isinf(3p) - phpMan

ISINF(P)                                                              ISINF(P)



NAME
       isinf - test for infinity

SYNOPSIS
       #include <math.h>

       int isinf(real-floating x);


DESCRIPTION
       The  isinf() macro shall determine whether its argument value is an infinity (posi-
       tive or negative). First, an argument represented in a format wider than its seman-
       tic type is converted to its semantic type. Then determination is based on the type
       of the argument.

RETURN VALUE
       The isinf() macro shall return a non-zero value if and only if its argument has  an
       infinite 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() , 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 Technology -- 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 .



POSIX                                2003                             ISINF(P)

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