D1num IsFinite IsInf IsNan IsNormal Signbit

D1num() Function D1num ( I As  Long ) IEEE 754 special numbers (double precision) Purpose Returns special numbers in IEEE 754 double precision floating-point arithmetic. Returns Double The value specified by I. (0 will be returned if I is invalid.) Parameters [in] I Specifies the value to be returned. = 1: Positive infinity (+∞) = 2: Negative infinity (-∞) = 3: Not a number (qNaN) (7ff8 0000 0000 0000 in hexadecimal representation) = 4: Not a number (-qNaN) (fff8 0000 0000 0000 in hexadecimal representation)