Indicates when a floating-point variable or expression evaluates to zero, or very close to zero.

function IsZero(const A: Extended; Epsilon: Extended = 0): Boolean; overload;
function IsZero(const A: Double; Epsilon: Double = 0): Boolean; overload;
function IsZero(const A: Single; Epsilon: Single = 0): Boolean; overload;

Boolean IsZero(const Extended A, Extended Epsilon = 0);
Boolean IsZero(const Double A, Double Epsilon = 0);
Boolean IsZero(const Single A, Single Epsilon = 0);