isnan(3p) [centos man page]

ISNAN(3P)						     POSIX Programmer's Manual							 ISNAN(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       isnan - test for a NaN

SYNOPSIS

       #include <math.h>

       int isnan(real-floating x);

DESCRIPTION

       The isnan() macro shall determine whether its argument value is a NaN. First, an argument represented in a format wider than  its  semantic
       type is converted to its semantic type. Then determination is based on the type of the argument.

RETURN VALUE

       The isnan() macro shall return a non-zero value if and only if its argument has a NaN value.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       fpclassify(), isfinite(), isinf(), isnormal(), signbit(), the Base Definitions volume of IEEE Std 1003.1-2001, <math.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
       and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can  be  obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003								 ISNAN(3P)

ISFINITE(3P)						     POSIX Programmer's Manual						      ISFINITE(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       isfinite - test for finite value

SYNOPSIS

       #include <math.h>

       int isfinite(real-floating x);

DESCRIPTION

       The isfinite() macro shall determine whether its argument has a finite value (zero, subnormal, or normal, and not infinite or NaN).  First,
       an argument represented in a format wider than its semantic type is converted to its semantic type. Then determination is based on the type
       of the argument.

RETURN VALUE

       The isfinite() macro shall return a non-zero value if and only if its argument has a finite value.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       fpclassify(), isinf(), isnan(), isnormal(), signbit(), the Base Definitions volume of IEEE Std 1003.1-2001 <math.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and  the  original  IEEE
       and  The  Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003							      ISFINITE(3P)