static void SingVerse(FarmAnimal animal)
{
//
// OLD MACDONALD
//
Console.WriteLine("Old MacDonald had a farm. ee aye ee aye oh");
Console.WriteLine($"And on his farm there was a {animal.Name}. ee ay ee ay oh");
Console.WriteLine($"With a {animal.MakeSoundTwice()} here and a {animal.MakeSoundTwice()} there.");
Console.WriteLine($"Here a {animal.MakeSoundOnce()}, there a {animal.MakeSoundOnce()}, everywhere a {animal.MakeSoundTwice()}.");
Console.WriteLine($"Old Macdonald had a farm. ee aye ee aye oh");
Console.WriteLine();
}
static void Main(string[] args)
{
List <ISound> animals = new List <ISound>();
//
// OLD MACDONALD
//
Console.WriteLine("Old MacDonald had a farm ee ay ee ay oh");
// Let's try singing about a Farm Animal
animals.Add(new Horse());
animals.Add(new Chicken());
animals.Add(new Ferrari());
animals.Add(new Pig());
foreach (var animal in animals)
{
Pig pig = animal as Pig;
if (pig != null)
{
Console.WriteLine($"Am I a FarmAnimal {((FarmAnimal)animal).MakeSoundTwice()}");
Console.WriteLine($"Or am i a Pig {pig.MakeSoundTwice()}");
Console.WriteLine();
}
if (animal is FarmAnimal)
{
FarmAnimal farmAnimal = (FarmAnimal)animal;
Console.WriteLine("And on his farm there was a " + farmAnimal.Name + " ee ay ee ay oh");
Console.WriteLine("With a " + farmAnimal.MakeSoundTwice() + " here and a " + farmAnimal.MakeSoundTwice() + " there");
Console.WriteLine("Here a " + farmAnimal.MakeSoundOnce() + ", there a " + farmAnimal.MakeSoundOnce() + " everywhere a " + farmAnimal.MakeSoundTwice());
Console.WriteLine("Old Macdonald had a farm, ee ay ee ay oh");
Console.WriteLine();
}
else
{
Console.WriteLine("I'm not a farm animal dude, have some respect.");
Console.WriteLine();
}
}
Console.WriteLine();
foreach (var animal in animals)
{
Console.WriteLine($"Sound I make going round and round is {animal.MakeSound()}");
}
// What if we wanted to sing about other things on the farm that were
// singable but not farm animals?
// Can it be done?
Console.ReadLine();
}
static void Main(string[] args)
{
//
// OLD MACDONALD
//
Chicken chicken = new Chicken();
Cow cow = new Cow();
Duck duck = new Duck();
Velociraptor cicero = new Velociraptor();
Platypus occam = new Platypus();
// Show implicit casting (Chicken to Farm Animal)
FarmAnimal console = duck;
Console.WriteLine(console.NameOfAnimal);
Console.WriteLine(console.MakeSoundOnce());
Console.WriteLine(console.MakeSoundTwice());
Console.WriteLine();
// Show explicit casting (FarmAnimal to Chicken)
Duck myDuck = (Duck)console;
Console.WriteLine(myDuck.NameOfAnimal);
Console.WriteLine(myDuck.MakeSoundOnce());
Console.WriteLine(myDuck.MakeSoundTwice());
Console.WriteLine();
//Applying Polymorphism, we're allowed to work in terms of
// generic types and not concrete classes. In this case
// the list holds a collection of IFarmAnimal, meaning
// any class that implements the IFarmAnimal interface is allowed
// to be in the list.
