解释程序代码:给学生答案是有帮助的——但仅仅是一点点

Simon, S. Snowdon
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引用次数: 25

摘要

在通过编程入门课程的学生中,许多人似乎无法解释简单代码片段(如查找数组中最大元素的循环)的目的。这是因为学生无法确定代码的目的,还是因为他们可以确定目的,但缺乏表达目的的能力,这一点从未得到证实。本研究通过比较几门编程入门课程中学生的答案来探讨这个问题。在早期的课程中,学生们被要求用自己的话表达目的;在后来的实验中,他们被要求从多项选择题中的几个选项中选择目的。在海外大学,学生们在多项选择题上的表现明显更好;在国内的校园里,表现更好,但不是很明显。当给出一小段代码的目的和一些替代方法时,许多学生无法识别出代码的正确目的。结论是,学生在代码解释问题中表现不佳并不是因为他们无法表达代码的目的,而是因为他们确实无法确定代码的目的——甚至无法从一个简短的列表中识别它。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Explaining program code: giving students the answer helps - but only just
Of the students who pass introductory programming courses, many appear unable to explain the purpose of simple code fragments such as a loop to find the greatest element in an array. It has never been established whether this is because the students are unable to determine the purpose of the code or because they can determine the purpose but lack the ability to express that purpose. This study explores that question by comparing the answers of students in several offerings of an introductory programming course. In the earlier offerings students were asked to express the purpose in their own words; in the later offerings they were asked to choose the purpose from several options in a multiple-choice question. At an overseas campus, students performed significantly better on the multiple-choice version of the question; at a domestic campus, performance was better, but not significantly so. Many students were unable to identify the correct purpose of small fragments of code when given that purpose and some alternatives. The conclusion is that students' failure to perform well in code-explaining questions is not because they cannot express the purpose of the code, but because they are truly unable to determine the purpose of the code - or even to recognize it from a short list.
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