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Eclipse C/C++ Developer Guide
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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:

  • /* text */
  • // text


You can quickly comment out one or more lines of code by inserting the leading characters // at the beginning of the line. To do so, select the line (or lines) of code you want to comment out and press CTRL+/ (slash).


To uncomment select the line (or lines) of code, and press CTRL+\ (backslash).

Tip: The characters /* */ on lines that are already commented out, are not affected when you comment and uncomment code.

Multiline comment

You can use the Content Assist feature to insert a multi-line comment before a function. Type com+Ctrl+Space, and the following code is entered at the cursor location:

 * author userid
 * To change this generated comment edit the template variable "comment":
 * Window > Preferences > C/C++ > Editor > Templates.
To change the default comment click Window > Preferences > C > Templates. For more information see the Content Assist section.

Related concepts
Content Assist and code completion

Related tasks
Customizing the C++ editor
Commenting out code

Related reference
C/C++ editor preferences

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