Instructions for Atom Setup on Mac: You may use Xcode instead of Atom. Atom is easier to use and has a cleaner UI. 1. Install Atom from https://atom.io * Make sure to drag Atom from your downloads to your Applications folder 2. Install Command Line Tools OR Xcode * Go to https://developer.apple.com/download/more/ * Search for the latest version of Command Line Tools for your version of MacOS * Install * OR: You may install Xcode from https://developer.apple.com/download/ * Xcode takes more space than Command Line Tools (Xtools has command line tools built into it) 3. In the settings tab for Atom, click Install a Packages and install the following: (Click the search tab, type the following, and click install.) * gpp-compiler * linter * linter-gcc * linter-ui-default * busy-signal * intentions * atom-python-run 4. RESTART ATOM and test code. To run your code, you must save your file as a .c file and hit fn-F5 on your keyboard.