C# functions and optional parameters

Question

I know that in C# it is possible to define optional parameters. My question is directed at how flexible this is.

Let f be a function as below, with a

Answer 1

Using named arguments:

f(a: 5, c: 6);

Although, strictly speaking in my example, you don't have to qualify the a:

f(5, c: 6);

Answer 2

Try:

f(11, c: 33)

And take a look at the documentation

Answer 3

You can prefix the parameter with the argument name:

f(1, c:3);

Answer 4

You use named parameters:

f( a:100, c:300);