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EXP2(3) Linux Programmer's Manual EXP2(3) 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(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L DESCRIPTION These functions return 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. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ¬ββββββββββββββββ¬ββββββββββ βInterface β Attribute β Value β ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββΌββββββββββββββββΌββββββββββ€ βexp2(), exp2f(), exp2l() β Thread safety β MT-Safe β ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ΄ββββββββββββββββ΄ββββββββββ CONFORMING TO C99, POSIX.1-2001, POSIX.1-2008. The variant returning double also conforms to SVr4, 4.3BSD. SEE ALSO cbrt(3), cexp2(3), exp(3), exp10(3), sqrt(3) 2021-03-22 EXP2(3)