Small follow up.
On 04/20/2012 11:18 AM, Tobias Burnus wrote:
Testing other compilers, the result is:
- 'q' not supported: g95, NAG f95, PGI, PathScale, Crayftn
- 'q' supported: g77, ifort, sunf95
It seems to be also supported by IBM's xlf - at least it supports such
literals in the source code. (Cf. [1].)
Before Fortran 90, using "q" was to only way to write quad precision
literals in the source code. For I/O, it does not matter. However, some
compilers wrote "d" for double precision - newer compilers prefer "e"
and accept both "e" and "d" as input, in line with the standard. It is
unclear whether some compilers also wrote "q" for the output or whether
just users did/do so - either because they are used to it, or under the
(always or only nowadays?) wrong perception that it matters.
Tobias
[1]
http://publib.boulder.ibm.com/infocenter/lnxpcomp/v9v111/index.jsp?topic=/com.ibm.xlf111.linux.doc/xlflr/realdatatype.htm
