EXP(3) BSD Library Functions Manual EXP(3)
NAME
exp, exp2, expm1 -- exponential functions
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() function computes e**x, the base-e exponential of x.
The exp2() function computes 2**x, the base-2 exponential of x.
The expm1() function computes the base-e exponential of x , minus 1 accurately even for very small values of x.
SPECIAL VALUES
exp(+-0) and exp2(+-0) return 1.
exp(-infinity) and exp2(-infinity) return +0.
exp(+infinity) and exp2(+infinity) return +infinity.
expm1(+-0) returns +-0.
expm1(-infinity) returns -1.
expm1(+infinity) returns +infinity.
For all these functions, a range error occurs if the magnitude of x is too large.
SEE ALSO
math(3), infnan(3)
STANDARDS
The exp() , expf() , exp2() , exp2f() , expm1() , and expm1f() functions conform to ISO/IEC 9899:1999(E).
4th Berkeley Distribution January 30, 2003 4th Berkeley Distribution
