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#include <iostream>
#include <vector>
#include <set>
#include <map>
#include <unordered_map>
#include <stack>
#include <algorithm>
#include <queue>
#include <iomanip>

using namespace std;

class test{
    int x, y, z;
    
    public:
    test(){
        cout << "default contructor" << endl;
    }
    
    test(int x, int y, int z){
        this->x = x;
        this->y = y;
        this->z = z;
    }
    //void operator /();
    void operator -();
    friend test operator << (test t1, test t2);
    void showData();
};

void test :: showData(){
    cout << "x = " << x << endl;
    cout << "y = " << y << endl;
    cout << "z = " << z << endl;
}

// void test :: operator/(){
//     x = x / 2;
//     y = y / 2;
//     z = z / 2;
// }

void test :: operator-(){
    x = -x;
    y = -y;
    z = -z;
}

test operator <<(test obj1, test obj2){
    test obj3;
    obj3.x = obj1.x * obj2.x;
    obj3.y = obj1.y * obj2.y;
    obj3.z = obj1.z * obj2.z;
    return obj3;
}

int main(){
    test t1(100, 200, 300), t2(1, 2, 3), t3;
    -t1;
    ///t1;
    t1.showData();
    //t1/;
    -t1;
    t1.showData();
    t3 = t1 << t2;
    t3.showData();
    //t1/;
    -t1;
    t1.showData();
}