Computational thinking has been promoted in recent years as a skill that is as fundamental as being able to read, write, and do arithmetic. However, what computational thinking really means remains speculative. While wonders, discussions and debates will likely continue, this article provides some analysis aimed to further the understanding of the notion.It argues that computational thinking is likely a hybrid thinking paradigm that must accommodate different thinking modes in terms of the way each would influence what we do in computation. Furthermore, the article makes an attempt to define computational thinking and connect the (potential) thinking elements to the known thinking paradigms. Finally, the author discusses some implications of the analysis.

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Interface, as an object-oriented programming construct, has been one of the most difficult concepts for students to understand and apply properly. Textbooks often only address the shallow side of usefulness of interfaces, and some may even mislead as to when and how an interface should be used. This article argues that the interfaces can only be effectively taught in a context of program design. The material is appropriate to be included in a second course on programming.

Point v ortex ows of a steady, t wo dimensional, inviscid, and incompressible uid are studied for doubly connected geometries. The Routh function is explicitly constructed, and equilibrium con gurations of vortices are found by determining critical points numerically. The numerical computations make use of an analogue of the Schwarz-Christo el transformation for doubly connected regions.

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