NAME
exp2, exp2f, exp2l - base-2 exponential function SYNOPSIS
#include
double exp2(double x); float exp2f(float x); long double exp2l(long double x); Link with -lm. Feature Test Macro Requirements for glibc (see featuretestmacros(7)): exp2(), exp2f(), exp2l(): XOPENSOURCE >= 600 || ISOC99SOURCE || POSIXCSOURCE >= 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 matherror(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). ┌─────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├─────────────────────────┼───────────────┼─────────┤
│exp2(), exp2f(), exp2l() │ Thread safety │ MT-Safe │ └─────────────────────────┴───────────────┴─────────┘ 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
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2010-09-20 EXP2(3)