Textbook errors in binary searching

  • Authors:
  • Richard E. Pattis

  • Affiliations:
  • Univ. of Washington, Seattle

  • Venue:
  • SIGCSE '88 Proceedings of the nineteenth SIGCSE technical symposium on Computer science education
  • Year:
  • 1988

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Abstract

This paper discusses the specification and implementation of binary searching. It begins by presenting a “standard” set of declarations, a specification, and a binary searching procedure written in Pascal. This procedure does not meet the specification: it contains five errors that also occur in many CS-1 and CS-2 textbooks. We will locate and study these errors, and show alternative procedures that correct them in a simple and understandable way.