Base-2 exponential function
#include <math.h> 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).
These functions first appeared in glibc in version 2.1.
C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.
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