A3. Real arithmetic

Functions
Function	D1num (I As Long) As Double
	IEEE 754 special numbers (double precision)
Function	IsFinite (X As Double) As Boolean
	Determine if finite value
Function	IsInf (X As Double) As Boolean
	Determine if infinite value
Function	IsNan (X As Double) As Boolean
	Determine if NaN (Not-a-Number) value
Function	IsNormal (X As Double) As Boolean
	Determine if normal number
Function	Signbit (X As Double) As Boolean
	Determine sign of number

Detailed Description

This is the group of A3. Real arithmetic routines.