Tell the class which language you chose and anything that’s special about it.
Remind the class of the task that is the focus of your presentation.
Run the test harnesses and/or unit tests as appropriate to illustrate the problem(s) we found.
Present the code in a top-down fashion. Explain your language as you go.
Be prepared to respond to questions by the class as admitted by the instructor.
Top-Down means that you explain how you organized your Program to solve the problem and for each function/class+method, you follow the design recipe to explain its purpose. Start with the main function/class and work your way to less important functions/classes+methods from there.