J3/05-109 Date: 4 Jan 2005 To: J3 From: Fred Tydeman Subject: inf/0.0, NaN/0.0 NUMBER: F03/0030 TITLE: IEEE divide by zero KEYWORDS: IEEE-754, divide-by-zero DEFECT TYPE: Erratum ??? STATUS: For consideration QUESTION: Is infinity / 0.0 a divide by zero exception? Is NaN / 0.0 a divide by zero exception? DISCUSSION: Fortran 2003 defines (in 14.2) infinity / zero and NaN / zero cases as IEEE_DIVIDE_BY_ZERO. IEEE-754 defines (in 6.1 and 6.2) those two as unexceptional. ANSWER: EDITS: All edits refer to 04-007.pdf. [365:18] Change "nonzero numerator" to "finite nonzero numerator". SUBMITTED BY: Fred Tydeman HISTORY: J3/05-109 m171 Submitted