include iostream using namespace std union point int decimal double _f

#include <iostream>

using namespace std;

union point {
    int decimal;
    double _float;

    void init() {
        cin >> _float;
        if ((int) _float == _float) {
            decimal = (int) _float;
        }
    }

    double get() {
        if (_float != NULL) return _float;
        return decimal;
    }
};

struct points {
    point value;
};

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

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