Concepts Of Programming Languages
Concepts Of Programming Languages
12th Edition
ISBN: 9780134997186
Author: Sebesta, Robert W.
Publisher: Pearson,
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Chapter 3, Problem 19RQ

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Two necessary things for a language entity to make denotational description:

For constructing a denotational semantics description in any language requires one to must define two things, namely,

  • A mathematical object, as they are uniquely defined so that they model the exact meaning of their respective entities.
  • A function that can be used to map with mathematical object, mapping is done with the instances of language entity onto instances of mathematical object...

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We are considering the RSA encryption scheme. The involved numbers are small, so the communication is insecure.  Alice's public key (n,public_key) is (247,7). A code breaker manages to factories  247 = 13 x 19  Determine Alice's secret key. To solve the problem, you need not use the extended Euclid algorithm, but you may assume that her private key is one of the following numbers 31,35,55,59,77,89.
Consider the following Turing Machine (TM). Does the TM halt if it begins on the empty tape? If it halts, after how many steps? Does the TM halt if it begins on a tape that contains a single letter A followed by blanks? Justify your answer.
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