Format
#include <math.h>
double log10(double x);Language Level: ANSI
Threadsafe: Yes.
Description
The log10() function calculates the base 10 logarithm of x.
Return Value
The log10() function returns the computed value. If x is negative, log10()sets errno to EDOM and might return the value -HUGE_VAL. If x is zero, the log10() function returns the value -HUGE_VAL, and might set errno to ERANGE.
Example that uses log10()
This example calculates the base 10 logarithm of 1000.0.
#include <math.h>
#include <stdio.h>
int main(void)
{
double x = 1000.0, y;
y = log10(x);
printf("The base 10 logarithm of %lf is %lf\n", x, y);
}
/******************** Output should be similar to: **************
The base 10 logarithm of 1000.000000 is 3.000000
*/Related Information