By Rudolf Marty (auth.)
This file introduces the programming method PISA intendei for the interactive construction of program software program. the guts of the programming method is a brand new programming language, also referred to as PISA. An interactive atmosphere for this language allows the construction, try out, upkeep, and utilization of PISA courses in a real-time discussion type. either the programming language and its interactive surroundings are defined with none connection with a selected implementation. jointly, they shape a good outlined programming method whose parts engage harmoniously. The programming procedure PISA is devoted to software software program creation. this suggests that creation of process software program and online-control courses isn't a target of PISA. moreover, it implies that PISA needs to meet a number of specifications as they come up from advertisement software software program creation, the main stringent ones being economic climate, availability, and compatibility: within the long-term the final price of software program creation and utilization with the sort of programming process needs to be under with traditional skill, the programming process has to be to be had or implementable on a variety of desktops at the moment used, and current info needs to be available in its real actual illustration. The definition of PISA is given in a seriously annotated shape during this document: Examples for using unmarried componer.ts in addition to for the full process are awarded, many of the lan~uage constructs and procedure amenities are commented on in brief, and the results of the programming system's layout on implementability and portability concerns are discussed.
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Additional info for PISA: A Programming System for Interactive Production of Application Software
The function r rounds the value of its actual parameter to the accuracy given by the actual parameter's type: - a t~! value is rounded to as many decimal fractional digits as given by the actual parameter's type. 2~1 value is rounded to as many decimal mantissa digits as given by the actual parameter's type. , the function r returns the value of the constant. If a type's internal representation maintains exactly as many decimal digits as the type definition specifies, the function r is redundant for this type.
1. Discrete types Variables and constants of a discrete type may only assume the discrete values introduced in their type's definition. A discrete type is either an enumerated type or a subrange type. discrete_type ::= enum_type I subrange_type An enumerated type defines an ordered set of discrete values by enumeration of the identifiers which denote these values. They are declared as £Qn21~n1~ of this type within the current block, where they may not be used for any other purpose. An enumerated type is its own ~22!
An end-of-line illegally terminates the literal string. are enclosed in comment brackets (* and *) and may contain any sequence of characters available on the implementation except the sequence *) which is used to terminate a comment. A comment may cross the boundaries of an arbitrary number of program text lines. 5. Termination of syntactic units PISA program text consists of a sequence of declarations and statements. Each statement and declaration is composed of one or more syntactic units. g.