a guestion about "getpoint"

(getpoint "input a point : ")

if user input an int such as 222, CAD will return a point such as
(199.698 -96.9774 0.0) .

Why this happens?
How to prevent this kind of error?

thanks homling pen

 

This is not an error. The point returned (in your example) would be 222
units in the direction the crosshairs were from the last point entered.
There might be an easier way but here is my first thought to prevent this.

;;;Ken Alexander
;;;Allows only point to be
;;;picked on screen
;;;Usage:
;;;(get_only_pnt "Get first point: ")

(defun get_only_pnt (txt / a)
(while (= 'str
(type
(progn
(initget 135)
(setq a (getpoint txt))
)
)
)
)
a
)

Ken Alexander