CPS 104 (Ramm)
                     Fall Semester 1995
                   Homework Assignment #1


Due Friday, Sep. 8

This assignment should be done by hand.  You may turn in a
handwritten paper version or e-mail me a version created
with an editor.

The notes on the hypothetical machine discussed in class
include two simple programs.  Modify the second (looping)
program to alternately add and subtract items  in a list of
numbers (i.e. add, the first, subtract the second add the
third, subtract the fourth, etc.).  Have the program quit on
encountering a 0 in the data rather than using a count.
Double the length of the list of numbers to be used.  Make
up your own test data.

Write a revised program listing with machine language, just
like the handout.  Do a trace similar to the other handout.
However, take it through the loop only twice.


Optional

Propose a mechanism for implementing subroutines.  Do so
without requiring any new hardware.  (This may require some
fairly awkward conventions.)


Notes on Homework

Programs should include comments at the beginning that
include your name and the date that the program was
completed.  There should be a comment describing, briefly,
what the program is supposed to do.



















                      August 31, 1995