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**y. 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