double exp2(double x);
float exp2f(float x);
long double exp2l(long double x);
Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
exp2(), exp2f(), exp2l():
_XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
or cc -std=c99
The exp2() function returns the value of 2 raised to the power of x.
On success, these functions return the base-2 exponential value of x.
For various special cases, including the handling of infinity and NaN,
as well as overflows and underflows, see exp(3).
See math_error(7) for information on how to determine whether an error
has occurred when calling these functions.
For a discussion of the errors that can occur for these functions, see
These functions first appeared in glibc in version 2.1.
C99, POSIX.1-2001. The variant returning double also conforms to SVr4,
cbrt(3), cexp2(3), exp(3), exp10(3), sqrt(3)
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