I am a Zambian, l am doing computer science at University of Zambia, l have been using yo videos. You are very good teacher. If every teacher was like u, school would have been a better place and very interesting. Keep it up sir. Yo videos have helped me.
sir, you wrote document.write("Sum Of Three Numbers Is ,res") ; Then windows.alert(" Sum Of Three Number Is, +res"); Why did u write +res instead of ,res ?