The CDT stands for "C/C++ Development Tools." The CDT is an Eclipse plugin that allows you work with C and C++ projects. The CDT homepage is http://www.eclipse.org/cdt/.
Inside Eclipse, go to Help -> Software Updates -> Find and Install.
Select Search for new features to install and click Next.
Check Europa Discovery Site and click Finish.
You will be prompted to select a mirror more than once during the installation process. Indiana University tends to be fast. Click OK.
Expand "Europa Discover Site" by clicking the + sign and check C and C++ Development. Click Next.
Select I accept the terms in the license agreement and click Next.
Click Finish.
Click Install All.
Click Yes when prompted to restart Eclipse.
When Eclipse restarts, go to Window -> Preferences. On the left, expand C/C++ -> Code style. Click New.
Type a name for your new code formatter profile such as No tabs for CSE 12 and make sure the settings are being initialized from K&R [built-in]. Click OK.
In the Tab policy dropdown, select Spaces only and click Ok. Click Ok to close the Preferences dialog.
Installing MSYS