1EXP2(3)                    Linux Programmer's Manual                   EXP2(3)
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NAME

6       exp2, exp2f, exp2l - base-2 exponential function
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SYNOPSIS

9       #include <math.h>
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11       double exp2(double x);
12       float exp2f(float x);
13       long double exp2l(long double x);
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15       Link with -lm.
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17   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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19       exp2(), exp2f(), exp2l():
20           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
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DESCRIPTION

23       These functions return the value of 2 raised to the power of x.
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RETURN VALUE

26       On success, these functions return the base-2 exponential value of x.
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28       For  various special cases, including the handling of infinity and NaN,
29       as well as overflows and underflows, see exp(3).
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ERRORS

32       See math_error(7) for information on how to determine whether an  error
33       has occurred when calling these functions.
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35       For  a discussion of the errors that can occur for these functions, see
36       exp(3).
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VERSIONS

39       These functions first appeared in glibc in version 2.1.
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ATTRIBUTES

42       For  an  explanation  of  the  terms  used   in   this   section,   see
43       attributes(7).
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45       ┌─────────────────────────┬───────────────┬─────────┐
46       │Interface                │ Attribute     │ Value   │
47       ├─────────────────────────┼───────────────┼─────────┤
48       │exp2(), exp2f(), exp2l() │ Thread safety │ MT-Safe │
49       └─────────────────────────┴───────────────┴─────────┘

CONFORMING TO

51       C99, POSIX.1-2001, POSIX.1-2008.
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53       The variant returning double also conforms to SVr4, 4.3BSD.
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SEE ALSO

56       cbrt(3), cexp2(3), exp(3), exp10(3), sqrt(3)
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COLOPHON

59       This  page  is  part of release 4.15 of the Linux man-pages project.  A
60       description of the project, information about reporting bugs,  and  the
61       latest     version     of     this    page,    can    be    found    at
62       https://www.kernel.org/doc/man-pages/.
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66                                  2017-09-15                           EXP2(3)
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