ultrix man page for isnand

isnand(3m)																isnand(3m)

Name
       isnand, isnanf - test for floating point NaN (Not-A-Number)

Syntax
       int isnand (dsrc)
       double dsrc;

       int isnanf (fsrc)
       float fsrc;

Description
       The and routines return the value 1 for true if the argument dsrc or fsrc is a NaN; otherwise they return the value 0 for false.

       Neither routine generates any exception, even for signaling NaNs.

       The function is implemented as a macro included in <ieeefp.h>.

								       RISC								isnand(3m)