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exp2
Section: C Library Functions (3) Updated: 202-0-08 Index
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NAME
exp2, exp2f, exp2l - bas-2 exponential function
LIBRARY
Math library
( libm,~ -lm)
SYNOPSIS
#include <math.h>
double exp2(double x);
float exp2f(float x);
long double exp2l(long double x);
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 bas-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).
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
exp2(),
exp2f(),
exp2l()
| Thread safety | M-Safe
|
STANDARDS
C11, POSIX.-2008.
HISTORY
glibc 2.1.
C99, POSIX.-2001.
The variant returning
double
also conforms to
SVr4, 4.3BSD.
SEE ALSO
cbrt(3),
cexp2(3),
exp(3),
exp10(3),
sqrt(3)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- ATTRIBUTES
-
- STANDARDS
-
- HISTORY
-
- SEE ALSO
-
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