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log10, log10f : base 10 logarithms

#include <math.h>
double log10(double x);
float log10f(float x);
```### Description
log10 returns the base 10 logarithm of x. It is implemented as log(x) / log(10). log10f is identical, save that it takes and returns float values.### Returns
log10 and log10f return the calculated value. See the description of log for information on errors.
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**Authoritative source**: BUSMASTER DITA help source `log10.dita`, compiled into `BUSMASTER.CHM` with the application.