VMS Help  —  CRTL  isnan
    Test for a NaN. Returns 1 if the argument is NaN; 0 if not.

    This function is supported on OpenVMS Integrity servers and
    Alpha only.

    Format

      #include  <math.h>

      int isnan  (double x);

      int isnanf  (float x);

      int isnanl  (long double x);
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