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+'\" t
+.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.\" References consulted:
+.\"     Linux libc source code
+.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
+.\"     386BSD man pages
+.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
+.\" Modified 2002-07-27 by Walter Harms
+.\" 	(walter.harms@informatik.uni-oldenburg.de)
+.\"
+.TH modf 3 (date) "Linux man-pages (unreleased)"
+.SH NAME
+modf, modff, modfl \- extract signed integral and fractional values from
+floating-point number
+.SH LIBRARY
+Math library
+.RI ( libm ", " \-lm )
+.SH SYNOPSIS
+.nf
+.B #include <math.h>
+.P
+.BI "double modf(double " x ", double *" iptr );
+.BI "float modff(float " x ", float *" iptr );
+.BI "long double modfl(long double " x ", long double *" iptr );
+.fi
+.P
+.RS -4
+Feature Test Macro Requirements for glibc (see
+.BR feature_test_macros (7)):
+.RE
+.P
+.BR modff (),
+.BR modfl ():
+.nf
+    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
+        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
+        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
+.fi
+.SH DESCRIPTION
+These functions break the argument
+.I x
+into an integral
+part and a fractional part, each of which has the same sign as
+.IR x .
+The integral part is stored in the location pointed to by
+.IR iptr .
+.SH RETURN VALUE
+These functions return the fractional part of
+.IR x .
+.P
+If
+.I x
+is a NaN, a NaN is returned, and
+.I *iptr
+is set to a NaN.
+.P
+If
+.I x
+is positive infinity (negative infinity), +0 (\-0) is returned, and
+.I *iptr
+is set to positive infinity (negative infinity).
+.SH ERRORS
+No errors occur.
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR modf (),
+.BR modff (),
+.BR modfl ()
+T}	Thread safety	MT-Safe
+.TE
+.SH STANDARDS
+C11, POSIX.1-2008.
+.SH HISTORY
+C99, POSIX.1-2001.
+.P
+The variant returning
+.I double
+also conforms to
+SVr4, 4.3BSD, C89.
+.SH SEE ALSO
+.BR frexp (3),
+.BR ldexp (3)