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<h2 class="chapter">3 Bison Grammar Files</h2>
<p>Bison takes as input a context-free grammar specification and produces a
C-language function that recognizes correct instances of the grammar.
   <p>The Bison grammar file conventionally has a name ending in ‘<samp><span class="samp">.y</span></samp>’. 
See <a href="Invocation.html#Invocation">Invoking Bison</a>.
<ul class="menu">
<li><a accesskey="1" href="Grammar-Outline.html#Grammar-Outline">Grammar Outline</a>:    Overall layout of the grammar file. 
<li><a accesskey="2" href="Symbols.html#Symbols">Symbols</a>:            Terminal and nonterminal symbols. 
<li><a accesskey="3" href="Rules.html#Rules">Rules</a>:              How to write grammar rules. 
<li><a accesskey="4" href="Recursion.html#Recursion">Recursion</a>:          Writing recursive rules. 
<li><a accesskey="5" href="Semantics.html#Semantics">Semantics</a>:          Semantic values and actions. 
<li><a accesskey="6" href="Locations.html#Locations">Locations</a>:          Locations and actions. 
<li><a accesskey="7" href="Declarations.html#Declarations">Declarations</a>:       All kinds of Bison declarations are described here. 
<li><a accesskey="8" href="Multiple-Parsers.html#Multiple-Parsers">Multiple Parsers</a>:   Putting more than one Bison parser in one program. 
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