W3School TIY Editor

#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; }