{{keywords>wiki library source code example reference}}
===== log =====
<code c>
    double log(double);
</code>
Natural logarithm of a number


===== C Sourcecode Example =====
compile in linux with: gcc log.c -o log **-lm** -Wall
<code c>     
#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */

#include <math.h> /* including math library */

int main ( void ) 
{
double x;
x = log(1.3);
printf("The log is %f\n",x);
return 0;
}
</code>

==== output ====
   output:
   user@host:~$  ./log 
   The log is 0.262364