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.\" from: @(#)ieee.3 6.4 (Berkeley) 5/6/91
.\" $Id: nextafter.3,v 1.4 2004/12/20 21:35:46 scp Exp $
.\"
.Dd December 11, 2006
.Dt NEXTAFTER 3
.Os
.Sh NAME
.Nm nextafter
.Sh SYNOPSIS
.Fd #include
.Ft double
.Fn nextafter "double x" "double y"
.Ft long double
.Fn nextafterl "long double x" "long double y"
.Ft float
.Fn nextafterf "float x" "float y"
.Sh DESCRIPTION
The
.Fn nextafter
functions return the next machine representable number from
.Fa x
in direction
.Fa y .
.Sh SPECIAL VALUES
.Fn nextafter "x" "y"
raises the "overflow" and "inexact" floating-point exceptions for x finite and the function value infinite.
.Pp
.Fn nextafter "x" "y"
raises the "underflow" and "inexact" floating-point exceptions for the function value subnormal or zero and x not equal to y.
.Sh SEE ALSO
.Xr math 3
.Sh STANDARDS
The
.Fn nextafter
functions conform to ISO/IEC 9899:1999(E).