static void Main(string[] args) { Complex C1 = new Complex(1, 2); Complex C2 = new Complex(3, 4); Complex C3 = C1 + C2; Console.WriteLine("C1={0}", C1); Console.WriteLine("C2={0}", C2); Console.WriteLine("C3={0}", C3); Math mth = new Math(); Complex C4 = mth.Add(C2, C3); Console.WriteLine("C4={0}", C4); }