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man:expf

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).
     allbox; lbw21 lb lb l l l.  Interface Attribute Value T{ exp(), expf(),
     expl() T}   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)

COLOPHON

     This page is part of release 4.16 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
     https://www.kernel.org/doc/man-pages/.
                                2017-09-15                            EXP(3)
/data/webs/external/dokuwiki/data/pages/man/expf.txt · Last modified: 2019/05/17 09:47 by 127.0.0.1

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