HP 3000 Manuals HP 3000 Manuals
log, log10
Syntax
#include <math.h>
double log (double x);
double log10 (double y);
Parameters
x A real number whose natural logarithm is to be returned.
y A real number whose logarithm in base 10 is to be returned.
Return Values
n The logarithm of the input value x.
-HUGE The input value x is <=0, and errno is set to EDOM. A
DOMAIN error or SING error if x=0 is printed on the
standard error output device.
Description
The log function returns the natural logarithm of x. The value of x must
be positive.
The log10 function returns the logarithm base ten of x. The value of x
must be positive.
Error handling can be changed by a user-written matherr function.
See Also
matherr(), ANSI C 4.5.4.4, POSIX.1 8.1