makes me crazy

[Han]

The #cas #end is like a pragma and simply tells the compiler that everything in between should be interpreted as if it were entered from the CAS view. This prevents things like parsing errors where a variable is used but has not been declared (an problem if found in a "Home" program but not an issue if implemented in a "CAS" program).

When creating a new program (on the calculator) there is an option to select whether or not the program is a CAS program. If so, the editor will provide a generic skeleton of one.