System.TFloatSpecial
Delphi
TFloatSpecial = ( fsZero, fsNZero, fsDenormal, fsNDenormal,
fsPositive, fsNegative, fsInf, fsNInf, fsNaN );
C++
enum DECLSPEC_DENUM TFloatSpecial : unsigned char { fsZero, fsNZero, fsDenormal, fsNDenormal, fsPositive, fsNegative, fsInf, fsNInf, fsNaN };
Contents
Properties
Type | Visibility | Source | Unit | Parent |
---|---|---|---|---|
enum | public | System.pas System.hpp |
System | System |
Description
Represents special floating-point values.
TFloatSpecial is used to designate special categories of floating-point values. The following table describes the classification:
Constant | Description |
---|---|
fsZero | Positive zero (+0.0) |
fsNZero | Negative zero (-0.0) |
fsDenormal | Positive denormalized value |
fsNDenormal | Negative denormalized value |
fsPositive | Positive value |
fsNegative | Negative value |
fsInf | Positive infinite |
fsNInf | Negative infinite |
fsNaN | Not a number (unrepresentable value) |
Note: A denormalized floating-point value is in essence a very approximate value. A denormalized floating-point value obtained by computation indicates a considerable loss of accuracy.
Example
var
F: TSingleRec;
C: TFloatSpecial;
begin
F := TSingleRec(-0.0);
C := F.SpecialType; // C is fsNZero
F := TSingleRec(5e-40);
C := F.SpecialType; // C is fsDenormal
// ...
See Also
- The SpecialType methods provided by the TSingleHelper, TDoubleHelper, TExtendedHelper record helpers
- _fpclass, _fpclassl