#include <iostream> #include <cmath> using namespace std; int main() { const double E = 2.718281828; cout << log(6.0f) << "\n"; cout << log(E) << "\n"; cout << log(2.0) << "\n"; cout << log(1.0) << "\n"; cout << log(0.0) << "\n"; cout << log(-1.0f) << "\n"; return 0; }