#include <iostream>
using namespace std;

class Complex
{
    float real, imag;

public:
    Complex()
    {
        real = 0;
        imag = 0;
    }

    Complex(float r, float i)
    {
        real = r;
        imag = i;
    }

    Complex operator+(Complex c)
    {
        Complex temp;
        temp.real = real + c.real;
        temp.imag = imag + c.imag;
        return temp;
    }

    Complex operator-(Complex c)
    {
        Complex temp;
        temp.real = real - c.real;
        temp.imag = imag - c.imag;
        return temp;
    }

    void operator-()
    {
        real = -real;
        imag = -imag;
    }

    bool operator==(Complex c)
    {
        return (real == c.real && imag == c.imag);
    }

    void display()
    {
        if (imag >= 0)
            cout << real << " + " << imag << "i" << endl;
        else
            cout << real << " - " << -imag << "i" << endl;
    }
};

int main()
{
    float r, i;
    cout << "Enter real and imaginary part of first number: ";
    cin >> r >> i;
    Complex c1(r, i);

    cout << "Enter real and imaginary part of second number: ";
    cin >> r >> i;
    Complex c2(r, i);

    Complex c3 = c1 + c2;
    Complex c4 = c1 - c2;

    cout << "\nc1 = ";
    c1.display();
    cout << "c2 = ";
    c2.display();
    cout << "c1 + c2 = ";
    c3.display();
    cout << "c1 - c2 = ";
    c4.display();

    if (c1 == c2)
        cout << "c1 and c2 are equal" << endl;
    else
        cout << "c1 and c2 are not equal" << endl;

    -c1;
    cout << "After unary minus, c1 = ";
    c1.display();

    return 0;
}