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<div role="main"><h1>Adding watchpoints</h1>
<p>A watchpoint is a special breakpoint that stops the execution of an
application whenever the value of a given expression changes, without specifying
where it might occur. Unlike breakpoints (which are line-specific), watchpoints
are associated with files. They take effect whenever a specified condition is
true, regardless of when or where it occurred. You can set a watchpoint on a global variable by highlighting the variable in the editor, or by selecting it in the Outline view. </p>
<p>To set a watchpoint on a global variable:</p>
<ol>
<li>Highlight the variable in the editor, or select it in the Outline view.</li>
<li>Click <strong>Run > Toggle Watchpoint</strong>.</li>
<li>Do any of the following:
<ul><li>To stop execution when the watch expression is read, select the
<strong>Read</strong> check box.</li>
<li>To stop execution when the watch expression is written to, select the <strong>Write</strong>
check box.</li></ul>
</li>
<li>The watchpoint appears in the <strong>Breakpoints</strong> view
list.</li>
</ol>
<p><img src="../images/ngconcepts.gif" ALT="Related concepts" width="143" height="21">
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<a href="../concepts/cdt_c_over_cdt.htm">C/C++ Development perspective</a></p>
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<br>
<a href="cdt_o_brkpnts_watch.htm">Using breakpoints and watchpoints</a></p>
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