1) Print the first line of the file.

2) Print the third line from a file.  

3) Print the 20th (you must use a loop!).

4) Count how many lines.  

5) Assume it's a list of numbers.  How many in the range 10,20?

6) Find the mean. 

7) Tell me if the file was already in order.  This can be done without an array.

8) Print the file in reverse order (I'd use an array, or super clever recursion.)