exp

Syntax

#include <math.h> double exp(double x);

Description

This function computes the exponential of x, e^x, where e is the base of the natural system of logarithms, approximately 2.718281828.

Return Value

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.

Portability

ANSI/ISO C	C89; C99
POSIX	1003.2-1992; 1003.1-2001