CSci 3102  Extension
Winter 1994
Homework 1  DUE 19 Jan.

The program that you will submit will draw a path between two points
on the terminal screen.  After prompting for two sets of points that
represent the starting and destination location you will print the
path from the source to the destination.

Your program will prompt the user for four points representing the
source and destination points in the form "sourcex sourcey destx
desty".  The program will terminate when a negative number is input
for any of the four above integers.  After reading the input and
checking for the negative number, you will print to the screen a map
of size 80 columns by 24 rows.  The map must contain the following
information:

Path: For the pair of source and destination points you will output
the path between them, using the character "-" to indicate horizontal
movement and the character "|" to indicate vertical movement.  For
this lab you are required to compute a path with only vertical and
horizontal movement, you don't need to compute diagonal or "as the
crow flies" paths.  There are two possible paths for each pair
(ie. horizontal then vertical or vertical then horizontal).  The
program only needs to do one path. 

Mark the source point with an 'S' and the destination point with a 'D'.
  
You may assume that the first point given is above and to the left of
the second point; that is, sourcex < destx and sourcey < desty.