Simple calculator for use inside Autocad. Most useful with DOS versions of Autocad, because you can use the Windows calculator in Windows-versions.
The results will be piped to the command prompt, so you can make a calculation, transparant inside a commando, where the result will be used as input for that commando. Due to the restrictions of Autolisp, this is only possible with internal Autocad commands, not for Autolisp command prompts.