Currently going through DrRacket's "draw.ss" teachpack. There is a structure called "posn" defined in the following way.
*(struct posn (x y))* * * Also a function that returns a posn defined as: *(define (make-posn x y)* * (posn x y))* * * Using the draw-circle function defined in draw.ss, I wanted to draw a green circle centered at (posn 150 150), with radius 20. * * > (draw-circle (make-posn 150 150) 20 'green) . . draw-circle: expects a posn as first argument, given #<posn> I don't understand the above error. Draw-circle expects a posn structure, and DrRacket recognized that I gave it one. So where did the error stem from? Regards, Chun How
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