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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "MODF" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" modf 
+.SH NAME
+modf, modff, modfl \- decompose a floating-point number
+.SH SYNOPSIS
+.LP
+\fB#include <math.h>
+.br
+.sp
+double modf(double\fP \fIx\fP\fB, double *\fP\fIiptr\fP\fB);
+.br
+float modff(float\fP \fIvalue\fP\fB, float *\fP\fIiptr\fP\fB);
+.br
+long double modfl(long double\fP \fIvalue\fP\fB, long double *\fP\fIiptr\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+These functions shall break the argument \fIx\fP into integral and
+fractional parts, each of which has the same sign as the
+argument. It stores the integral part as a \fBdouble\fP (for the \fImodf\fP()
+function), a \fBfloat\fP (for the \fImodff\fP()
+function), or a \fBlong double\fP (for the \fImodfl\fP() function),
+in the object pointed to by \fIiptr\fP.
+.SH RETURN VALUE
+.LP
+Upon successful completion, these functions shall return the signed
+fractional part of \fIx\fP.
+.LP
+If
+\fIx\fP is NaN, a NaN shall be returned, and *\fIiptr\fP shall be
+set to a NaN.
+.LP
+If \fIx\fP is \(+-Inf, \(+-0 shall be returned, and *\fIiptr\fP shall
+be set to \(+-Inf. 
+.SH ERRORS
+.LP
+No errors are defined.
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+The \fImodf\fP() function computes the function result and *\fIiptr\fP
+such that:
+.sp
+.RS
+.nf
+
+\fBa = modf(x, iptr) ;
+x == a+*iptr ;
+\fP
+.fi
+.RE
+.LP
+allowing for the usual floating-point inaccuracies.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIfrexp\fP() , \fIisnan\fP() , \fIldexp\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 .