1. A method of program development that makes extensive use of abstraction in order to factorize the problem and give increased confidence that the resulting program is correct. Given the specification of a required program, the first step is to envisage some “ideal” machine on which to implement that program. This ideal machine should offer both an appropriate set of data structures and an appropriate set of operations on those data structures. The required program is then defined as a program for the specified ideal machine.
By this means the original problem has been reduced to one of implementing the specified ideal machine, and this problem is itself tackled in the same way. A second ideal machine is envisaged, this machine being ideal for implementing the data structures and operations of the first machine, and programs are produced to effect the implementation. This process continues until eventually a level is reached at which the specified data structures and operations of the ideal machine can conveniently be implemented directly in the chosen programming language. Thus the eventual program is based upon “levels of abstract machine”, where the top-level machine is ideally suited to the specific application and the lowest-level machine directly executes the chosen programming language. The development process is not, however, simply one of “subroutinization”, since both operations and data structures are refined simultaneously at each level.
The overall method of structured programming, which is largely due to E. W. Dijkstra, is heavily influenced by a concern for program correctness. The intention is that at any level the implementation machine should be so well suited to the problem at hand that the programs for that machine will be small and simple. It should therefore be possible at each level to provide a convincing rigorous argument that the programs are correct.
2. (structured coding) An approach to coding in which only three constructs are employed for governing the flow of control through the program. These three constructs allow for sequential, conditional, and iterative control flow. Arbitrary transfer of control (i.e. the GOTO statement) is expressly forbidden. As a direct result, for each compound statement within the program there is precisely one entry point and one exit point, and reasoning about the program is thereby made easier.
"structured programming." A Dictionary of Computing. . Encyclopedia.com. (December 12, 2018). https://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/structured-programming
"structured programming." A Dictionary of Computing. . Retrieved December 12, 2018 from Encyclopedia.com: https://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/structured-programming
Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).
Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.
Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:
Modern Language Association
The Chicago Manual of Style
American Psychological Association
- Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
- In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.