public static void Main() { Kitten[] kittens = new[] { new Kitten("Hello Kitty", 4), new Kitten("Catwoman", 6), new Kitten("Thunder cat", 11) }; Tomcat[] tomcats = new[] { new Tomcat("Mr. Bigglesworth", 2), new Tomcat("Felix", 5), new Tomcat("Tom", 2) }; Dog[] dogs = new Dog[] { new Dog("Brian Griffin", 2, Genders.Male), new Dog("Too stupid dog", 5, Genders.Male), new Dog("Eddie from Frasier", 7, Genders.Male) }; Frog[] frogs = new[] { new Frog("Hypnotoad from Futurama", 13, Genders.Male), new Frog("Kermit", 50, Genders.Male), new Frog("Prince Charming", 30, Genders.Male), }; Console.WriteLine("Average kitten age: {0}", kittens.Average(n => n.Age)); Console.WriteLine("Average tomcat age: {0}", tomcats.Average(n => n.Age)); Console.WriteLine("Average dog age: {0}", dogs.Average(n => n.Age)); Console.WriteLine("Average frog age: {0}", frogs.Average(n => n.Age)); }