AutoCAD 2000 Visual Lisp Tutorial.pdf

Using Visual LISPDebugging ToolsIn This Chapter2This lesson teaches you how to use several valuableVLISP debugging tools that speed up the developmentof AutoLISP programs. You will also learn the differencebetween local and global variables, and when to usethem. Your program will become more active—promptingusers to enter some information. The informationwill be stored in a list and you’ll begin to understand■ Differentiating between Localand Global Variables■ Using Association Lists toBundle Data■ Examining Program Variables■ Revising the Program Code■ Commenting Program Code■ Setting a Breakpoint and UsingMore Watches■ Wrapping Up Lesson 2the power of using lists within your AutoLISP programs.After all, LISP got its name because it is a LISt Processinglanguage.13