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<title>Bison 3.0.2: The YYPRINT Macro</title>

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<a name="The-YYPRINT-Macro"></a>
<div class="header">
<p>
Previous: <a href="Mfcalc-Traces.html#Mfcalc-Traces" accesskey="p" rel="prev">Mfcalc Traces</a>, Up: <a href="Tracing.html#Tracing" accesskey="u" rel="up">Tracing</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index-of-Terms.html#Index-of-Terms" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="The-YYPRINT-Macro-1"></a>
<h4 class="subsection">8.4.3 The <code>YYPRINT</code> Macro</h4>

<a name="index-YYPRINT"></a>
<p>Before <code>%printer</code> support, semantic values could be displayed using the
<code>YYPRINT</code> macro, which works only for terminal symbols and only with
the <samp>yacc.c</samp> skeleton.
</p>
<dl>
<dt><a name="index-YYPRINT-1"></a>Macro: <strong>YYPRINT</strong> <em>(<var>stream</var>, <var>token</var>, <var>value</var>);</em></dt>
<dd><a name="index-YYPRINT-2"></a>
<p>If you define <code>YYPRINT</code>, it should take three arguments.  The parser
will pass a standard I/O stream, the numeric code for the token type, and
the token value (from <code>yylval</code>).
</p>
<p>For <samp>yacc.c</samp> only.  Obsoleted by <code>%printer</code>.
</p></dd></dl>

<p>Here is an example of <code>YYPRINT</code> suitable for the multi-function
calculator (see <a href="Mfcalc-Declarations.html#Mfcalc-Declarations">Declarations for <code>mfcalc</code></a>):
</p>
<div class="example">
<pre class="example">%{
  static void print_token_value (FILE *, int, YYSTYPE);
  #define YYPRINT(File, Type, Value)            \
    print_token_value (File, Type, Value)
%}

&hellip; %% &hellip; %% &hellip;

static void
print_token_value (FILE *file, int type, YYSTYPE value)
{
  if (type == VAR)
    fprintf (file, &quot;%s&quot;, value.tptr-&gt;name);
  else if (type == NUM)
    fprintf (file, &quot;%d&quot;, value.val);
}
</pre></div>





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