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clusters AND DIALOGS FOR SET implementationS

IEEE TRANSACTIONS ON SOFTWARE ENGINEERING 1979年第3期5卷 256-275页

作者： KATZENELSON, J Department of Electrical Engineering Technion Israel Institute of Technology

The main goal of the extensible set language (ESL) is to construct a translator for a set oriented extensible language which can produce efficient code. The ESL, now under development, uses clusters for extending the set oriented language and for mappimg the sets and their operators into base language data structure and operators. The main difficulty in this mapping is the dependency among clusters. The dialogue is a compile time procedure which is part of a cluster. It manipulates data structures and enables each cluster to appear independent. It also enables the user to chose one of a family of data implementations defined by the cluster. Thus the dialogue makes it possible for a data structure to appear as a building block which can be used simply and flexibly. ESL can be distinguished in several parts. One part, the set language (SL), is sublanguage of ESL in which the user writes his application. The ESL compiler gets an ESL program as input and produces a base a language (BL) program or output. The parts of ESL not covered by the union of SL and BL are mixed BL, Sl types, clusters and diagrams, and mappings.

关键词： Very High Level Languages Abstract data Types clusters for the implementation of data abstraction Dependency Among clusters Dialogues Efficient Code For Very High Level Languages Programming Languages Programming Methodology Set Languages

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An Experiment in Software Error data Collection and Analysis

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IEEE Transactions on Software Engineering 1979年第3期SE-5卷 276-286页

作者： Schneidewind, N.F. Hoffmann, Heinz-Michael Naval Postgraduate School Monterey CA. 93940 United States Federal German Navy Philipp-Lassen-Koppel 38 2390 Flensburg Germany United States

The propensity to make programming errors and the rates of error detection and correction are dependent on program complexity. Knowledge of these relationships can be used to avoid error-prone structures in software design and to devise a testing strategy which is based on anticipated difficulty of error detection and correction. An experiment in software error data collection and analysis was conducted in order to study these relationships under conditions where the error data could be carefully defined and collected. Several complexity measures which can be defined in terms of the directed graph representation of a program, such as cyclomatic number, were analyzed with respect to the following error characteristics: errors found, time between error detections, and error correction time. Signifiant relationships were found between complexity measures and error charateristics. The meaning of directed graph structural properties in terms of the complexity of the programming and testing tasks was examined. Copyright © 1979 by The Institute of Electrical and Electronics Engineers, Inc.

关键词： clusters for the implementation of data abstraction dependency among clusters dialogues efficient code for very high level languages Index Terms-Abstract data types programming languages programming methodology set languages very high level languages

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