CIS 252 — SPRING 2008

A Patch for Homework 1

Thompson, Exercise 2.4 (rephrased slightly)

How do you produce the following three pictures?

.......##...#######..###
.....##..#..#####..##.##
...##.....#.###..#####.#
..#.......#.##.#######.#
..#...#...#.##.###.###.#
..#...###.#.##.###...#.#
.#....#..##.#.####.##..#
..#...#.....##.###.#####
...#...#....###.###.####
....#..#....####.##.####
.....#.#....#####.#.####
......##....######..####
#######..###.......##...
#####..##.##.....##..#..
###..#####.#...##.....#.
##.#######.#..#.......#.
##.###.###.#..#...#...#.
##.###...#.#..#...###.#.
#.####.##..#.#....#..##.
##.###.#####..#...#.....
###.###.####...#...#....
####.##.####....#..#....
#####.#.####.....#.#....
######..####......##....

.......##...#######..###
.....##..#..#####..##.##
...##.....#.###..#####.#
..#.......#.##.#######.#
..#...#...#.##.###.###.#
..#...###.#.##.###...#.#
.#....#..##.#.####.##..#
..#...#.....##.###.#####
...#...#....###.###.####
....#..#....####.##.####
.....#.#....#####.#.####
......##....######..####
###..#######...##.......
##.##..#####..#..##.....
#.#####..###.#.....##...
#.#######.##.#.......#..
#.###.###.##.#...#...#..
#.#...###.##.#.###...#..
#..##.####.#.##..#....#.
#####.###.##.....#...#..
####.###.###....#...#...
####.##.####....#..#....
####.#.#####....#.#.....
####..######....##......

.......##...#######..###
.....##..#..#####..##.##
...##.....#.###..#####.#
..#.......#.##.#######.#
..#...#...#.##.###.###.#
..#...###.#.##.###...#.#
.#....#..##.#.####.##..#
..#...#.....##.###.#####
...#...#....###.###.####
....#..#....####.##.####
.....#.#....#####.#.####
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####.###.###....#...#...
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#.###.###.##.#...#...#..
#.#######.##.#.......#..
#.#####..###.#.....##...
##.##..#####..#..##.....
###..#######...##.......

Thompson, Exercise 2.5

Give another variant of the `horse' pictures in the previous question, and show how it could be created. Note: a nice variant is:

.......##...#######..###
.....##..#..#####..##.##
...##.....#.###..#####.#
..#.......#.##.#######.#
..#...#...#.##.###.###.#
..#...###.#.##.###...#.#
.#....#..##.#.####.##..#
..#...#.....##.###.#####
...#...#....###.###.####
....#..#....####.##.####
.....#.#....#####.#.####
......##....######..####
######..####......##....
#####.#.####.....#.#....
####.##.####....#..#....
###.###.####...#...#....
##.###.#####..#...#.....
#.####.##..#.#....#..##.
##.###...#.#..#...###.#.
##.###.###.#..#...#...#.
##.#######.#..#.......#.
###..#####.#...##.....#.
#####..##.##.....##..#..
#######..###.......##...

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