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libc.a reference
pow2
Syntax
 #include <math.h>
double pow2(double x);

Description
This function computes 2 to the power of x, 2^x.
Return Value
2 to the x power. If the value of x is finite, but so large
in magnitude that 2^x cannot be accurately represented by a
double
, the return value is the nearest representable
double
(possibly, an Inf
), and errno
is set to
ERANGE
. If x is either a positive or a negative infinity,
the result is either +Inf
or zero, respectively, and errno
is not changed. If x is a NaN
, the return value is
NaN
and errno
is set to EDOM
.
Portability