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Linux 2.6 - man page for expl (linux section 3)

EXP(3)							     Linux Programmer's Manual							    EXP(3)

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 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(7) for information on how to determine whether an error has occurred when calling these functions. 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.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +----------------------+---------------+---------+ |Interface | Attribute | Value | +----------------------+---------------+---------+ |exp(), expf(), expl() | Thread safety | MT-Safe | +----------------------+---------------+---------+
CONFORMING TO
C99, POSIX.1-2001, POSIX.1-2008. The variant returning double also conforms to SVr4, 4.3BSD, C89.
SEE ALSO
cbrt(3), cexp(3), exp10(3), exp2(3), expm1(3), sqrt(3) 2017-09-15 EXP(3)

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