Make me a program that can read a file consisting of one number per line
and tell me several things about the file.  The file might have any
number of numbers, but not more than 1000.

Any data point below zero should be ignored!

Tell me:

1) Mean 
2) Median
3) Max
4) Min


How to do this:
a) Read the file.  For each number, if it's non-negative put it 
in the array.
b) Sort the array USING THE ALGORITHM FROM CLASS.
c) Sum the array.
d) Print the answers.

Note:  If there are an even number of numbers, the median is
the smaller of the two choices.  For example, if the data
consists of 1,2,-1,3,-1,4 the median is 2.

Due:  Mon Sep 25th.

Grading:  One point for each item above, 1-4.