exp2 - Man Page

Math library (libm, -lm)

#include <math.h>

double exp2(double x);
float exp2f(float x);
long double exp2l(long double x);

exp2(), exp2f(), exp2l():

    _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).

C11, POSIX.1-2008.

glibc 2.1. C99, POSIX.1-2001.

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

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