To install C/C++ with Eclipse, we recommend the CDT plugin. The best way to install CDT is from within Eclipse (follow the Help:Install New Software menu option). A useful set of instructions for doing this is here. On both Mac and PC, you must install a C/C++ compiler and associated utilities. If you are using a Mac, with an Apple ID you can download the command line tools package from the Apple Developer site. If you are on a PC, you must install either MinGW or Cygwin.
If you find any additional interesting links that you think would be valuable for other students, please email the instructor.