# exp(3) - NetBSD Manual Pages

Command: Section: Arch: Collection:
```EXP(3)                  NetBSD Library Functions Manual                 EXP(3)

NAME
exp, expf, exp2, exp2f, expm1, expm1f -- exponential functions

LIBRARY
Math Library (libm, -lm)

SYNOPSIS
#include <math.h>

double
exp(double x);

float
expf(float x);

double
exp2(double x);

float
exp2f(float x);

double
expm1(double x);

float
expm1f(float x);

DESCRIPTION
The exp() and expf() functions compute the base e exponential value of
the given argument x.

The exp2() and exp2f() functions compute the base 2 exponential of the
given argument x.

The expm1() and expm1f() functions compute the value exp(x)-1 accurately
even for tiny argument x.

RETURN VALUES
These functions will return the appropriate computation unless an error
occurs or an argument is out of range.  The functions exp() and expm1()
detect if the computed value will overflow, set the global variable errno
to ERANGE and cause a reserved operand fault on a VAX.

math(3)

STANDARDS
The exp() function conforms to ANSI X3.159-1989 (``ANSI C89'').  The
exp2(), exp2f(), expf(), expm1(), and expm1f() functions conform to
ISO/IEC 9899:1999 (``ISO C99'').

HISTORY
The exp() functions appeared in Version 1 AT&T UNIX.  The expm1() func-
tion appeared in 4.3BSD.

NetBSD 9.3                     September 2, 2019                    NetBSD 9.3
```
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