Correctness of functional programs

The goals of this chapter are: What are your initial questions? Should I analyse the specification carefully, as in black-box testing, to discover “what the code should be doing”? Does white-box testing have an advantage, over black-box testing, in testing “what the program is not intended to do”? Should I carefully test interfaces, exceptions, or error returns, or should I concentrate on confirming the correctness of functional “internal” behaviour?

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This section addresses the question of program correctness functional programming. We visit the question of how to prove a program conect for the special case when it is written in a pure functional program-one that is state-less and relies instead on functional composition and recursion as a foundation for its semantics.

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After you have read and studied this chapter, you should be able to: Declare and manipulate data of the char data type; write string processing program, applicable in areas such as bioinformatics, using String, StringBuilder, and StringBuffer objects; differentiate the three string classes and use the correct class for a given task; specify regular expressions for searching a pattern in a string; use the Pattern and Matcher classes; compare the String objects correctly.

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Chapter 18 - Program correctness. This chapter provides knowledge of axiomatic semantics. This chapter includes contents: Fundamental concepts, the assignment rule, rules of consequence, correctness of the max function, correctness of programs with loops.

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Chapter 18b - Formal Methods Tools: JML. In this section, we introduce the features of JML as they apply to the formal specification and verification of an individual function, such as the Factorial function that we specified and verified by hand in the previous section. We also show how JML allows us to specify run-time exceptions, providing a more robust vehicle than the pure Hoare triples in a real computational setting where exceptions actually occur.

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Chapter 18d - Correctness of functional programs. This section addresses the question of program correctness functional programming. We visit the question of how to prove a program conect for the special case when it is written in a pure functional program-one that is state-less and relies instead on functional composition and recursion as a foundation for its semantics.

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When we program, we have to deal with errors. Our most basic aim is correctness, but we must deal with incomplete problem specifications, incomplete programs, and our own errors. Here, we’ll concentrate on a key area: how to deal with unexpected function arguments. We’ll also discuss techniques for finding errors in programs: debugging and testing.

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This lecture is an introduction to the design and testing of program units (such as functions and classes) for correctness. We discuss the use of interfaces and the selection of tests to run against them. This chapter emphasize the importance of designing systems to simplify testing and testing from the start. Proving programs correct and performance problems are also briefly considered.

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Three-dimensional models can be made accurately enough by RP methods to evaluate the design process and eliminate interference fits or dimensioning errors before production tooling is ordered. If design flaws or omissions are discovered, changes can be made in the source CAD program and a replacement model can be produced quickly to verify that the corrections or improvements have been made. Finished models are useful in evaluations of the form, fit, and function of the product design and for organizing the necessary tooling, manufacturing, or even casting processes....

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In computing, a hash table (also hash map) is a data structure used to implement an associative array, a structure that can map keys to values. A hash table uses a hash function to compute an index into an array of buckets or slots, from which the correct value can be found.

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This paper describes a COMIT program that proves the validity of logical arguments expressed in a restricted form of ordinary English. Some special features include its ability to translate an input argument into logical notation in four progressively refined ways, of which the first pertains to propositional logic and the last three to first-order functional logic; and its ability in many cases to select the "correct" logical translation of an argument, i.e., the translation that yields the simplest proof....

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he Design of Functional Programs - A Calculational ApproachAuthor : Dr. Robert Richard Hoogerwoord, Distributed Systems Group, Technische Universiteit EindhovenPublication Date : 1989 This document was suggested by John PintoDocument Excerpts:It is well-known that there is only one way to establish the correctness of a computer program, namely by rigorous mathematical proof. Acceptance of this f......

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Beginning Object-Oriented Programming with VB 2005 is a comprehensive resource of correct coding procedures. Author Daniel Clark takes you through all the stages of a programming project, including analysis, modeling, and development, all using object-oriented programming techniques and Visual Basic .NET. Clark explores the structure of classes and their hierarchies, as well as inheritance and interfaces. He also introduces the .NET Framework and the Visual Studio integrated development environment, or IDE. A real-world case study walks you through the design of a solution.

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Explain the basic purpose of a spreadsheet program. Identify the various components of the Excel screen. Navigate the Excel worksheet (entering, correcting, and moving data within the worksheet). Explain the purpose and usage of Excel’s built-in functions and macro functions.

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