Computer Science 481/681
                                     Program 5a
                                   Complete by  Oct 4

This program will not be graded  but I will be UNWILLING to help
you on program P5 until you can demonstrate a correct version of
program p5a.

Your mission here is to complete the "infrastructure" needed to
support incorporating image warps into the viewer.  This will be
done in two steps.  Step 1 should be complete by Oct 4.

Step 1 - Complete the functions that are missing bodies in vector.h.
When you are done, you should be able to make vectest with no
errors or warning messages and vectest should produce the output
found in vectest.out.

ONLY AFTER STEP 1 is WORKING


Step 2 - Complete the functions that are missing bodies in box.c
When you are done, you should be able to make boxtest with no
errors or warning messages and boxtest should produce the output
found in boxtest.out.

Supporting code is in the p5 directory.  You will need to supply
your own image.h and imagehdrs.h


-------------------- READ THIS -------------------------------
For this program the ONLY authorized sources of code is the code
in the p5a  directory and code you have created with the KEYBOARD.
Electronic exchange of code and/or screen scraping of code from
other sources is explicitly prohibited.

You are free to discuss the problem with other members of the
class, describe problems you are having to other members of the
class, and offer verbal solutions, but you are NOT ALLOWED to
VIEW the program of other class members for any reason ---
looking at someone's code is explicitly FORBIDDEN regardless of
whether the intent is to help them solve a problem or to help
YOU solve your problem. This rule is equally applicable to
electronic and hard copy.

You are responsible for protecting your own code.  If I should
receive duplicate code,  all parties involved will receive the
SAME PENALTY regardless of who actually wrote the code.

If you are stuck on a programming problem, you are encouraged
to contact Dr. Westall by e-mail. Such email should contain:

1 - A description of the problem you think you are having
    (e.g. I am getting a segfault when I call fread() to read
    the pixel data.
2 - The name of any input file and value of any input parameters
    (so that I can reproduce what you are doing)
3 - An attached .tar file that contains your code and input data

To create a tar file:

   Assume code in directory /home/student/class/481/p5a
   (1) cd /home/student/class/481/p5a
   (2) tar cvf ../me.tar .
   (3) the me.tar file you need to send will be created in the
       parent directory
  --------------- BE CAREFUL WITH tar --------------------
  Enter the command exactly as shown above.
  A common error is to think I remember and do something like
      tar cvf *
  This will DESTROY the alphabetically first file in your directory!!

--------------------READ THIS TOO -------------------------------

Adhere to the following programming standards.  Violations will
lead to deductions.

(1) no function should be longer than 20 lines code + whitespace.
(2) the maximum nesting level in any function is TWO
(3) code lines should not extend beyond column 72
(4) no more that one statement may be written on a single line
(5) use reasonably descriptive names for variables and functions
(6) your program should compile without any warnings with gcc -Wall
(7) indenting should be consistent with logical nesting
(8) diagnostic / debug prints should be disabled/deleted in
    your submission.