Интерактивная система просмотра системных руководств (man-ов) expl (3) expl ( Русские man: Библиотечные вызовы ) >> expl ( Linux man: Библиотечные вызовы ) expl ( POSIX man: Библиотечные вызовы )
NAME
exp, expf, expl - base-e exponential function
SYNOPSIS
#include <math.h >
double exp(double x );
float expf(float x );
long double expl(long double x );
Link with -lm .
Feature Test Macro Requirements for glibc (see
feature_test_macros
expf (),
expl ():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or
cc -std=c99
DESCRIPTION
The
exp ()
function returns the value of e (the base of natural
logarithms) raised to the power of x .
RETURN VALUE
On success, these functions return the exponential value of
x .
If
x
is a NaN,
a NaN is returned.
If
x
is positive infinity,
positive infinity is returned.
If
x
is negative infinity,
+0 is returned.
If the result underflows,
a range error occurs,
and zero is returned.
If the result overflows,
a range error occurs,
and the functions return
+HUGE_VAL ,
+HUGE_VALF ,
or
+HUGE_VALL ,
respectively.
ERRORS
See
math_error
The following errors can occur:
Range error, overflow
errno
is set to
ERANGE .
An overflow floating-point exception
(FE_OVERFLOW )
is raised.
Range error, underflow
errno
is set to
ERANGE .
An underflow floating-point exception
(FE_UNDERFLOW )
is raised.
CONFORMING TO
C99, POSIX.1-2001.
The variant returning
double
also conforms to
SVr4, 4.3BSD, C89.
SEE ALSO
cbrt cexp exp10 exp2 sqrt
COLOPHON
This page is part of release 3.14 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/.
Index
NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
SEE ALSO
COLOPHON
