<div dir="auto">The mathematical concept of a point in R^2 is that a it is completely determined by the values of its coordinates. Same coordinates, same point. A square per se Is determined by the length of its side(s). There is no information about it's location.<div dir="auto"><br></div><div dir="auto">If I were writing a Square class for a graphics application I would include two member variables:</div><div dir="auto"><br></div><div dir="auto"> LocationOfLowerLeft point;</div><div dir="auto"> LengthOfSide double;</div><div dir="auto"><br></div><div dir="auto">I haven't written code for years so beware.<br><br><div data-smartmail="gmail_signature" dir="auto">---<br>Frank C. Wimberly<br>140 Calle Ojo Feliz, <br>Santa Fe, NM 87505<br><br>505 670-9918<br>Santa Fe, NM</div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jul 23, 2020, 3:58 PM uǝlƃ ↙↙↙ <<a href="mailto:gepropella@gmail.com">gepropella@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">No, I don't. What's the difference?<br>
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On 7/23/20 2:46 PM, Frank Wimberly wrote:<br>
> OK. As long as you grok the difference between the mathematical concept and the OO concept.<br>
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↙↙↙ uǝlƃ<br>
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