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EXP(3) - man page online | library functions

Base-e exponential function.

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2015-04-19
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(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc -std=c99
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), sqrt(3)
COLOPHON This page is part of release 4.04 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.
2015-04-19 EXP(3)
This manual Reference Other manuals
exp(3) referred by erf(3) | erfc(3) | exp10(3) | exp2(3) | expm1(3) | log1p(3) | PDL::GSLSF::EXP(3pm)
refer to attributes(7) | cbrt(3) | cexp(3) | exp10(3) | exp2(3) | feature_test_macros(7) | math_error(7) | sqrt(3)