<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html lang="en"> <head> <meta http-equiv="Content-Language" content="en-us"> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Comments</title> <link rel="stylesheet" type="text/css" href="../help.css"> </head> <body> <div role="main"> <h1>Comments</h1> <p>Comments are lines in a source file that have been marked to be ignored by the compiler. Two styles of comments are supported by current C/C++ compilers:</p> <ul> <li><samp>/* text */</samp></li> <li><samp>// text</samp></li> </ul> <h2>Comment</h2> <p>You can quickly comment out one or more lines of code by inserting the leading characters <samp>//</samp> at the beginning of the line. To do so, select the line (or lines) of code you want to comment out and press <strong>CTRL+/</strong> (slash).</p> <h2>Uncomment</h2> <p>To uncomment select the line (or lines) of code, and press <strong>CTRL+\</strong> (backslash). <p><strong>Tip:</strong> The characters <samp>/* */</samp> on lines that are already commented out, are not affected when you comment and uncomment code.</p> <h2>Multiline comment</h2> <p>You can use the Content Assist feature to insert a multi-line comment before a function. Type <span class="typewriter">com+Ctrl+Space</span>, and the following code is entered at the cursor location: <br><pre> /* * author userid * * To change this generated comment edit the template variable "comment": * Window > Preferences > C/C++ > Editor > Templates. */ </pre> To change the default comment click <strong>Window > Preferences > C > Templates</strong>. For more information see the <a href="cdt_c_content_assist.htm">Content Assist</a> section. <p><img src="../images/ngconcepts.gif" ALT="Related concepts" width="143" height="21"> <br> <a href="cdt_c_content_assist.htm">Content Assist and code completion</a></p> <p><img src="../images/ngtasks.gif" ALT="Related tasks" width="143" height="21"> <br> <a href="../tasks/cdt_t_cust_cpp_editor.htm">Customizing the C++ editor</a><br> <a href="../tasks/cdt_t_comment_out.htm">Commenting out code</a></p> <p><img src="../images/ngref.gif" ALT="Related reference" width="143" height="21"> <br> <a href="../reference/cdt_o_ceditor_pref.htm">C/C++ editor preferences</a></p> <p> <img src="../images/rh03_04.gif" ALT="Red Hat Copyright Statement"><br> <img src="../images/ng00_04a.gif" ALT=" IBM Copyright Statement" > </p> </div> </body> </html>