I used the dotnetfiddle.net online tool to test with the C# programming language.
The test is about the ref and out keywords and how these works.
First, the ref keyword indicates that a value is passed by reference. It is used in four different contexts, see the documentation.
The out keyword causes arguments to be passed by reference, see the documentation.
Let’s see a more simple example, also follow the comments to understand how this works:

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