Manpage of EXP
EXPSection: Linux Programmer's Manual (3)
NAMEexp, expf, expl - base-e exponential function
#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)):
- _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
DESCRIPTIONThese functions return the value of e (the base of natural logarithms) raised to the power of x.
RETURN VALUEOn 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.
ERRORSSee 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.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
|exp(), expf(), expl()||Thread safety||MT-Safe|
CONFORMING TOC99, POSIX.1-2001, POSIX.1-2008.
SEE ALSOcbrt(3), cexp(3), exp10(3), exp2(3), expm1(3), sqrt(3)
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