.
     CSE 109    HW 5     Due   9 PM  Tuesday 22 April 2008

     This homework is an exercise in writing simple C programs.  Write
     a well modularized program (i.e., that makes good use of function
     calls and) that assumes each line of input from the screen, except the
     last, consists of exactly two entries, an int followed by a double.
     The program should store the contents of the lines in an array of
     structs, sort the structs, using the int as a key, and then displays
     the sorted list. A negative int should be used as a sentinel for
     the list.

     Store the program in the file "hw5.c". You should compile the program
     using the -xc option. To test your program I will compile it with
     the command
        gcc -xc hw5.c

     To submit your homework, create a subdirectory of csc109.081 called
     hw5 (that is, from your root directory /csc109.081/hw5).  The
     subdirectory hw5 should only contain the file hw5.c.

     NOTE: This homework (like all homeworks) will only be collected once
     (unlike programming assignments, for which there were be multiple
     opportunities to submit your solution).

     NOTE: To read a double with scanf, you need to have an l(ell) after
     the %, e.g., scanf(" %lf", &d).
                           ^-------------- The letter ell

     NOTE: In the documentation for the program, include the name of
     your partner.

     NOTE: A well-modularized program in this case should have a main()
     that declares the variable(s) and then makes a few function calls
     to accomplish your task. Don't shy way from the function calls.
     Writing them is part of the task.

     NOTE: To make life easier, create a test file with some data, say
     "testFile". Then, if the executable file is "hw5", you can write
         hw5 < testFile
     and the program will read from "testFile" rather than the screen.