{{keywords>wiki library source code example reference}}
====== log10 ======
<code c>
    double log10(double);
</code>
base-10 logarithm of a number

===== C Sourcecode Example =====
compile in linux with: gcc log10.c -o log10 **-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 = log10(42000);
printf("The log10 of 42000 is %f\n",x);
return 0;
}
</code>

==== output ====
   output:
   user@host:~$  ./log10 
   The log10 of 42000 is 4.623249