N.C. Gen. Stat. § 24-6: Clerk to ascertain interest upon default judgment on bond, covenant, bill, note or signed account.

When a suit is instituted on a single bond, a covenant for the payment of money, bill of exchange, promissory note, or a signed account, and the defendant does not plead to issue thereon, upon judgment, the clerk of the court shall ascertain the interest due by law, without a writ of inquiry, and the amount shall be included in the final judgment of the court as damages, which judgment shall be rendered therein in the manner prescribed by § 24-5. (1797, c. 475, P.R.; R.C., c. 31, s. 91; Code, s. 531; Rev., s. 1956; C.S., s. 2310.)