Manpage of EXP

EXP

Section: Linux Programmer's Manual (3)
Updated: 2016-03-15
Index
 

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(7)):

expf(), expl():

_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
    || /* Since glibc 2.19: */ _DEFAULT_SOURCE
    || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
 

DESCRIPTION

These functions return 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 xis a NaN, a NaN is returned.

If xis positive infinity, positive infinity is returned.

If xis 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(7) for information on how to determine whether an error has occurred when calling these functions.

The following errors can occur:

Range error, overflow
errnois set to ERANGE. An overflow floating-point exception (FE_OVERFLOW) is raised.
Range error, underflow
errnois set to ERANGE. An underflow floating-point exception (FE_UNDERFLOW) is raised.
 

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
exp(), expf(), expl() Thread safetyMT-Safe
 

CONFORMING TO

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

The variant returning doublealso conforms to SVr4, 4.3BSD, C89.  

SEE ALSO

cbrt(3), cexp(3), exp10(3), exp2(3), expm1(3), sqrt(3)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
CONFORMING TO
SEE ALSO

This document was created by man2html, using the manual pages.
Time: 22:27:57 GMT, June 20, 2016