The inclusion of data frames illustrating data flow in control structure charts for novice students

ACM-SE 28 Pub Date : 1990-04-01 DOI:10.1145/98949.99083
M. V. Doran, H. Longenecker
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Abstract

Studies [3], [5] have demonstrated the power of graphical versus textual presentations. Our postulate slates that graphical definition must include a graphical representation of the data structures used [1]. Current research addresses the representation issue, the goal being not only to visually present graphical control flows but also the data being transformed by those control structures. The initial problem solving course at the USA is designed to teach concepts of algorithm formation as a method of solving formal analytic problems. Algorithms are defined graphically in control structure charts using textual dictionaries of variables. With this method, data is visualized graphically as it flows through the al­ gorithm. Research has been undertaken to investigate the necessary components and features required to support the environment. This research is based on Law’s work [4] defining structure charts in the SLAW (Structure Language Algorithm Writer) environment. A graphical tree represents the control flow of the algorithm. Textual dictionaries define the data structures employed. The flow of control is indicated by a hierarchy of shapes. SLAW has successfully been used as a teaching tool [2]. The primary focus of this research is the generation and investigation of a method for algorithm develop­ ment, DATA (Data to Algorithm Translation Analysis), entirely free of any programming language syntax, has been developed to graphically represent data structures and flows which yield structure charts in the SLAW method of algorithm development. The user creates a structure chart. Multiple dictionaries are now defined, each using graphical iconic symbols. Each lask/action in the chart will have associated with it a dictionary bubble which will become active and expand into a data window at the execution or reference of the lask/action. The data windows allow the user to monitor the data flows.
为初学者在控制结构图中加入说明数据流的数据框
研究[3]、[5]已经证明了图形与文字展示的力量。我们认为,图形定义必须包括所用数据结构的图形表示[1]。目前的研究解决了表示问题,其目标不仅是直观地表示图形控制流,还包括由这些控制结构转换的数据。美国的初始问题解决课程旨在教授算法形成的概念,作为解决形式分析问题的一种方法。算法在控制结构图中以图形方式定义,并使用变量的文本字典。通过这种方法,数据在流经算法时以图形的方式可视化。已开展研究,调查支持环境所需的必要组件和功能。这项研究基于 Law 的工作[4],即在 SLAW(结构语言算法编写器)环境中定义结构图。图形树表示算法的控制流。文本字典定义了所使用的数据结构。控制流由图形的层次结构表示。SLAW 已成功用作教学工具[2]。本研究的主要重点是生成和研究一种算法开发方法,即 DATA(数据到算法转换分析),它完全不使用任何编程语言语法,以图形方式表示数据结构和流程,从而生成 SLAW 算法开发方法中的结构图。用户创建结构图。现在可以定义多个字典,每个字典都使用图形图标符号。图表中的每个任务/操作都会关联一个字典气泡,该气泡会在任务/操作执行或引用时激活并扩展为一个数据窗口。数据窗口允许用户监控数据流。
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