Exhibit No. 11 CNS, INC. Computation of Net Income per Share of Common Stock Three Months Ended March 31, -------------------------------- 1998 1997 -------------- ------------- NET INCOME Net income $ 15,288 $ 1,321,493 =========== =========== BASIC NET INCOME PER SHARE Weighted average number of common shares outstanding 18,374,000 19,205,000 =========== =========== Basic net income per share $ .00 $ .07 =========== =========== DILUTED NET INCOME PER SHARE Weighted average number of common shares outstanding 18,374,000 19,205,000 Incentive stock options 205,000 520,000 Non qualified stock options 173,000 319,000 ----------- ----------- Weighted average number of common and assumed conversion shares 18,752,000 20,044,000 =========== =========== Diluted net income per share $ .00 $ .07 =========== ===========