#include <iostream>
#include <cmath>

int main() {
    double x = 1.0;
    double y = 1.0;
    double angle1 = atan(y / x);
    double angle2 = atan2(y, x);

    std::cout << "atan(y / x) = " << angle1 << " radians" << std::endl;
    std::cout << "atan2(y, x) = " << angle2 << " radians" << std::endl;

    return 0;
}