public static void Main()
{
Tomcat tomcat1 = new Tomcat("Tomcat", 13);
Tomcat tomcat2 = new Tomcat("Tomcat", 3);
Tomcat tomcat3 = new Tomcat("Tomcat", 10);
Kitten kitten1 = new Kitten("Kitten", 1);
Kitten kitten2 = new Kitten("Kitten", 1);
Kitten kitten3 = new Kitten("Kitten", 9);
Dog dog1 = new Dog("Dog", 15, Gender.Female);
Dog dog2 = new Dog("Dog", 3, Gender.Male);
Dog dog3 = new Dog("Dog", 7, Gender.Female);
Frog frog1 = new Frog("Frog", 4, Gender.Female);
Frog frog2 = new Frog("Frog", 0, Gender.Male);
Frog frog3 = new Frog("Frog", 2, Gender.Female);
IList<Animal> animals = new List<Animal>
{
tomcat1, tomcat2, tomcat3, kitten1, kitten2, kitten3, dog1, dog2, dog3, frog1, frog2, frog3
};
tomcat1.ProduceSound();
kitten1.ProduceSound();
dog1.ProduceSound();
frog1.ProduceSound();
double catsAverage = animals
.Where(c => c is Cat)
.Average(c => c.Age);
double dogsAverage = animals
.Where(c => c is Dog)
.Average(c => c.Age);
double frogsAverage = animals
.Where(c => c is Frog)
.Average(c => c.Age);
Console.WriteLine("Average cats age: {0:F2}", catsAverage);
Console.WriteLine("Average dogs age: {0:F2}", dogsAverage);
Console.WriteLine("Average frogs age: {0:F2}", frogsAverage);
}
