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1.17 exp2, exp2f—exponential, base 2

Synopsis 

     #include <math.h>
     double exp2(double x);
     float exp2f(float x);

Description
exp2 and exp2f calculate 2 ^ x, that is, 2 raised to the power x.

You can use the (non-ANSI) function matherr to specify error handling for these functions.
Returns
On success, exp2 and exp2f return the calculated value. If the result underflows, the returned value is 0. If the result overflows, the returned value is HUGE_VAL. In either case, errno is set to ERANGE.
Portability
ANSI C, POSIX.