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#include <math.h> double exp(double x); |
This function computes the exponential of x, e^x, where e is the base of the natural system of logarithms, approximately 2.718281828.
e to the x power. If the value of x is finite, but so
large in magnitude that its exponential cannot be accurately represented
by a double
, the return value is the nearest representable
double
(possibly, an Inf
), and errno
is set to
ERANGE
. If x is either a positive or a negative infinity,
the result is either +Inf
or zero, respectively, and errno
is not changed. If x is a NaN
, the return value is
NaN
and errno
is set to EDOM
.
ANSI/ISO C | C89; C99 |
POSIX | 1003.2-1992; 1003.1-2001 |