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2008-09-16T09:57:03.767
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Precedence and associativity both specify how and in which order a term should be split into subterms. In other words does it specifies the rules where brackets are to be set implicitly if not specified explicitly. If you've got a term without brackets, you start with operators with lowest precedence and enclose it in brackets. For example: Precendences: <ol> <li>.</li> <li>!</li> <li>*,/</li> <li>+,-</li> <li>==</li> <li>&& </li> </ol> The term: <pre><code>!person.isMarried && person.age == 25 + 2 * 5 </code></pre> would be grouped like that: <ol> <li>!(person.isMarried) && (person.age) == 25 + 2 * 5</li> <li>(!(person.isMarried)) && (person.age) == 25 + 2 * 5</li> <li>(!(person.isMarried)) && (person.age) == 25 + (2 * 5)</li> <li>(!(person.isMarried)) && (person.age) == (25 + (2 * 5))</li> <li>(!(person.isMarried)) && ((person.age) == (25 + (2 * 5)))</li> <li>((!(person.isMarried)) && ((person.age) == (25 + (2 * 5))))</li> </ol> One very common rule is the precedence of * and / before + and - . Associativity specifies in which direction operators of the same precedence are grouped. Most operators are left-to-right. Unary prefix operators are right-to-left. Example: <pre><code>1 + 2 + 3 + 4 </code></pre> is grouped like that: <ol> <li>(1 + 2) + 3 + 4</li> <li>((1 + 2) + 3) + 4</li> <li>(((1 + 2) + 3) + 4)</li> </ol> while !!+1 is grouped as <ol> <li>!!(+1)</li> <li>!(!(+1))</li> <li>(!(!(+1)))</li> </ol> So far everything complies to the BODMAS/PEDMAS rules which differences have you experienced?
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1. POWhat is the difference between precedence, associativity, and order?
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1. USjrudolph
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