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29.\" from: @(#)rint.3 5.1 (Berkeley) 5/2/91
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31.Dd $Mdocdate: June 7 2025 $
32.Dt RINT 3
33.Os
34.Sh NAME
35.Nm nearbyint ,
36.Nm nearbyintf ,
37.Nm nearbyintl ,
38.Nm rint ,
39.Nm rintf ,
40.Nm rintl
41.Nd round to integral value in floating-point format
42.Sh SYNOPSIS
43.Lb libm
44.In math.h
45.Ft double
46.Fn nearbyint "double x"
47.Ft float
48.Fn nearbyintf "float x"
49.Ft long double
50.Fn nearbyintl "long double x"
51.Ft double
52.Fn rint "double x"
53.Ft float
54.Fn rintf "float x"
55.Ft long double
56.Fn rintl "long double x"
57.Sh DESCRIPTION
58The
59.Fn rint ,
60.Fn rintf ,
61and
62.Fn rintl
63functions return the integral value nearest to
64.Fa x
65according to the prevailing rounding mode.
66.Pp
67The
68.Fn nearbyint ,
69.Fn nearbyintf ,
70and
71.Fn nearbyintl
72functions do the same,
73but without raising the
74.Dq inexact
75floating-point exception.
76.Sh SEE ALSO
77.Xr abs 3 ,
78.Xr ceil 3 ,
79.Xr fabs 3 ,
80.Xr floor 3
81.Sh HISTORY
82A
83.Fn rint
84function appeared in
85.At v6 .