exp2f(3) - Linux man page
Name
exp2, exp2f, exp2l - base-2 exponential function
Synopsis
#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
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.