Know how to use command-line arguments - both if you're calling a program or implementation a program.

Know how to perform I/O:
	Reading from the keyboard
	Printing to the screen
	Reading from a well-formated file
	Writing to a file
	Reading from a file of unknown length

variable declaration:
At this point, you know how to declare and use many different kinds of variables
You should know the scope and lifetime of each variable kind, how to 
declare them, and when they are appropriate.

	global variable
	local variable
	dynamically-allocated variable
	static variable