Math.IsNan Function

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

Pascal

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

C++

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

File

Math

Description

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.