prompt vs princ

When should I use (princ ) or (prompt ) ????

use Prompt when sharing the code with noobs. and princ when they now that there is no difference.

High-five, Flower

Actually (prompt) always returns nil (princ) only returns nil when called less a 'STR parameter.

(and (setq a (+ 1 1))
    (princ "\nI Want To Continue)
    (setq b (+ a 1))
    (prompt "\nI'm Stopping Now)
    (setq c (+ b 1))
    (princ))

With the 1st (princ) call, b is bound to (+ 1 a). Because of the (prompt) call, c is not bound to a value. With the last (princ) call, the function would return nil and exit cleanly. -David

prompt
(prompt msg)
On dual-screen AutoCAD configurations, prompt displays msg on both
screens and is, therefore, preferable to princ.

I generally use princ since it won't interrupt and and statement.

Here's another reason:

Command: (prompt (list "A" "B" "D"))

Error: bad argument type: stringp ("A" "B" "D")
Command: (princ (list "A" "B" "D"))
(A B D)("A" "B" "D")