Figure
13-1.
Computer memory as sketch pad
holes or cells arranged in rows and columns, as Post Office boxes are.
Each cell of the array corresponds to a dot position on the paper (Fig-
ure
13-2).
Figure
13-2.
Array in memory and on paper
Although the cells in a numeric array can hold nearly any numeric
value, you use only the binary numbers
(0
and
1)
for this graphics
program. Figure
13-3
demonstrates using a
1
to represent a dot and a 0
to represent no dot.
174
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