NAME

exp2, exp2f, exp2l - base-2 exponential function

LIBRARY

Math library (libm, -lm)

#include <math.h>
double exp2(double x);
float exp2f(float x);
long double exp2l(long double x);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

These functions return 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).

For an explanation of the terms used in this section, see attributes(7).

Interface	Attribute	Value
exp2(), exp2f(), exp2l()	Thread safety	MT-Safe

C11, POSIX.1-2008.

glibc 2.1. C99, POSIX.1-2001.

The variant returning double also conforms to SVr4, 4.3BSD.