W3School TIY Editor

#include <iostream> #include <cmath> using namespace std; int main() { cout << log2(64.0) << "\n"; cout << log2(10.0f) << "\n"; cout << log2(3.1623) << "\n"; cout << log2(1.0) << "\n"; cout << log2(0.0f) << "\n"; cout << log2(-1.0f) << "\n"; return 0; }