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An Introduction to Clascal Susan Keohan nacintoshUser Education Apple Co.puter, Inc. Preface This is a conceptual introduction to ClascaL not a reference manual. Example programs and syntax diagrams follow the text. The purpose of this document is to introduce experienced Pascal programmers to the concepts necessary to make the transition from a traditional procedure-oriented environment to Clascal's . object-oriented environment. This document assumes you are familiar with Lisa Pascal and QuickDraw. All programs and program fragments are boldface in this document. for example, thisShape.Erase is a program fragment. Table of Contents Introduction ... . 1 Comparing Pascal and Clascal 1 Pascal.