Arrange the following stages of a Turing Machine (TM) operation in the correct…
2024
Arrange the following stages of a Turing Machine (TM) operation in the correct order as they occur during computation.
(A) Writing a symbol on the tape
(B) Moving the tape head left to right
(C) Reading a symbol from the tape
(D) Transitioning to a new state based on the current state and symbol read
(E) Halting and accepting or rejecting the input
Choose the correct answer from the options given below:
- A.
(C), (A), (B), (D), (E)
- B.
(C), (B), (A), (D), (E)
- C.
(C), (D), (A), (B), (E)
- D.
(C), (D), (B), (A), (E)
Attempted by 74 students.
Show answer & explanation
Correct answer: C
Correct order and explanation:
Read the current tape symbol.
Transition to a new state based on the current state and the symbol just read; this chosen transition also specifies what symbol to write and which direction to move the head.
Write the specified symbol on the tape.
Move the tape head one cell left or right as specified by the transition.
If a halting state is reached, halt and accept or reject; otherwise repeat the cycle starting with reading the current symbol.
Key point: The transition is selected after reading and before writing/moving because it determines both the symbol to write and the direction of the move.
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