How to import and export a angular service

i followed the example for using the controller in my angular js app but i am having problem while using a service that is in a different file into a controller. How can i do this with an

The issue mentions an AngularJS controller and a service in a different file, but names no repository files or tests. Start by locating the controller example and the related service usage in the project. Done means documenting the import and export steps clearly enough to use the service from the controller.

Written by the indexing model from the issue text.