This book is concerned with language skills and language understanding rather than programming methodology. No mention is made of testing, and no attention given to the environment in which programs must be entered, or executed. It is assumed that a reader will be familiar with these matters.
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Providing the essential tools and techniques of computer science, this textbook contains in-depth coverage of design principles, featuring assertions, preconditions, postconditions and loop variants. Procedures are presented early, and include parameter passage and scope of variables.
This second edition has been thoroughly updated to instruct readers on the design of fast and flexible file structures. It includes coverage of file structures in a UNIX environment, in addition to a new and substantial appendix on CD-ROM. Other modern file structures such as extendible hashing methods are also explored. This book develops a framework for approaching the design of systems to store and retrieve information on magnetic disks and other mass storage devices. It provides a fundamental collection of tools that any user needs in order to design intelligent, cost-effective, and appropriate solutions to file structure problems.
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The design of this book is based on teaching the ]SP (Jackson Structured Pro gramming) methodology to undergaduates and postgraduates over a period of a number of years. I am grateful for the comments and feedback that have been provided by students who have taken these courses. The aim of the book is to provide readers with an understanding of the concepts behind the ]SP methodology in order that they may apply it for themselves; simply using the notation is not sufficient, it must be used appropriately. The answer to the question "Why is this wrong?" can lead to a greater understanding than a sim ple response to "Is this right?". I have included illegal structures as "under standable mistakes" in the early sections for this reason. It is not necessary for readers of this text to have experience with any par ticular programming language; indeed, one of the virtues of ]SP is that it is lan guage independent. Examples have been given in Pascal, C and COBOL as these are languages which students of ]SP are likely to have met in the course of their studies, or will be meeting while they are learning ]SP. The COBOL lan guage is widely used in industry in a ]SP development environment.
The third edition of this best-selling text has been revised to present a more problem oriented approach to learning Pascal, without substantially changing the original popular style of previous editions. With additional material on Turbo Pascal extensions to the standard Pascal, including binary files and graphics, it continues to provide an introduction which is as suitable for the programming novice as for those familiar with other computer languages.