Delegates & events · interview question

What does this program print?

What does this code output?Hard

var actions = new List<Action>();
for (int i = 0; i < 3; i++)
{
    actions.Add(() => Console.Write(i));
}
foreach (var action in actions) action();

333012222Compile error

Answer and explanation

Correct answer

A. 333

Why

Lambdas capture the variable, not its value. A for loop has one i shared by all iterations; when the actions run, i is 3. Fix it with int copy = i; inside the loop and capture copy.

References

Microsoft Learn: Delegates (C# programming guide)

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