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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "FPCLASSIFY" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" fpclassify 
+.SH NAME
+fpclassify \- classify real floating type
+.SH SYNOPSIS
+.LP
+\fB#include <math.h>
+.br
+.sp
+int fpclassify(real-floating\fP \fIx\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIfpclassify\fP() macro shall classify its argument value as
+NaN, infinite, 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.
+.SH RETURN VALUE
+.LP
+The \fIfpclassify\fP() macro shall return the value of the number
+classification macro appropriate to the value of its
+argument.
+.SH ERRORS
+.LP
+No errors are defined.
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIisfinite\fP() , \fIisinf\fP() , \fIisnan\fP() , \fIisnormal\fP()
+, \fIsignbit\fP() , the
+Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<math.h>\fP
+.SH 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 .