[robocop]

I think the convention for chord notation is different to the convention for scale degrees. The 7th note in C major is B, but a C7 has a Bb.

[_mayo]

Major 7 chords are explicitly written as such. So in the case of a C chord with a major 7, it would be noted as Cmaj7.

[robocop]

TBH I think you should delete this post. I think I would have been confused had I read it when I was learning harmony theory. Please see http://www.idlewords.com/2005/04/dabblers_and_blowhards.htm.