Using QGIS, how can I create attributes within a polygon layer based from a selection in that layer?

Question

I'd like to add a column, or attribute rather, to selected rows within a polygon layer. I would simply like to make a binary system, where those that are selected receive a "1,' let's say, and all others are represented by a "0." How can I do this?

Answer 1

Nevermind- using edit > field calculator > and entering a value for only selected features should do the trick! I can replace NULL values using field calculator from there.