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     ISNAN(S)                  UNIX System V                  ISNAN(S)



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

     Syntax
          #include <ieeefp.h>

          int isnand (dsrc)
          double dsrc;

          int isnanf (fsrc)
          float fsrc;

     Description
          The isnand and isnanf functions return true (C) if the
          argument 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(S)




                                             (printed 6/20/89)