D1num D1num_sub IsFinite IsFinite_sub IsInf IsInf_sub IsNan IsNan_sub IsNormal IsNormal_sub Signbit Signbit_sub

D1num_sub() Sub D1num_sub ( Ret As  Double, I As  Long, Optional Info As  Long  ) IEEE 754 special numbers (double precision) (Subroutine version) Purpose Returns special numbers in IEEE 754 double precision floating-point arithmetic. Parameters [out] Ret The value specified by I. (0 will be returned if I is invalid.) [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) [out] Info (Optional) = 0: Successful exit. = -1: The argument I had an illegal value. (I < 1 or I > 4)