| Description |
The PExtended type is a pointer to a Extended value.
Pointer arithmetic, such as Inc, Dec can be used on it, for example to navigate a block of Extended values, as in the example.
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| Related commands |
| Dec |
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Decrement an ordinal variable |
| Extended |
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The floating point type with the highest capacity and precision |
| Inc |
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Increment an ordinal variable |
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| Example code : Store 3 Extended values in memory and navigate through them |
// Full Unit code.
// -----------------------------------------------------------
// You must store this code in a unit called Unit1 with a form
// called Form1 that has an OnCreate event called FormCreate.
unit Unit1;
interface
uses
// The System unit does not need to be defined
Forms, Dialogs;
type
TForm1 = class(TForm)
procedure FormCreate(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm} // Include form definitions
procedure TForm1.FormCreate(Sender: TObject);
var
extPtr : PExtended;
begin
// Allocate storage for three extended variables
GetMem(extPtr, 3 * SizeOf(Extended));
// Fill out these extended variables
extPtr^ := 123.45;
Inc(extPtr);
extPtr^ := 2.9;
Inc(extPtr);
extPtr^ := 87654321;
// Now display these values
Dec(extPtr, 2);
ShowMessageFmt('Value 1 = %f',[extPtr^]);
Inc(extPtr);
ShowMessageFmt('Value 2 = %f',[extPtr^]);
Inc(extPtr);
ShowMessageFmt('Value 3 = %f',[extPtr^]);
end;
end.
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| Hide full unit code |
Value 1 = 123.45
Value 2 = 2.90
Value 3 = 87654321.00
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