#include <stdio.h>
#include <math.h>
int main() {
printf("%f\n", log10(120.0));
printf("%f\n", log10(10.0));
printf("%f\n", log10(3.1623));
printf("%f\n", log10(1.0));
printf("%f\n", log10(0.0));
printf("%f\n", log10(-1.0));
return 0;
}