Constructing Complex Turing Machines

1
Constructing Complex Turing Machines
Idea Use a modular approach similar
to the one use to construct complex
programs
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Graphical Conventions
We will use a convention similar to a flow chart
to indicate how to put together Turing machines
(TMs).
A if a then B
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Graphical Conventions (2)
a
a
M If a then A else B
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Graphical Conventions (3)
a
while (not a) do A
a
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Basic Turing Machines
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Other Simple Turing Machines
What it does
Machine
a
if current cell has an a, then replace it with a
b
if current cell has a character a different than
?, then move once to the right and write that a
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The ?? Turing Machine

?

?

• What it does?

Move to the right until if finds