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“循环结构”是江苏省高中信息技术学业水平测试(选修为算法与程序设计)中的一个重点考点。近几年来的学业水平测试中经常出现利用双重循环打印图形的题型。阅读教材《算法与程序设计》(选修、教育科学出版社)可以发现,在讲解双重循环打印图形知识点时,教材仅列举了一个图形打印的例子,列出了代码,而并未就双重循环的具体涵义、代码执行流程及图形打印的一般编程规律等做详细的讲解归纳。因此,想仅仅通过此例来掌握双重循环的涵义和图形打印的一般方法,教材内容是远远不够的。这也就导致了学生在作答此类问题时,对双重循环的程序结构阅读不懂,不知如何下手答题。
“Cycle structure ” is a key test center in Jiangsu province high school information technology academic level test (elective algorithm and programming). In recent years, the academic level test often use the double loop printing graphics problems. Reading the text “Algorithms and Programming” (elective, Education Science Press) can be found in explaining the double loop printing graphics knowledge point, the text only enumerates a graphic print example, the code is listed, but did not double loop The specific meaning of the code execution process and graphics printing general programming rules do explain in detail. So, just by this example to grasp the meaning of double loop and the general method of graphic printing, textbook content is not enough. This also led students in answering such problems, the program structure of the double loop read do not understand, I do not know how to start the answer.