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An instruction of the form x = y in three address code uses

  • A.four addresses, since the operator itself counts as one
  • B.no addresses at all, since nothing is being computed
  • C.fewer than three addresses, which the form permits
  • D.exactly three addresses with one of them left unnamed

Answer: C

The limit is an upper bound rather than a requirement. Copies use two addresses, unconditional jumps one, and only binary operations use the full three, so the name describes the widest instruction rather than every instruction in the set.

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