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Bottom up parsing is described as shift reduce parsing because

  • A.the parser alternates strictly between shifting and reducing
  • B.every shift must be followed immediately by a reduction
  • C.the number of shifts always equals the number of reductions
  • D.those are the only two actions that advance the parse

Answer: D

The parser may shift several times in a row or reduce several times in a row. There is no required alternation, and the counts of the two actions are generally different. The shift count equals the token count while the reduction count does not.

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