I think they just want you to initialize an array add three values to it. Here is how you can initialize an array and add values to it.

Method 1:

int[] arr = new int[5] arr[0] = 1; arr[1] = 2; arr[2] = 3;

Method 2:

int[] arr =new int[5] { 1, 2, 3 };

https://www.completecsharptutorial.com/basic/storing-values.php

Here 1,2,3 are programmer-defined the values

I am not a C# sharp developer so I don't know how to create a console application. I found the following article that might need help get started in case you are confused about that part:

https://docs.microsoft.com/en-us/dotnet/core/tutorials/with-visual-studio-code

The only part I can't figure out if the one-line instructions above is asking for the values to be inputted through the command prompt. In that case you can use args in the main method to retrieve the command line arguments. The following article should have more info and even some examples.

https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/main-and-command-args/command-line-arguments

I hope this helps in some way.