EXPM1

Section: Linux Programmer's Manual (3)
Updated: 2002-07-27
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NAME

expm1, expm1f, expm1l - exponential minus 1

SYNOPSIS

#include <math.h>

double expm1(double x);


float expm1f(float x);


long double expm1l(long double x);

Link with -lm.

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.

CONFORMING TO

BSD, C99. The float and the long double variants are C99 requirements.