<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div></div><div>TI graphing calculators (at least the ones I've used have different buttons for binary and prefix -, does that count? I'm not sure if they behave differently WRT precedence, though.</div><div><br></div><div>What if an operator's precedence could be changed by specific functions? Like +(Int, Int) -> Int is 100 (or whatever the default is), but +(MyType, MyType) has precedence 3?</div><div><br></div><div>Does that break anything?</div><div><br>On Jan 19, 2016, at 22:54, Jason Nielsen via swift-evolution <<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr">If you can find a mathematically oriented text that distinguishes between binary and prefix in regards to "-" I'll buy you a salad.<div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jan 18, 2016 at 11:58 AM, Sune Foldager <span dir="ltr"><<a href="mailto:cyano@me.com" target="_blank">cyano@me.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">> On 17 Jan 2016, at 18:19, Jason Nielsen via swift-evolution <<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>> wrote:<br>
> I'm afraid that is not a correct statement. There is no arguing that -3^2 is -9 and that -3^2 and 0-3^2 are equivalent mathematically. Exponentiation has higher precedence than - and subtraction is definitely an operator so -3^2 != (-3)^2.<br>
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</span>A minus sign can represent both a part of an integer, a binary operator called subtraction and sometimes a prefix operator called negation, as far as mathematics go.<br>
<span class="HOEnZb"><font color="#888888"><br>
-Sune<br>
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