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<a name="Enabling-and-Disabling-Warnings"></a>
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Previous: <a href="Issuing-Warnings.html#Issuing-Warnings" accesskey="p" rel="prev">Issuing Warnings</a>, Up: <a href="Handling-Warnings.html#Handling-Warnings" accesskey="u" rel="up">Handling Warnings</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Enabling-and-Disabling-Warnings-1"></a>
<h4 class="subsection">12.2.2 Enabling and Disabling Warnings</h4>
<p>The <code>warning</code> function also allows you to control which warnings
are actually printed to the screen. If the <code>warning</code> function
is called with a string argument that is either <code>"on"</code> or <code>"off"</code>
all warnings will be enabled or disabled.
</p>
<p>It is also possible to enable and disable individual warnings through
their string identifications. The following code will issue a warning
</p>
<div class="example">
<pre class="example">warning ("example:non-negative-variable",
"'a' must be non-negative. Setting 'a' to zero.");
</pre></div>
<p>while the following won’t issue a warning
</p>
<div class="example">
<pre class="example">warning ("off", "example:non-negative-variable");
warning ("example:non-negative-variable",
"'a' must be non-negative. Setting 'a' to zero.");
</pre></div>
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