include iostream using namespace std union coordinate int integer doub

#include <iostream>

using namespace std;

union coordinate {
    int integer;
    double _double;

    void init() {
        cin >> _double;
        if ((int) _double == _double) {
            integer = (int) _double;
        }
    }

    double get() {
        if (_double != NULL) return _double;
        return integer;
    }
};

struct coordinate_system {
    coordinate x;
};

void insert(coordinate_system &point){
    cout << "Input x: ";
    point.x.init();
}

int main() {
    struct coordinate_system point;
    insert(point);
    cout << "x = " << point.x.get() << ";";
}