| ilogb.3 (165906) | ilogb.3 (174698) |
|---|---|
| 1.\" Copyright (c) 1985, 1991 Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 12 unchanged lines hidden (view full) --- 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" from: @(#)ieee.3 6.4 (Berkeley) 5/6/91 | 1.\" Copyright (c) 1985, 1991 Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 12 unchanged lines hidden (view full) --- 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" from: @(#)ieee.3 6.4 (Berkeley) 5/6/91 |
| 29.\" $FreeBSD: head/lib/msun/man/ilogb.3 165906 2007-01-09 01:02:06Z imp $ | 29.\" $FreeBSD: head/lib/msun/man/ilogb.3 174698 2007-12-17 03:53:38Z das $ |
| 30.\" | 30.\" |
| 31.Dd November 6, 2005 | 31.Dd December 16, 2007 |
| 32.Dt ILOGB 3 33.Os 34.Sh NAME 35.Nm ilogb , 36.Nm ilogbf , 37.Nm ilogbl , 38.Nm logb , | 32.Dt ILOGB 3 33.Os 34.Sh NAME 35.Nm ilogb , 36.Nm ilogbf , 37.Nm ilogbl , 38.Nm logb , |
| 39.Nm logbf | 39.Nm logbf , 40.Nm logbl |
| 40.Nd extract exponent 41.Sh LIBRARY 42.Lb libm 43.Sh SYNOPSIS 44.In math.h 45.Ft int 46.Fn ilogb "double x" 47.Ft int 48.Fn ilogbf "float x" 49.Ft int 50.Fn ilogbl "long double x" 51.Ft double 52.Fn logb "double x" 53.Ft float 54.Fn logbf "float x" | 41.Nd extract exponent 42.Sh LIBRARY 43.Lb libm 44.Sh SYNOPSIS 45.In math.h 46.Ft int 47.Fn ilogb "double x" 48.Ft int 49.Fn ilogbf "float x" 50.Ft int 51.Fn ilogbl "long double x" 52.Ft double 53.Fn logb "double x" 54.Ft float 55.Fn logbf "float x" |
| 56.Ft long double 57.Fn logbl "long double x" |
|
| 55.Sh DESCRIPTION 56.Fn ilogb , 57.Fn ilogbf 58and 59.Fn ilogbl 60return 61.Fa x Ns 's exponent 62in integer format. 63.Fn ilogb \*(Pm\*(If 64returns 65.Dv INT_MAX , 66.Fn ilogb \*(Pm\*(Na 67returns 68.Dv FP_ILOGBNAN , 69and 70.Fn ilogb 0 71returns 72.Dv FP_ILOGB0 . 73.Pp | 58.Sh DESCRIPTION 59.Fn ilogb , 60.Fn ilogbf 61and 62.Fn ilogbl 63return 64.Fa x Ns 's exponent 65in integer format. 66.Fn ilogb \*(Pm\*(If 67returns 68.Dv INT_MAX , 69.Fn ilogb \*(Pm\*(Na 70returns 71.Dv FP_ILOGBNAN , 72and 73.Fn ilogb 0 74returns 75.Dv FP_ILOGB0 . 76.Pp |
| 74.Fn logb x | 77.Fn logb x , 78.Fn logbf x , |
| 75and | 79and |
| 76.Fn logbf x | 80.Fn logbl x |
| 77return 78.Fa x Ns 's exponent 79in floating\-point format with the same precision as 80.Fa x . 81.Fn logb \*(Pm\*(If 82returns +\*(If, and 83.Fn logb 0 84returns -\*(If with a division by zero exception. 85.Sh SEE ALSO 86.Xr frexp 3 , 87.Xr ieee 3 , 88.Xr math 3 , 89.Xr scalbn 3 90.Sh STANDARDS 91The 92.Fn ilogb , 93.Fn ilogbf , 94.Fn ilogbl , | 81return 82.Fa x Ns 's exponent 83in floating\-point format with the same precision as 84.Fa x . 85.Fn logb \*(Pm\*(If 86returns +\*(If, and 87.Fn logb 0 88returns -\*(If with a division by zero exception. 89.Sh SEE ALSO 90.Xr frexp 3 , 91.Xr ieee 3 , 92.Xr math 3 , 93.Xr scalbn 3 94.Sh STANDARDS 95The 96.Fn ilogb , 97.Fn ilogbf , 98.Fn ilogbl , |
| 95.Fn logb | 99.Fn logb , 100.Fn logbf , |
| 96and | 101and |
| 97.Fn logbf | 102.Fn logbl |
| 98routines conform to 99.St -isoC-99 . | 103routines conform to 104.St -isoC-99 . |
| 100.Fn logb 101and 102.Fn logbf | 105The latter three |
| 103implement the logb function recommended by 104.St -ieee754 . 105.Sh HISTORY | 106implement the logb function recommended by 107.St -ieee754 . 108.Sh HISTORY |
| 106The 107.Fn logb 108function appeared in 109.Bx 4.3 . 110The 111.Fn ilogb 112function appeared in 113.Fx 1.1.5 . 114The 115.Fn ilogbf 116and 117.Fn logbf 118functions appeared in 119.Fx 2.0 . 120The 121.Fn ilogbl 122function appeared in 123.Fx 5.4 . | 109.Bl -tag -width "Function " -compact 110.It Em Function 111.Em "First Appeared In" 112.It Fn logb 113.Bx 4.3 114.It Fn ilogb 115.Fx 1.1.5 116.It Fn ilogbf 117.Fx 2.0 118.It Fn logbf 119.Fx 2.0 120.It Fn ilogbl 121.Fx 5.4 122.It Fn logbl 123.Fx 8.0 124.El |