OOP 8.2 lab

#include <iostream>

using namespace std;

class Coord {
    float x, y;

    public:
        Coord() {}

        Coord(float a, float b) : x(a), y(b) {}

        friend Coord operator + (const Coord &a, const Coord &b);

        friend Coord operator + (const Coord &a, const float floatB);

        friend Coord operator - (const Coord &a, const Coord &b);

        friend Coord operator - (const Coord &a, const float floatB);

        bool operator == (const Coord &a) { return (this -> x == a.x && this -> y == a.y); }

        bool operator == (const float floatA) { return (this -> x == floatA && this -> y == floatA); }

        Coord& operator = (const Coord &a) {
            x = a.x; y = a.y;
            return *this;
        }

        Coord& operator = (const float a) {
            x = y = a;
            return *this;
        }

        void set(char c) {
            cout << endl << "Enter x & y of coordinate " << c << ": ";
            cin >> x >> y;
            return;
        }

        void get(char c) {
            cout << endl << "x & y of coordinate " << c << ": " << x << " " << y << endl;
            return;
        }
};

int main() {

    Coord a, b, c;
    float x;

    a.set('a');
    b.set('b');

    cout << "Enter number x: ";
    cin >> x;

    cout << endl << "==== operator + ====" << endl;
    a.get('a');
    b.get('b');
    cout << endl << "x = " << x << endl;
    c = a + b;
    cout << endl << "c = a + b" << endl;
    c.get('c');
    c = a + x;
    cout << endl << "c = a + x" << endl;
    c.get('c');

    //

    cout << endl << "==== operator - ====" << endl;
    a.get('a');
    b.get('b');
    cout << endl << "x = " << x << endl;
    c = a - b;
    cout << endl << "c = a - b" << endl;
    c.get('c');
    c = a - x;
    cout << endl << "c = a - x" << endl;
    c.get('c');

    //

    cout << endl << "==== operator == ====" << endl;
    a.get('a');
    b.get('b');
    cout << endl << "x = " << x << endl;
    c = a - b;
    cout << endl << "a == b = " << (a == b) << endl;
    cout << endl << "a == x = " << (a == x) << endl;

    //

    cout << endl << "==== operator = ====" << endl;
    a.get('a');
    cout << endl << "x = " << x << endl;
    c = a;
    cout << endl << "c = a" << endl;
    c.get('c');
    c = x;
    cout << endl << "c = x" << endl;
    c.get('c');

    return 0;
}

Coord operator + (const Coord &a, const Coord &b) {
    Coord c(a.x + b.x, a.y + b.y);
    return c;
}

Coord operator + (const Coord &a, const float floatB) {
    Coord c(a.x + floatB, a.y + floatB);
    return c;
}

Coord operator - (const Coord &a, const Coord &b) {
    Coord c(a.x - b.x, a.y - b.y);
    return c;
}

Coord operator - (const Coord &a, const float floatB) {
    Coord c(a.x - floatB, a.y - floatB);
    return c;
}