------- Additional Comments From sgk at troutmask dot apl dot washington dot edu 2005-02-11 17:10 ------- Gfortran is a Fortran 95 compiler, and AFAIK gfortran's behavior conforms to the Fortran 95 standard, because it has no allowance for floating point exception. Someday, gfortran may/will support Technical Report ISO/IEC 15580: 1998(E), which will then permit the use of the ieee_arithmetic, ieee_features, and ieee_exceptions intrinsic modules.
If you want to set a NaN in gfortran you can do, program test real nan integer duh equivalence (nan,duh) duh = z'FFC00000' print*, nan end program test The question then becomes "what are going to do with NaN?" I suspect the gfortran's behavior of the numeric rational operation and numeric binary operation may give undefined behavior, which is again permitted by the Fortran 95 standard. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19904
