1exp2(3) Library Functions Manual exp2(3)
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6 exp2, exp2f, exp2l - base-2 exponential function
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9 Math library (libm, -lm)
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12 #include <math.h>
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14 double exp2(double x);
15 float exp2f(float x);
16 long double exp2l(long double x);
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18 Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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20 exp2(), exp2f(), exp2l():
21 _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
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24 These functions return the value of 2 raised to the power of x.
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27 On success, these functions return the base-2 exponential value of x.
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29 For various special cases, including the handling of infinity and NaN,
30 as well as overflows and underflows, see exp(3).
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33 See math_error(7) for information on how to determine whether an error
34 has occurred when calling these functions.
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36 For a discussion of the errors that can occur for these functions, see
37 exp(3).
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40 For an explanation of the terms used in this section, see at‐
41 tributes(7).
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43 ┌────────────────────────────────────────────┬───────────────┬─────────┐
44 │Interface │ Attribute │ Value │
45 ├────────────────────────────────────────────┼───────────────┼─────────┤
46 │exp2(), exp2f(), exp2l() │ Thread safety │ MT-Safe │
47 └────────────────────────────────────────────┴───────────────┴─────────┘
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50 C11, POSIX.1-2008.
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53 glibc 2.1. C99, POSIX.1-2001.
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55 The variant returning double also conforms to SVr4, 4.3BSD.
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58 cbrt(3), cexp2(3), exp(3), exp10(3), sqrt(3)
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62Linux man-pages 6.04 2023-03-30 exp2(3)