1ti

#include <iostream>
using namespace std;

class Complex{
	private:
		int i, j;
	public:
		Complex(int ii=0, int jj=0){
		i=ii;
		j=jj;
		}
		Complex(Complex &c){
			i=c.i;
			j=c.j;
		}
	void Display(){
		    cout<<i;
    		if(j>=0)
        	cout<<"+";
    		cout<<j<<"i"<<endl;
	}
	friend Complex AddComplex(Complex c3, Complex c4){
		c3.i+=c4.i;
		c3.j+=c4.j;
		return c3;
	}
};

int main(){
	int x,y;
	cin>>x>>y;
        Complex  c0(x,y);
        Complex  c1(c0);
        cout<<"c1 is: "; 
        c1.Display();
        cin>>x>>y; 
        Complex c2(x,y);
        cout<<"c2 is: "; 
        c2.Display();
        Complex c3;
        c3 = AddComplex(c1,c2); 
        cout<<"c3 is: "; 
        c3.Display();	
        return 0;
}