| Description |
The Single type is the fastest floating point type in Delphi. It also has the lowest storage requirements - 32 bits (1 for the sign 8 for the exponent, and 23 for the mantissa).
It supports approximately 7 digits of precision in a range from 1.18 x 10-38 to 3.4 x 1038.
|
|
| Notes |
The Double type is the general purpose floating point type, being higher in capacity and precision than the Single. It takes more storage and is slower however.
The Extended type has the highest capacity and precision, but biggest storage and worst performance.
A Single set to its highest value is treated as Infinity.
|
|
| Related commands |
| Currency |
|
A floating point type with 4 decimals used for financial values |
| Double |
|
A floating point type supporting about 15 digits of precision |
| Extended |
|
The floating point type with the highest capacity and precision |
|
|
|
|
| Example code : Showing the precision and capacity of Single values |
// 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
SysUtils,
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
account1, account2, account3, account4 : Single;
begin
account1 := 0.1234567890123456789; // 20 decimal places
account2 := 1.18E-38; // Lowest exponent value
account3 := 3.4E38; // Highest exponent value
account4 := 3.49E38; // Treated as infinite
ShowMessage('Account1 = '+FloatToStr(account1));
ShowMessage('Account2 = '+FloatToStr(account2));
ShowMessage('Account3 = '+FloatToStr(account3));
ShowMessage('Account4 = '+FloatToStr(account4));
end;
end.
|
| Hide full unit code |
Account1 = 0.123456791043282
Account2 = 1.17999994577463E-38
Account3 = 3.39999995214436E38
Account4 = INF
|
|