Manpages - exp2.3

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*():

      _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).

These functions first appeared in glibc in version 2.1.

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

C99, POSIX.1-2001, POSIX.1-2008.

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

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

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