Pascal Programming Language II

1. Pascal Programming Language
Omar ElSabek & Fayez Ghazzawi
IT Engineering
3th year – UNKNOWN Department
programming II

2. Sets
 Record
Files (Text & Binary)
Pointers
 Linked Lists
 Unit
Course Index :

4. TwoTypes Of Files In Pascal:
1-Text Files
2- Binary Files

5. Concepts
human unreadable
not editable
file content has a data type
like array of data
on HD
Concepts in Pascal:
Sequential (SE)
Introduction to DBMS
open before / close after
read OR write
write = override

6. A 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

7. B-file:
Definition and assign:

8. Program test;
Type
STD = Record
Fname : string[20]; { 20 Byte}
M : integer; { 2 Byte }
State : Boolean; { 1 Byte }
End;
Var
T,f : file of Std;
VSTD : Std;

9. Assign(f , “C:STDfile”);
Rewrite(f);
For I:=1 to 100 do
Begin
With VSTD do
Readln ( fname , M , state);
Write (f , VSTD );
End;
Close(f);

10. Reset( f );
While not eof(f) do
Begin
Read(f,vstd);
With VSTD do
writeln ( fname , M , state);
End;
Close( f );

11. Reset( 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);

12. Reset( T );
Rewrite (f);
While not eof(T) do
Begin
Read (T , VSTD);
Write(f , VSTD);
End;
Close (T);
Close (f);
Rewrite(T);
Close(T);