How can a loop be interrupted in AutoLISP language?

In AutoLISP language, you can use the keywords exit or return to interrupt a loop.

Here is an example of using ‘exit’ in a loop to interrupt the loop and display a message:

(defun test-loop ()
  (setq i 0)
  (repeat 10
    (setq i (1+ i))
    (if (= i 5)
      (progn
        (exit)
        (princ "\nLoop interrupted at i = 5"))
      (princ (strcat "\ni = " (itoa i))))))

In this example, the repeat loop goes from 1 to 10. When the value of i equals 5, the exit function is called to interrupt the loop and display the message “Loop interrupted at i = 5”. The loop will be immediately halted and no further iterations will be carried out.

Please note that the exit function can be used not only to break out of loops, but also to interrupt other types of code blocks, such as while loops or foreach loops.

Additionally, you can use the return keyword to break the loop, which has the same effect as exit.