Autolisp In Autocad Apr 2026

: To create a custom command that can be typed into the AutoCAD command line, use the defun function with a C: prefix. For instance, (defun C:HELLO () (prompt "\nHello World!")) defines a new command called HELLO .

: In AutoLISP, the function name always comes first, followed by its arguments. For example, to add two numbers, you write (+ 1 2) instead of 1 + 2 . AutoLISP in AutoCAD

The fundamental rule of AutoLISP is that every statement must be enclosed in parentheses. This structure is known as an S-expression (symbolic expression). : To create a custom command that can