Should 2 cups of uncooked macaroni equals 4 cooked?

No. Two cups of uncooked macaroni will not equal four cups of cooked macaroni. When macaroni is cooked, it absorbs water and expands in size. The amount of water absorbed will vary depending on the type of macaroni and the cooking method, but as a general rule, one cup of uncooked macaroni will yield approximately two cups of cooked macaroni.