Date: Tue, 19 Jan 1999 14:00:02 -0500 (EST) From: Stephen L Moshier X-Sender: moshier AT moshier DOT ne DOT mediaone DOT net To: Kbwms AT aol DOT com cc: Robert Hoehne , djgpp-workers AT delorie DOT com Subject: Re: Bug when printing long doubles In-Reply-To: <58ca22ce.36a4c038@aol.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Reply-To: djgpp-workers AT delorie DOT com On Tue, 19 Jan 1999 Kbwms AT aol DOT com wrote: > Are there any words in any of the Standards that provide guidance here? Here is some jailhouse lawyer reading from C9X: 7.19.6.1 The fprintf function ... f,F A double argument representing a (finite) floating- | point number is converted to decimal notation in the style [-]ddd.ddd, where the number of digits after the decimal-point character is equal to the precision specification. If the precision is missing, it is taken as 6; if the precision is zero and the # flag is not specified, no decimal-point character appears. If a decimal-point character appears, at least one digit appears before it. The value is rounded to the appropriate number of digits. A double argument representing an infinity is converted in one of the styles [-]inf or [-]infinity -- which style is implementation-defined. A double argument representing a NaN is converted in one of the styles [-]nan or [-]nan(n-char-sequence) -- which style, and the meaning of any n-char- sequence, is implementation-defined. The F conversion specifier produces INF, INFINITY, or NAN instead of inf, infinity, or nan, respectively.218) e,E ... A double argument representing an infinity or NaN is converted in the style of an f or F conversion specifier. g,G ... A double argument representing an infinity or NaN is converted in the style of an f or F conversion specifier. ____________________ 218When applied to infinite and NaN values, the -, +, and space flag characters have their usual meaning; the # and 0 flag characters have no effect. This footnote appears under para 7.20.1.3, strtod, strotof, strtold: ____________________ 233An implementation may use the n-char-sequence to determine extra information to be represented in the NaN's significand.