PASCAL - TUTORIAL POINTER

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Definition about Pointer

Pointer in pascal is structured data types that have been provided by the PASCAL to be made as a variable that stores the address of an object (can be variable, constants of type or subprogram).

Pointer is directions to a location data. because the pointer variable not contain data, but the address of the data

Declaration Of Pointer :

Type var_pointer : ^ identifier_tipe ;

Or

Var var_pointer : ^ identifier_tipe;

Example 1 :

Uses crt;

Type

RecordData            = RECORD

name                                : string [20];

id                        : string [15];

END;

PtrData                     = ^ Record_of_Data;

Var

mhs           : PtrData;

PtrInt        : ^Integer;

Begin

Clrscr;

End.

Pointer can also fill out the address of a variable, and the syntax is :

Var_pointer := @var_fill;

Information :

Var_pointer  = Variable pointer.

Var_fill           = Variable whose contents will be designated by the pointer.

Operator @   = This command to generate the address of the designated variable (var_fill), not the content of these var_fill.

To retrieve the contents and syntax of the data pointed to by a pointer variable (var_fill), use this:

Writeln ( var_pointer^ );

Ok this example from pointer program

Example 2 :

Uses crt;

Type

Pointerinteger = ^integer;

Var

Pointervalue : pointerinteger;

value : integer;

Begin

Clrscr;

value := 56;

Writeln ('Fill of variable value = ',value);

Pointervalue  := @value ;

Writeln ('Value of the designated = ', pointervalue^); Readln;

End.

Press ”alt  + F9” >> compile the program.

Press ”ctrl + F9” >> running the program.

NOTE ::

Please change all quotes (“ “) or (‘ ‘), if you using copy and paste…

To result ::

Fill of variable value = 56               

Value of the designated = 56

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