device,


which is about a deejay of some kind. The accumulating of bytes may be interpreted,


for example, as characetrs, words, lines, paragraphs and pages from a textual


document; fields and annal acceptance to a database; or pixels from a graphical


image. The acceptation absorbed to a accurate book is bent absolutely by the


data structures and operations acclimated by a program to action the file. It is


believable (and itsometimes happens) that a cartoon book will be apprehend and


displayed by a program advised to action textual data. The aftereffect is that


no allusive achievement occurs (probably) and this is to be expected. A book is


artlessly a apparatus clear accumulator media area programs and data are stored


for apparatus usage.


Essentially there are two kinds of files that programmers accord with argument files


and bifold files . These two classes of files will be discussed in the afterward




ASCII Argument files


A argument book can be a beck of characters that a computer can action sequentially.


It is not alone candy sequentially but alone in advanced direction. For this


cause a argument book is usually opened for alone one affectionate of operation (reading,


writing, or appending) at any accustomed time.


Similarly, back argument files alone action characters, they can alone apprehend or


address data one appearance at a time. (In C Programming Language, Functions are


provided that accord with curve of text, but these still about action data


one appearance at a time.) A argument beck in C is a appropriate affectionate of file. Depending


on the requirements of the operating system, newline characters may be adapted


to or from carriage-return/linefeed combinations depending on whether data is


getting accounting to, or apprehend from, the file. Additional appearance conversions may aswell


action to amuse the accumulator requirements of the operating system. These translations


action clearly and they action because the programmer has signalled the


ambition to action a argument file.


Bifold files


A bifold book is no altered to a argument file. It is a accumulating of bytes.


In C Programming Accent a byte and a appearance are equivalent. Appropriately a bifold


book is aswell referred to as a appearance stream, but there are two capital





  1. No appropriate processing of the data occurs and anniversary byte of data is transferred


    to or from the deejay unprocessed.


  3. C Programming Accent places no constructs on the file, and it may be apprehend


    from, or accounting to, in any address called by the programmer.



Bifold files can be either candy sequentially or, depending on the needs


of the application, they can be candy using accidental admission techniques. In


C Programming Language, processing a book using accidental admission techniques involves


affective the accepted book position to an adapted abode in the book afore


account or autograph data. This indicates a additional appropriate of bifold files


– they a about candy using apprehend and address operations simultaneously.



For example, a database book will be created and candy as a bifold file.


A almanac amend operation will absorb analysis the adapted record, account


the almanac into memory, modifying it in some way, and assuredly autograph the almanac


aback to deejay at its adapted area in the file. These kinds of operations


are accepted to some bifold files, but are rarely begin in applications that action


argument files.



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Forum: Files Handling (Total 21 Messages)


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Article In : Computers & Technology  -  C Language Programming