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<a name="Mfcalc-Rules"></a>
<div class="header">
<p>
Next: <a href="Mfcalc-Symbol-Table.html#Mfcalc-Symbol-Table" accesskey="n" rel="next">Mfcalc Symbol Table</a>, Previous: <a href="Mfcalc-Declarations.html#Mfcalc-Declarations" accesskey="p" rel="prev">Mfcalc Declarations</a>, Up: <a href="Multi_002dfunction-Calc.html#Multi_002dfunction-Calc" accesskey="u" rel="up">Multi-function Calc</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>
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<hr>
<a name="Grammar-Rules-for-mfcalc"></a>
<h4 class="subsection">2.5.2 Grammar Rules for <code>mfcalc</code></h4>

<p>Here are the grammar rules for the multi-function calculator.
Most of them are copied directly from <code>calc</code>; three rules,
those which mention <code>VAR</code> or <code>FNCT</code>, are new.
</p>
<div class="example">
<pre class="example">%% /* The grammar follows.  */
</pre><pre class="example">input:
  %empty
| input line
;
</pre><pre class="example">
</pre><pre class="example">line:
  '\n'
| exp '\n'   { printf (&quot;%.10g\n&quot;, $1); }
| error '\n' { yyerrok;                }
;
</pre><pre class="example">
</pre><pre class="example">exp:
  NUM                { $$ = $1;                         }
| VAR                { $$ = $1-&gt;value.var;              }
| VAR '=' exp        { $$ = $3; $1-&gt;value.var = $3;     }
| FNCT '(' exp ')'   { $$ = (*($1-&gt;value.fnctptr))($3); }
| exp '+' exp        { $$ = $1 + $3;                    }
| exp '-' exp        { $$ = $1 - $3;                    }
| exp '*' exp        { $$ = $1 * $3;                    }
| exp '/' exp        { $$ = $1 / $3;                    }
| '-' exp  %prec NEG { $$ = -$2;                        }
| exp '^' exp        { $$ = pow ($1, $3);               }
| '(' exp ')'        { $$ = $2;                         }
;
</pre><pre class="example">/* End of grammar.  */
%%
</pre></div>




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