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.
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25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30.\" SUCH DAMAGE.
31.\"
32.\" from: @(#)exp.3 6.12 (Berkeley) 7/31/91
33.\" $FreeBSD: head/lib/msun/man/exp.3 57686 2000-03-02 09:14:21Z sheldonh $
34.\"
35.Dd July 31, 1991
36.Dt EXP 3
37.Os BSD 4
38.Sh NAME
39.Nm exp ,
40.Nm expf ,
41.Nm exp2 ,
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259operand on a
260.Tn VAX ) . Previous implementations of pow may
261have defined x**0 to be undefined in some or all of these
262cases. Here are reasons for returning x**0 = 1 always:
263.Bl -enum -width indent
264.It
265Any program that already tests whether x is zero (or
266infinite or \*(Na) before computing x**0 cannot care
267whether 0**0 = 1 or not.
268Any program that depends
269upon 0**0 to be invalid is dubious anyway since that
270expression's meaning and, if invalid, its consequences
271vary from one computer system to another.
272.It
273Some Algebra texts (e.g. Sigler's) define x**0 = 1 for
274all x, including x = 0.
275This is compatible with the convention that accepts a[0]
276as the value of polynomial
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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.
--- 16 unchanged lines hidden (view full) ---
25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30.\" SUCH DAMAGE.
31.\"
32.\" from: @(#)exp.3 6.12 (Berkeley) 7/31/91
33.\" $FreeBSD: head/lib/msun/man/exp.3 57686 2000-03-02 09:14:21Z sheldonh $
34.\"
35.Dd July 31, 1991
36.Dt EXP 3
37.Os BSD 4
38.Sh NAME
39.Nm exp ,
40.Nm expf ,
41.Nm exp2 ,
--- 217 unchanged lines hidden (view full) ---
259operand on a
260.Tn VAX ) . Previous implementations of pow may
261have defined x**0 to be undefined in some or all of these
262cases. Here are reasons for returning x**0 = 1 always:
263.Bl -enum -width indent
264.It
265Any program that already tests whether x is zero (or
266infinite or \*(Na) before computing x**0 cannot care
267whether 0**0 = 1 or not.
268Any program that depends
269upon 0**0 to be invalid is dubious anyway since that
270expression's meaning and, if invalid, its consequences
271vary from one computer system to another.
272.It
273Some Algebra texts (e.g. Sigler's) define x**0 = 1 for
274all x, including x = 0.
275This is compatible with the convention that accepts a[0]
276as the value of polynomial
--- 48 unchanged lines hidden ---