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32.\" from: @(#)exp.3 6.12 (Berkeley) 7/31/91
33.\" $Id: exp.3,v 1.4 2004/12/20 21:35:45 scp Exp $
34.\"
35.Dd December 11, 2006
36.Dt EXP 3
37.Os BSD 4
38.Sh NAME
39.Nm exp ,
40.Nm exp2 ,
41.Nm expm1
42.Nd exponential functions
43.Sh SYNOPSIS
44.Fd #include <math.h>
45.Ft double
46.Fn exp "double x"
47.Ft long double
48.Fn expl "long double x"
49.Ft float
50.Fn expf "float x"
51.Ft double
52.Fn exp2 "double x"
53.Ft long double
54.Fn exp2l "long double x"
55.Ft float
56.Fn exp2f "float x"
57.Ft double
58.Fn expm1 "double x"
59.Ft long double
60.Fn expm1l "long double x"
61.Ft float
62.Fn expm1f "float x"
63.Sh DESCRIPTION
64The
65.Fn exp
66function computes e**x, the base-e exponential of
67.Fa x .
68.Pp
69The
70.Fn exp2
71function computes 2**x, the base-2 exponential of
72.Fa x .
73.Pp
74The
75.Fn expm1
76function computes the base-e exponential of
77.Fa x
78, minus 1 accurately even for very small values of
79.Fa x .
80.Sh SPECIAL VALUES
81.Fn exp "�0"
82and
83.Fn exp2 "�0"
84return 1.
85.Pp
86.Fn exp "-infinity"
87and
88.Fn exp2 "-infinity"
89return +0.
90.Pp
91.Fn exp "+infinity"
92and
93.Fn exp2 "+infinity"
94return +infinity.
95.Pp
96.Fn expm1 "�0"
97returns �0.
98.Pp
99.Fn expm1 "-infinity"
100returns -1.
101.Pp
102.Fn expm1 "+infinity"
103returns +infinity.
104.Pp
105For all these functions, a range error occurs if the magnitude of x is too large.
106.Sh SEE ALSO
107.Xr math 3
108.Sh STANDARDS
109The
110.Fn exp
111,
112.Fn exp2
113, and
114.Fn expm1
115functions conform to ISO/IEC 9899:1999(E).