|EXP2(3)||Linux Programmer's Manual||EXP2(3)|
NAME¶exp2, exp2f, exp2l - base-2 exponential function
#include <math.h> double exp2(double x);Link with -lm.float exp2f(float x);long double exp2l(long double x);
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
DESCRIPTION¶The exp2() function returns the value of 2 raised to the power of x.
RETURN VALUE¶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).
ERRORS¶See 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).
VERSIONS¶These functions first appeared in glibc in version 2.1.
CONFORMING TO¶C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.
SEE ALSO¶cbrt(3), cexp2(3), exp(3), exp10(3), sqrt(3)
COLOPHON¶This page is part of release 3.74 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.