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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.

See Also

cbrt(3) , cexp2(3) , exp(3) , exp10(3) , sqrt(3)

Colophon

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