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<h4 class="subsection">2.1.7 Compiling the Parser Implementation File</h4>
<p><a name="index-compiling-the-parser-82"></a>
Here is how to compile and run the parser implementation file:
<pre class="example"> # <span class="roman">List files in current directory.</span>
$ <kbd>ls</kbd>
rpcalc.tab.c rpcalc.y
# <span class="roman">Compile the Bison parser.</span>
# <span class="roman">‘</span><samp><span class="samp">-lm</span></samp><span class="roman">’ tells compiler to search math library for </span><code>pow</code><span class="roman">.</span>
$ <kbd>cc -lm -o rpcalc rpcalc.tab.c</kbd>
# <span class="roman">List files again.</span>
$ <kbd>ls</kbd>
rpcalc rpcalc.tab.c rpcalc.y
</pre>
<p>The file <samp><span class="file">rpcalc</span></samp> now contains the executable code. Here is an
example session using <code>rpcalc</code>.
<pre class="example"> $ <kbd>rpcalc</kbd>
<kbd>4 9 +</kbd>
13
<kbd>3 7 + 3 4 5 *+-</kbd>
-13
<kbd>3 7 + 3 4 5 * + - n</kbd> <span class="roman">Note the unary minus, ‘</span><samp><span class="samp">n</span></samp><span class="roman">’</span>
13
<kbd>5 6 / 4 n +</kbd>
-3.166666667
<kbd>3 4 ^</kbd> <span class="roman">Exponentiation</span>
81
<kbd>^D</kbd> <span class="roman">End-of-file indicator</span>
$
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