Here is how you install cdt plugin in Eclipse:
Use the following URL in a Site Bookmark in the update manager:
To install CDT from the update site, in the Help menu select Software Updates and then Find and Install, Select Search for new features to install and click Next. Click New Remote Site to add an update with the URL provided above, and then expand the site node to reveal the available downloads.
There're other ways to install it, but the above is the easiest. Once installed, you should be able to create C++ projects with Eclipse. You can find anything you need to know here: