ISNAN(3C-SysV)      RISC/os Reference Manual       ISNAN(3C-SysV)



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
     isnand and isnanf return true (1) 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(3C).































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