FPCLASSIFY(3P) POSIX Programmer s Manual FPCLASSIFY(3P)
PROLOG This manual page is part of the POSIX Programmer s Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
NAME fpclassify - classify real floating type
SYNOPSIS #include <math.h>
int fpclassify(real-floating x);
DESCRIPTION The fpclassify() macro shall classify its argument value as NaN, infi- nite, normal, subnormal, zero, or into another implementation-defined category. First, an argument represented in a format wider than its semantic type is converted to its semantic type. Then classification is based on the type of the argument.
RETURN VALUE The fpclassify() macro shall return the value of the number classifica- tion macro appropriate to the value of its argument.
ERRORS No errors are defined.
The following sections are informative.
APPLICATION USAGE None.
FUTURE DIRECTIONS None.
SEE ALSO isfinite(), isinf(), isnan(), isnormal(), signbit(), the Base Defini- tions 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 .
IEEE/The Open Group 2003 FPCLASSIFY(3P)