EXP2Section: Linux Programmer's Manual (3)
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NAMEexp2, exp2f, exp2l - 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)):
DESCRIPTIONThe exp2() function returns the value of 2 raised to the power of x.
RETURN VALUEOn 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).
ERRORSSee 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 exp(3).
VERSIONSThese functions first appeared in glibc in version 2.1.
CONFORMING TOC99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.
SEE ALSOcbrt(3), cexp2(3), exp(3), exp10(3), sqrt(3)
COLOPHONThis page is part of release 3.21 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.