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expm1, expm1f---exponential minus 1

Synopsis 
#include <math.h>
double expm1(double x);
float expm1f(float x);
Description
expm1 and expm1f calculate the exponential of x and subtract 1, that is, is the base of the natural system of logarithms, approximately 2.71828). The result is accurate even for small values of x, where using exp(x)-1 would lose many significant digits.


Returns
e raised to the power x, minus 1.


Portability
Neither expm1 nor expm1f is required by ANSI C or by the System V Interface Definition (Issue 2).


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