After a program is compiled, it must be loaded before you can be used.
For example, to load the compiled yinyang program, enter the following and press Enter:
(load "c:/program files/Autodesk/<AutoCAD installation directory>/sample/visuallisp/yinyang.fas")
For example:
(yinyang)
Visual LISP transfers control to the current drawing in the AutoCAD environment to display program prompts and accept user input. If the name of the function you are running begins with c:, you can invoke it from the AutoCAD Command prompt as if it were an AutoCAD command, that is, without enclosing the name in parentheses.