In Class Exercise Experiment with the operators given above. Display the average of three numbers. Display the area of a circle whose radius is 15 . Day 3 Finding errors Netscape provides JavaScript programmers with messages to help them find the problems in their programs. Variables are named containers which hold information.
Every variable has a type.
A Key word is an expression which is actually a part of the language you are using. The first JavaScript Key word we have seen is var. Like comments, I will use the convention of putting Key words in blue so they will stand out. A variable's name should describe what it does, this eliminates the need for comments. All variables should be declared at the beginning of a program.