// Exercise 3g from Lecture 3

using System;

// public class Complex {


public class Complex {
    // explicit fields:
    //public int Real;
    //public int Imag;

    // automatic properties:
  public int Real { get ; /* set ; */ }
  public int Imag { get ; /* set ; */ }

    public Complex () {}
  
    public Complex (int r, int i) {
      this.Real = r;
      this.Imag = i;
    }
  
    public override string ToString() {
      return this.Real.ToString()+"+"+this.Imag.ToString()+"i";
    }
  
    public static Complex operator+ (Complex a, Complex b) 
    {
      return new Complex(a.Real + b.Real, a.Imag + b.Imag); 
    }
}


public class Tester {  
  public static void Main (string []args) {
     if (args.Length != 4) { // expect 4 args: r1 i1 r2 i2
       System.Console.WriteLine("Usage: exercise3g <int> <int> <int> <int>");
     } else {
       int r1 = Convert.ToInt32(args[0]);
       int i1 = Convert.ToInt32(args[1]);
       int r2 = Convert.ToInt32(args[2]);
       int i2 = Convert.ToInt32(args[3]);
       {
	 Complex c1 = new Complex(r1,i1);
	 Complex c2 = new Complex(r2,i2);
	 System.Console.WriteLine("Complex addition: {0} + {1} = {2}", c1, c2, c1+c2);
       }
       {
	 Complex c1 = new Complex(1,2);
	 Complex c2 = new Complex(3,4);
	 System.Console.WriteLine("Complex addition: {0} + {1} = {2}", c1, c2, c1+c2);
       }
       {
	 Complex c1 = new Complex();
	 Complex c2 = new Complex();
	 c1.Real = 1; c1.Imag = 2;
	 c2.Real = 3; c2.Imag = 4;
	 System.Console.WriteLine("Complex addition: {0} + {1} = {2}", c1, c2, c1+c2);
       }
       {
	 Complex c1 = new Complex();
	 Complex c2;
	 c1.Real = 1; c1.Imag = 2;
	 c2 = c1; 
	 c2.Real = 3; c2.Imag = 4;
	 System.Console.WriteLine("%%% Complex addition: {0} + {1} = {2}", c1, c2, c1+c2);
       }
       
     }
  }

}