isnanf(3C)




NAME

     isnan, isnand, isnanf, finite, fpclass, unordered  -  deter-
     mine type of floating-point number


SYNOPSIS

     #include <ieeefp.h>

     int isnand(double dsrc);

     int isnanf(float fsrc);

     int finite(double dsrc);

     fpclass_t fpclass(double dsrc);

     int unordered(double dsrc1, double dsrc2);

     #include <math.h>

     int isnan(double dsrc);


DESCRIPTION

     The isnan() function is identical to the isnand() function.

     The isnanf() function is implemented as a macro included  in
     the <ieeefp.h> header.

     The fpclass() function returns one of the following  classes
     to which dsrc belongs:

     FP_SNAN
           signaling NaN

     FP_QNAN
           quiet NaN

     FP_NINF
           negative infinity

     FP_PINF
           positive infinity

     FP_NDENORM
           negative denormalized non-zero

     FP_PDENORM
           positive denormalized non-zero

     FP_NZERO
           negative zero

     FP_PZERO
           positive zero

     FP_NNORM
           negative normalized non-zero

     FP_PNORM
           positive normalized non-zero

     None of these routines generates an exception, even for sig-
     naling NaNs.


RETURN VALUES

     The isnan(), isnand(), and isnanf() function return TRUE (1)
     if  the  argument  dsrc  or  fsrc  is a NaN;  otherwise they
     return FALSE (0).

     The finite() function returns TRUE (1) if the argument  dsrc
     is  neither  infinity  nor  NaN; otherwise it returns  FALSE
     (0).

     The unordered() function returns TRUE (1) if one of its  two
     arguments is unordered with respect to the other argument.
      This is equivalent to reporting whether either argument  is
     NaN.  If neither argument is NaN, FALSE (0) is returned.


ATTRIBUTES

     See attributes(5) for descriptions of the  following  attri-
     butes:

     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | MT-Level                    | MT-Safe                     |
    |_____________________________|_____________________________|


SEE ALSO

     fpgetround(3C), attributes(5)


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