Pascal Programming Language

Omar ElSabek & Fayez GhazzawiIT Engineering3th year – UNKNOWN Department

programming II

Sets RecordFiles (Text & Binary)Pointers Linked Lists Unit

Course Index :

Files

Binary Files

Files

Two Types Of Files In Pascal:

1- Text Files2- Binary Files

Binary FilesConcepts

human unreadablenot editablefile content has a data typelike array of data on HD

Concepts in Pascal:Sequential (SE)

Introduction to DBMSopen before / close afterread OR writewrite = override

Binary FilesA binary file is a computer file which may contain any type of data, encoded in binary form for computer storage and processing purposes; for example, computer document files containing formatted text. Many binary file formats contain parts that can be interpreted as text; binary files that contain only textual data—without, for example, any formatting information—are called plain text files. In many cases, plain text files are considered to be different from binary files because binary files are made up of more than just plain text. When downloading, a completely functional program without any installer is also often called program binary, or binaries (as opposed to the source code).

from www.wikipedia.com

B-file:Definition and assign:

Defining Binary Files

Binary Files ExampleProgram test;TypeSTD = Record

Fname : string[20]; { 20 Byte}M : integer; { 2 Byte }State : Boolean; { 1 Byte }

End;Var

T,f : file of Std;VSTD : Std;

Writing Binary Files

Assign(f , “C:\STDfile”);Rewrite(f);For I:=1 to 100 doBegin

With VSTD doReadln ( fname , M , state);

Write (f , VSTD );End;Close(f);

Reading Binary Files

Reset( f );While not eof(f) doBegin

Read(f,vstd);With VSTD dowriteln ( fname , M , state);

End;Close( f );

Editing Binary FilesReset( f );Assign (T,’c:\temp’);Rewrite(T);While not eof(f) do Begin

Read (f , Vstd);VSTD := VSTD.M + 10 ;Write(T,VSTD);

End;Close(f);Close(T);

Editing Binary FilesReset( T );Rewrite (f);While not eof(T) doBegin

Read (T , VSTD);Write(f , VSTD);

End;Close (T);Close (f);Rewrite(T); Close(T);

We’re finished

for today !