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+{{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

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