Review of Lab, Course overview

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Review of Lab, Course overview

• Formal Methods se304/cs407

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Yesterdays lab

• Module for student, admin
• The student class should have two subject fields
  (these are double honours students), a name
  field, a student number field, and the usual get
  and set methods. The admin class should create
  several student objects and print their contents
  to the screen.

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First step

• These are classes (Student and Admin)
• So they should be hidden sorts
• In CafeOBJ, attributes of classes are only
  described by the operators that describe their
  methods

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Student module

• module STUDENT
• Student

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• module STUDENT
• Student
• bop setStudentName Student String -gt Student

String
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• module STUDENT
• Student
• String
• bop setStudentName Student String -gt Student
• bop setStudentNumber Student Nat -gt Student

Nat
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• module STUDENT
• Student
• Nat String
• bop setStudentName Student String -gt Student
• bop setStudentNumber Student Nat -gt Student
• bop getStudentName Student -gt String
• bop getStudentName Student -gt String
• similarly for subject1 and subject 2

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Admin module

• module ADMIN
• Admin

protecting (STUDENT)
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Admin module

• module ADMIN
• protecting (STUDENT)
• Admin
• bop addStudent Admin String Nat String String
• -gt Admin
• bop printStudents Admin -gt Admin

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Course so far

• Introduction/motivation for formal methods
• The point is to build better software
• Remove ambiguity, incompleteness and
  inconsistency
• Design by Contract with JML
• Pre-conditions, post-conditions, invariant
• Quantifiers
• Testing
• Refinement

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Course so far

• CafeOBJ
• Introduction
• Imports, signatures, axioms
• Ambiguous terms
• Developing basic modules
• Examples Nat, GCD, Factorial
• Term rewriting systems
• Proof
• Hidden sorts

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Remaining lectures, labs

• Historical context, motivation for formal methods
• Revision lab
• Revision lectures
• Optional lab exam

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Main Exam

• Sample paper not ready
• Ill email the class once its on my webpage
• Cheat sheet
• Notes on web are not adequate
• Ask questions in next weeks lab
• Let me know if there are particular areas you
  want me to revise