.\"	$OpenBSD: modf.3,v 1.5 2003/06/02 20:18:34 millert Exp $
.\"
.\" Copyright (c) 1991, 1993
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.\" This code is derived from software contributed to Berkeley by
.\" the American National Standards Committee X3, on Information
.\" Processing Systems.
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.Dd June 4, 1993
.Dt MODF 3
.Os
.Sh NAME
.Nm modf
.Nd extract signed integral and fractional values from floating-point number
.Sh SYNOPSIS
.Fd #include <math.h>
.Ft double
.Fn modf "double value" "double *iptr"
.Sh DESCRIPTION
The
.Fn modf
function breaks the argument
.Fa value
into integral and fractional parts, each of which has the
same sign as the argument.
It stores the integral part as a
.Li double
in the object pointed to by
.Fa iptr .
.Sh RETURN VALUES
The
.Fn modf
function returns the signed fractional part of
.Fa value .
.Sh SEE ALSO
.Xr frexp 3 ,
.Xr ldexp 3 ,
.Xr math 3
.Sh STANDARDS
The
.Fn modf
function conforms to
.St -ansiC .