...
Variables within this section of basics provide numbers for constants within AutoCAD or specify AutoCAD versions. Additionally, this section includes functions which limit the significant figures for numbers used in AutoCAD programs.
acadversion - a variable that is given as an input by the user specifying the version of AutoCAD being utilized. AguaClara lab is currently using AutoCAD 2006.
acadversion := 2008(AutoCAD version year here)
sp - a variable that provides a space in AutoCAD code
sp := " "
...