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authormuqiuhan <[email protected]>2023-06-22 10:35:05 +0000
committermuqiuhan <[email protected]>2023-06-22 10:35:05 +0000
commite6158eb85d917cea33aef29a0d51f6ca19718790 (patch)
tree2d6f64549bfc4bb013737bc89b9b4367e6e13e4c /2023/06/17
parentd74729c3b48689b7fe093aa2552033814699931e (diff)
downloadblog-e6158eb85d917cea33aef29a0d51f6ca19718790.tar.gz
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- Programming Language Concepts Reading Notes
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- Jun 17, 2023
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- <h1 id="Introduction"><a href="#Introduction" class="headerlink" title="Introduction"></a>Introduction</h1><blockquote>
-<p>how to represent arithmetic expressions and other program fragments as data structures in F# as well as Java, and how to compute with such program fragments. We also introduce various basic concepts of programming languages.</p>
-</blockquote>
-<h2 id="Syntax-and-Semantics"><a href="#Syntax-and-Semantics" class="headerlink" title="Syntax and Semantics"></a>Syntax and Semantics</h2><p>What does this (well-formed) program mean, how does it behave—what happens when we execute it?</p>
-<ul>
-<li>One may distinguish two kinds of syntax<ol>
-<li>By concrete syntax we mean the representation of a program as a text.</li>
-<li>By abstract syntax we mean the representation of a programs as a tree or by an object structure.</li>
-</ol>
-</li>
-<li>One may distinguish two kinds of semantics<ol>
-<li>Dynamic semantics concerns the meaning or effect of a program at run-time.</li>
-<li>Static semantics roughly concerns the compile-time correctness of the program (are variables declared, is the program well-typed, and so on)</li>
-</ol>
-</li>
-</ul>
-<p>Static semantics can be checked without executing the program, and may be enforced by closedness checks (type checks, type inference, and more…).</p>
-<p>In the conditional expression <code>if e1 then e2 else e3</code>, the interpreter might start by testing whether expressions e2 and e3 are syntactically identical, in which case there is no need to evaluate e1, only e2 (or e3). Although possible, <strong>this shortcut is rarely useful</strong>.</p>
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diff --git a/2023/06/17/发热及超高热危象/index.html b/2023/06/17/发热及超高热危象/index.html
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