Download Abstraction and specification in program development by Barbara Liskov, John V. Guttag PDF
By Barbara Liskov, John V. Guttag
Abstraction and Specification in software improvement bargains execs in application layout and software program engineering a technique that would permit them to build courses which are trustworthy and fairly effortless to appreciate, regulate, and hold. stable programming comprises the systematic mastery of complexity, and this booklet offers the 1st unified therapy of the thoughts of abstraction and specification, which, the authors argue, are the linchpin of any potent method of programming. They position specific emphasis at the use of knowledge abstraction to supply hugely modular courses. The authors specialise in the method of decomposing huge application tasks into autonomous modules that may be assigned to autonomous operating teams. They speak about tools of decomposition, the types of modules which are most precious during this technique, and strategies to extend the possibility that modules produced can in reality be recombined to unravel the unique programming challenge. there are various examples of abstractions in the course of the textual content, and every bankruptcy ends with pertinent references and routines. lots of the pattern implementations within the e-book are written in CLU, considered one of more and more languages in a position to aid information abstraction. enough fabric is incorporated, in spite of the fact that, to permit the reader to paintings in Pascal in addition. the fabric during this e-book used to be constructed through the authors in the course of a decade of training undergraduate, graduate, and professional-level classes. Barbara Liskov, the developer of CLU, is Professor and John Guttag an affiliate Professor of laptop technological know-how at MIT. Abstraction and Specification in software improvement is incorporated within the MIT electric Engineering and computing device technological know-how sequence.
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Extra resources for Abstraction and specification in program development
In option files, only the long form of an option is allowed. This is in contrast to command lines, where options often can be specified using a short form or a long form. For example, the hostname can be given using either -h hostname or -host=hostname on the command line; in an option file, only host=hostname is allowed. • Options often are used for connection parameters (such as host, user, and password). However, the file can specify options that have other purposes. The pager option shown for the [mysql] group specifies the paging program that mysql should use for displaying output in interactive mode.
This provides a convenient way to list general client parameters that you want all client programs to use, but still be able to specify options that apply only to a particular program. The preceding sample option file illustrates this convention for the mysql program, which gets general connection parameters from the [client] group and also picks up the no-auto-rehash and pager options from the [mysql] group. ) • If a parameter is specified multiple times in an option file, the last value found takes precedence.
6] --pager=program tells mysql to use a specific program as your pager:  The --pager option is not available under Windows. % mysql --pager=/usr/bin/less --pager by itself tells mysql to use your default pager, as specified in your PAGER environment variable: % mysql --pager If your PAGER variable isn't set, you must either define it or use the first form of the command to specify a pager program explicitly. 9 for setting environment variables. Within a mysql session, you can turn paging on and off using \P and \n.