#include <iostream>
class A{
int _x, _y;
public:
A(int x = 1, int y = 2) : _x(x), _y(y){}
int x() const{
return _x;
}
int y() const{
return _y;
}
};
int main() {
A a, b(3,4);
std::cout << "a: " << a.x() << " " << a.y() << std::endl;
std::cout << "b: " << b.x() << " " << b.y() << std::endl;
}
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