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32.\" from: @(#)ieee.3 6.4 (Berkeley) 5/6/91
33.\" $Id: nextafter.3,v 1.4 2004/12/20 21:35:46 scp Exp $
34.\"
35.Dd December 11, 2006
36.Dt NEXTAFTER 3
37.Os
38.Sh NAME
39.Nm nextafter
40.Sh SYNOPSIS
41.Fd #include <math.h>
42.Ft double
43.Fn nextafter "double x" "double y"
44.Ft long double
45.Fn nextafterl "long double x" "long double y"
46.Ft float
47.Fn nextafterf "float x" "float y"
48.Sh DESCRIPTION
49The
50.Fn nextafter
51functions return the next machine representable number from
52.Fa x
53in direction
54.Fa y .
55.Sh SPECIAL VALUES
56.Fn nextafter "x" "y"
57raises the "overflow" and "inexact" floating-point exceptions for x finite and the function value infinite.
58.Pp
59.Fn nextafter "x" "y"
60raises the "underflow" and "inexact" floating-point exceptions for the function value subnormal or zero and x not equal to y.
61.Sh SEE ALSO
62.Xr math 3
63.Sh STANDARDS
64The
65.Fn nextafter
66functions conform to ISO/IEC 9899:1999(E).