#include <iostream>

int process(int x) { return x * 2; }
int process(double x) { return (int)(x * 2); }
int process(int x, double y) { return x + (int)y; }

namespace Math {
    double sqrt(double x) { return x * 0.5; }
}

class Vector {
public:
    double x, y;
    double dot(const Vector& v) { return x * v.x + y * v.y; }
};

extern "C" {
    int legacy_init(void) { return 0; }
    void legacy_free(void* p) { (void)p; }
}

int main() {
    std::cout << "process(3)      = " << process(3) << "\n";
    std::cout << "process(3.0)    = " << process(3.0) << "\n";
    std::cout << "process(3, 4.0) = " << process(3, 4.0) << "\n";
    std::cout << "Math::sqrt(9)   = " << Math::sqrt(9.0) << "\n";

    Vector a{1, 2}, b{3, 4};
    std::cout << "a.dot(b)        = " << a.dot(b) << "\n";

    std::cout << "legacy_init()   = " << legacy_init() << "\n";
    return 0;
}