System.Math.IsNan

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Object Pascal

function IsNan(const AValue: Single): Boolean;
function IsNan(const AValue: Double): Boolean;
function IsNan(const AValue: Extended): Boolean;

C++

extern DELPHI_PACKAGE bool __fastcall IsNan(const float AValue)/* overload */;

Properties

Type Visibility Source Unit Parent
function public
System.Math.pas
System.Math.hpp
System.Math System.Math

Description

Indicates when a variable or expression does not evaluate to a numeric value.

Use IsNan to test whether the value specified by AValue represents NaN (not a number). Note that NaN is distinct from positive and negative infinity, which can be detected using the IsInfinite function.

See Also