Program to an Interface

A method that accepts an interface type works with any class that implements it. The IGreeting interface declares string Message(). Formal and Casual already implement it. In Welcomer, finish Welcome(IGreeting g) so it returns the greeting's Message() followed by , guest. Do NOT write a Main method.

For a Formal greeting the program prints the output shown in Expected Output.

For a Casual greeting it prints:
Hey, guest

Expected Output:

Good day, guest↵

= newline. The output ends with a newline — print one after the last line.

Hints2 available

Topics:

Polymorphism

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