Running the program

Let's go ahead and run this. Go to Debug > Start Without Debugging or use Ctrl + F5. You should see the following:

Figure 5.2: The Debug screen

It should say I move by flapping my fins., which is correct. Now, let's head back to our code and change it so that we create a Human object, rather than Fish. The changed line should read as follows:

Movable movableObject = new Human(); 

All we've done here is replace Fish with Human; we're creating a different type of object. Let's go ahead and run this new code. Go to Debug > Start Without Debugging and you should see the following:

Figure 5.3: The Debug screen

Perfect! Close this and there you go. This is the new power of switch blocks in C# 7. You can now pass in a whole object unlike before. Here's the complete code from this chapter:

using static System.Console; //needed for WriteLine 
interface Movable 
{ 
    void Move(); //this method has to be implemented by classes that implement 
    the interface Movable 
} 
class...