Enum addition vs subtraction and casting

Question

Why does addition require a cast but subtraction works without a cast? See the code below to understand what I am asking

public enum Stuff
{
    A = 1,
             


        

Answer 1

The default values for enums are 0,1,2... so in this case the difference between two enums will create another enum (compare them first to make sure you are subtracting the smaller from the larger).

Half the time addition will create a value too high to be a valid enum.