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exp2, 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)): exp2(), exp2f(), exp2l(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc -std=c99
The exp2() function returns the value of 2 raised to the power of x.
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).
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).
These functions first appeared in glibc in version 2.1.
C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.
This page is part of release 3.35 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://man7.org/linux/man- pages/. 2010-09-20 EXP2(3)