How many boxing operations are made in this example? int i = 15; Console.WriteLine("Number: " + i + "Percent: "+ ((IFormattable)i).ToString("P", null));

15.

How many boxing operations are made in this example?

int i = 15;
Console.WriteLine("Number: " + i + "Percent: "+ ((IFormattable)i).ToString("P", null));

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Variable i casted to interface type (which always causes boxing), then String.Concat(object, object, object, object) is called which second argument is also gets boxed.