EXP 3M "8 May 1985"
C 4 NAME
exp, log, log10, pow - exponential, logarithm, power
SYNOPSIS
#include <math.h>double E(x) double x;
double L(x) double x;
double exp(x) double x;
double log(x) double x;
double log10(x) double x;
double pow(x, y) double x, y;
DESCRIPTION
E returns
exp(x)-1 accurately (even if
x is close to 0).
L returns log(1+x) accurately (even if x is close to 0).
Exp returns the exponential function of x.
Log returns the natural logarithm of x ; log10 returns the base 10 logarithm.
Pow returns x\u\s8y\s10\d.
SEE ALSO
intro(3M)
DIAGNOSTICS
E, L, exp and
pow return the reserved operand on the VAX when the correct value would overflow;
errno is set to ERANGE.
Pow returns the reserved operand on the VAX and sets
errno to EDOM when the first argument is negative and the second is non-integral.
Log returns the reserved operand on the VAX when x is zero or negative; errno is set to EDOM.
AUTHOR
Kwok-Choi Ng