#include <iostream>
#include <cmath>

#define ESP 1e-6

using namespace std;

class comp {
	float Re, Im;
	
	public:
		comp() {}

		comp& operator = (const comp &x) {
			Re = x.Re;
			Im = x.Im;
			return *this;
		}
		comp& operator -= (const comp &x) {
			Re -= x.Re;
			Im -= x.Im;
			return *this;
		}
		
		friend comp operator + (const comp &a, const comp &b);

		bool operator == (const comp &x) {
			return(this -> Re == x.Re && this -> Im == x.Im);
		}
		
		void set(char s) {
			cout<<"Enter comp numb "<<s<<":"<<endl;
			cout<<"\tRe: ";
			cin>>Re;
			cout<<"\tIm: ";
			cin>>Im;
			return;
		}
		
		void get(char s);
};
int main () {
	comp a, b, c;
	a.set('a');
	b.set('b');

	cout<<"operator -="<<endl;
	cout<<"before"<<endl;
	a.get('a');
	b.get('b');
	cout<<"after"<<endl;
	a -= b;
	a.get('a');
	b.get('b');

	cout<<"operator +"<<endl;

	a.get('a');
	b.get('b');

	c = a + b;

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

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

	cout<<"a == b"<<endl;
	if(a == b) {
		cout<<"true";
	} else {
		cout<<"false";
	}

	a = b;

	cout<<"  a assigned b :"<<endl;

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

	cout<<"a == b"<<endl;
	if(a == b) {
		cout<<"true";
	} else {
		cout<<"false";
	}
	return 0;
}
comp operator + (const comp &a, const comp &b) {
	comp c;
	c.Re = a.Re + b.Re;
	c.Im = a.Im + b.Im;
	return c;
}

bool zero(double x) {
	return fabs(x) <= ESP; //було так return fabs(x) > ESP; 
}
void comp :: get(char s) {
	cout <<"comp numb "<<s<<": ";
	if(!zero(Re)) {
		cout<<Re;
	}
	if(!zero(Im)) {
		if(!zero(Im) && Im > 0) {
			cout<<" + ";
		}
		if(Im < 0) {
			cout<<" - ";
		}
		cout << abs(Im)<<"i";
	}
	cout <<endl;
	return;
}