## NAME

expm1, log1p - exponential minus 1, logarithm of 1 plus
argument

## SYNOPSIS

**#include** **<math.h>**
**double** **expm1** **(** **double** **x** **);**
**double** **log1p** **(** **double** **x** **);**

## DESCRIPTION

**expm1(x)** returns a value equivalent to `exp (**x**) - 1'. It is
computed in a way that is accurate even if the value of **x** is
near zero--a case where `exp (**x**) - 1' would be inaccurate
due to subtraction of two numbers that are nearly equal.
**log1p(x)** returns a value equivalent to `log (1 + **x**)'. It is
computed in a way that is accurate even if the value of **x** is
near zero.

## CONFORMING TO

BSD

## SEE ALSO

**exp**(3), **log**(3)