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<title>Adding watchpoints</title>
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<h1>Adding watchpoints</h1>
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<p>A watchpoint is a special breakpoint that stops the execution of an
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application whenever the value of a given expression changes, without specifying
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where this may happen. Unlike breakpoints which are line-specific watchpoints
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are associated with files. They take effect whenever a specified condition is
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true regardless of when or where it occurred.</p>
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<p>To add a watchpoint:</p>
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<ol>
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<li>Click <b>Run > Add C/C++ Watchpoint</b>.</li>
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<ol>
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<li>If <b>Add C/C++ Watchpoint</b> is not listed on the Run menu, select <b>Window
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> Customize Perspective</b>.</li><li>In the Customize Perspective dialog
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box, expand <b>Other</b> in the <b>Available Items</b> list.</li><li>Select the <b>C/C++ Debug</b> check box. Click <b>OK</b>.</li>
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</ol>
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<li>In the <b>Add C/C++ Watchpoint</b> dialog box, type an expression in the <b>Expression to watch</b>
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box. The
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expression may be anything that can be evaluated inside an <samp>if</samp>
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statement.</li>
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<li>Do any of the following:</li>
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<ul><li>To stop execution when the watch expression is read, select the
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<b>Read</b> check box.</li>
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<li>To stop execution when the watch expression is written to, select the <b>Write</b>
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check box.</li></ul>
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<li>In the C/C++ editor, open the file that you added the watchpoint to.</li>
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<li>Click <b>OK</b>.</li>
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<li>The watchpoint appears in the <b>Breakpoints</b> view
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list.</li>
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</ol>
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<p><img border="0" src="../images/ngconcepts.gif" ALT="Related concepts" width="143" height="21">
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<br>
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<a href="../concepts/cdt_c_over_cdt.htm">C/C++ Development perspective</a><br>
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<a href="../concepts/cdt_o_projects.htm">Projects</a></p>
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<p><img border="0" src="../images/ngtasks.gif" ALT="Related tasks" width="143" height="21">
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<br>
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<a href="cdt_o_brkpnts_watch.htm">Working with breakpoints and watchpoints</a></p>
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<p><img border="0" src="../images/ngref.gif" ALT="Related reference" width="143" height="21">
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<br>
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<a href="../reference/cdt_o_run_dbg_pages.htm">Run and Debug dialog box</a></p>
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