Will return a real to an integer.
A coworker that uses civil needed to make a polyline that ran along a bank. He needed to just move his mouse along an image to show where the top of a ditch was. I gave the lisp 2 inputs which were start point and increment distance and it places a vertex for a polyline on where the mouse moves over the drawing area based off the previous point and the distance typed in.
(fix 2.3942) will return 2