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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 it might occur. 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. 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>
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<p>To set a watchpoint on a global variable:</p>
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<ol>
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<li>Highlight the variable in the editor, or select it in the Outline view.</li>
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<li>Click <b>Run > Toggle Watchpoint</b>.</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>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></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">Using 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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