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<title>Manually (Debugging with GDB)</title>
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<a name="Setting-the-Working-Language"></a>
<h4 class="subsection">15.1.2 Setting the Working Language</h4>
<p>If you allow <small>GDB</small> to set the language automatically,
expressions are interpreted the same way in your debugging session and
your program.
</p>
<a name="index-set-language"></a>
<p>If you wish, you may set the language manually. To do this, issue the
command ‘<samp>set language <var>lang</var></samp>’, where <var>lang</var> is the name of
a language, such as
<code>c</code> or <code>modula-2</code>.
For a list of the supported languages, type ‘<samp>set language</samp>’.
</p>
<p>Setting the language manually prevents <small>GDB</small> from updating the working
language automatically. This can lead to confusion if you try
to debug a program when the working language is not the same as the
source language, when an expression is acceptable to both
languages—but means different things. For instance, if the current
source file were written in C, and <small>GDB</small> was parsing Modula-2, a
command such as:
</p>
<div class="smallexample">
<pre class="smallexample">print a = b + c
</pre></div>
<p>might not have the effect you intended. In C, this means to add
<code>b</code> and <code>c</code> and place the result in <code>a</code>. The result
printed would be the value of <code>a</code>. In Modula-2, this means to compare
<code>a</code> to the result of <code>b+c</code>, yielding a <code>BOOLEAN</code> value.
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