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+<title>arg_count — Ludic</title>
+<meta name="description" content="The number of command-line arguments, counting the program name.">
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+  <div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="api.html#builtins">Builtin functions</a> <span>›</span> <span class="here">arg_count</span></div>
+  <div class="item-head">
+    <span class="kind-badge kind-builtin">function</span>
+    <h1 id="top">arg_count</h1>
+  </div>
+  <code class="sig">arg_count() -&gt; int</code>
+  <div class="desc"><p>Returns how many command-line arguments the program received, including the program name at index <code>0</code>. So a program run with no user arguments reports <code>1</code>, and each added argument raises the count by one. Use it to validate that the required arguments were supplied and to bound the index you pass to <code>arg</code>. It takes no arguments and is the natural companion to <code>arg</code> when building command-line tools.</p></div>
+  
+  <div class="examples"><h2>Example</h2><pre data-lang="ludic">program PrintAllArgs {
+  handler ListArgs phase Start {
+    print(arg_count())
+    for index in 0 .. arg_count() {
+      print(arg(index))
+    }
+  }
+}</pre></div>
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