Question

An online test has this question:

Features of Read Only Variable:

1. It is allocated at compile time
2. Declaration and initialization is separated
3. It is allocated at runtime
4. All of these

The test gave the answer as 4. I get 2 and 3 but not sure about 1. Would this be an example of when the answer of 1 could occur:

private readonly int readonlyExample = 10;

Note: I would normally use a const for the example above

Answer 1

These possible answers are a bit confusing (in my opinion).

What is actually going on is the C# compiler actually emits something like this:

private readonly int readOnlyExample;

public YourClassConstructor()
{
    this.readOnlyExample = 10;
}

Given that, #2 seems like a possible choice. The declaration and assignment are separated. (What they even mean by that is up for grabs)

3 is also possibly correct because the value has to live in memory somewhere. It isn’t a compile time constant.