ISNAN(3C)            INTERACTIVE UNIX System            ISNAN(3C)



          NAME
               isnan: isnand, isnanf - test for floating point NaN (Not-A-
               Number)

          SYNOPSIS
               #include <ieeefp.h>

               int isnand (dsrc)
               double dsrc;

               int isnanf (fsrc)
               float fsrc;

          DESCRIPTION
               The isnand and isnanf functions return true (1) if the argu-
               ment dsrc or fsrc is a NaN; otherwise they return false (0).

               Neither routine generates any exception, even for signaling
               NaNs.

               isnanf() is implemented as a macro included in <ieeefp.h>.

          SEE ALSO
               fpgetround(3C).































          Rev. C Software Development Set                            Page 1