How do Optional Arguments Work?

Question

https://code.sololearn.com/859/#cs

Answer 1

You provide a default value to one of the function parameters, and if you decide not to pass that parameter, the default value is used. The ability for you to not pass the parameter is what makes it an optional argument.

Answer 2

@Daniel $á, your code link is erroneous, I try to open it, but in Code Playground it doesn't show in which language the code was written, save the code as a new C# code, then it will be okay.

Answer 3

I still dont understand how did i get 8 out of that... (maybe because Im tired?) xD i dont know