> For the complete documentation index, see [llms.txt](https://raviram.gitbook.io/c-programing/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://raviram.gitbook.io/c-programing/oop-animals/stage-5-polymorphic-code.md).

# Stage 5: Polymorphic code

## Stage 5: Polymorphic code

### Highlights:

* From the previous stage the code will be modified to be polymorphic
* Objects are created in a different order to simulate fetching from a database or service
* All objects adhere to the required specifications
* Polymorphism and inheritance are used to treat all objects as similar types
* Collection initialization syntax is used to create anonymous objects
* Advanced for loop is used to iterate over the collection
* Type casting is used to access specific methods for different object types
* Interfaces and base classes can be used as types to make the code more uniform and manageable

### Animal.cs

No change!

### Bird.cs

No change!

### Cat.cs

No change!

### Dog.cs

No change!

### Eagle.cs

No change!

### ISingable.cs

No change!

### Parrot.cs

No change!

### Program.cs

```csharp
using MyApplication.Animals;

Animal[] animals = [
     new Eagle("Jack"),
     new Dog("Mike"),
     new Cat("Tom"),     
     new Parrot("Glory"),     
];

foreach (Animal animal in animals)
{
    Console.WriteLine($"{animal.Name} created!");

    animal.Eat();
    animal.Climb();    

    if(animal is Bird b)
      b.Fly();
    
    if(animal is ISingable s)
        s.Sing();
    Console.WriteLine();
}
```