//Console.WriteLine("Old MacDonald had a farm ee ay ee ay oh");
//Console.WriteLine("And on his farm there was a " + chicken.NameOfAnimal + " ee ay ee ay oh");
//Console.WriteLine("With a " + chicken.MakeSoundTwice() + " here and a " + chicken.MakeSoundTwice() + " there");
//Console.WriteLine("Here a " + chicken.MakeSoundOnce() + ", there a " + chicken.MakeSoundOnce() + " everywhere a " + chicken.MakeSoundTwice());
//Console.WriteLine("Old Macdonald had a farm, ee ay ee ay oh");
//Console.WriteLine();
//Console.WriteLine("And on his farm there was a " + cow.NameOfAnimal + " ee ay ee ay oh");
//Console.WriteLine("With a " + cow.MakeSoundTwice() + " here and a " + cow.MakeSoundTwice() + " there");
//Console.WriteLine("Here a " + cow.MakeSoundOnce() + ", there a " + cow.MakeSoundOnce() + " everywhere a " + cow.MakeSoundTwice());
//Console.WriteLine("Old Macdonald had a farm, ee ay ee ay oh");
//Console.WriteLine();
//Console.WriteLine("And on his farm there was a " + duck.NameOfAnimal + " ee ay ee ay oh");
//Console.WriteLine("With a " + duck.MakeSoundTwice() + " here and a " + duck.MakeSoundTwice() + " there");
//Console.WriteLine("Here a " + duck.MakeSoundOnce() + ", there a " + duck.MakeSoundOnce() + " everywhere a " + duck.MakeSoundTwice());
//Console.WriteLine("Old Macdonald had a farm, ee ay ee ay oh");
//Console.WriteLine();
// ----- THIS IS GETTING REPETITIVE!
// We can do better
// How can we use what we've learned about inheritance
// to help us remove code duplication
//
// What if we create some sort of base class that all our animals have in common?
List <FarmAnimal> animals = new List <FarmAnimal>();
animals.Add(chicken);
animals.Add(cow);
animals.Add(duck);
Console.WriteLine("Old MacDonald had a farm ee ay ee ay oh");
foreach (FarmAnimal animal in animals)
{
Console.WriteLine("And on his farm there was a " + animal.NameOfAnimal + " ee ay ee ay oh");
Console.WriteLine("With a " + animal.MakeSoundTwice() + " here and a " + animal.MakeSoundTwice() + " there");
Console.WriteLine("Here a " + animal.MakeSoundOnce() + ", there a " + animal.MakeSoundOnce() + " everywhere a " + animal.MakeSoundTwice());
Console.WriteLine("Old Macdonald had a farm, ee ay ee ay oh");
Console.WriteLine();
}
// Interface
List <IFarmAnimal> interfaceAnimals = new List <IFarmAnimal>();
interfaceAnimals.Add(cicero);
interfaceAnimals.Add(occam);
Console.WriteLine();
Console.WriteLine("Old MacDonald had a farm ee ay ee ay oh");
foreach (IFarmAnimal animal in interfaceAnimals)
{
Console.WriteLine("And on his farm there was a " + animal.NameOfAnimal + " ee ay ee ay oh");
Console.WriteLine("With a " + animal.MakeSoundTwice() + " here and a " + animal.MakeSoundTwice() + " there");
Console.WriteLine("Here a " + animal.MakeSoundOnce() + ", there a " + animal.MakeSoundOnce() + " everywhere a " + animal.MakeSoundTwice());
Console.WriteLine("Old Macdonald had a farm, ee ay ee ay oh");
Console.WriteLine();
}
George friend = new George();
friend.Fly();
Console.WriteLine(friend.NameOfAnimal);
Console.WriteLine(friend.MakeSoundOnce());
Console.WriteLine(friend.MakeSoundTwice());
Console.WriteLine();
Console.WriteLine();
Console.WriteLine();
Console.WriteLine();
int width = 25;
Console.WriteLine(CreateRow("Employee", "Hours Worked", "Total Weekly Pay", width));
Console.WriteLine();
Console.WriteLine(CreateRow("Bob Mackey", "20", "200", width));
Console.WriteLine("{0, -20}{1, -20}{2, -20}", "Employee", "Hours Worked", "Total Weekly Pay");
Console.WriteLine();
Console.WriteLine("{0, -20}{1, -20}{2, -20}", "Bob Mackey", "20", "200");
Console.ReadKey();
}