exp2, exp2f, exp2l - base-2 exponential function
These functions return the value of 2 raised to the power of
On success, these functions return the base-2 exponential value of
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, POSIX.1-2008.
The variant returning
double also conforms to SVr4,
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