# Comments

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`

### Comment

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).

### Uncomment

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.

Content Assist and code completion

Customizing the C++ editor
Commenting out code

C/C++ editor preferences