VB选择结构的分析与教学

The Analysis and Teaching of VB Selection Structure

选择结构是程序代码的重要组成部分,多分支是其本质特征,其供选择的各个条件具有不同的优先级,分支的选定具有唯一性。要提高VB选择结构的教学质量,教师就要给学生完整准确的基本概念,用＂设置断点,逐句跟踪＂的办法给学生展示运行过程,引导学生理解代码,以多行If选择结构为纲展开教学。

The selection structure is an important part of the program code, and multiple branches is its essential character. The conditions for the various options have different priorities, and final selected branch is unique. In order to improve the quality of teaching of VB choice structure, the paper proposes teachers should focus on teaching students basic concepts with integrity and accuracy, use the approach of ＂setting breakpoints, step by step tracking＂ to show students the operation, guide students to understand the code,and use this selection structure, which contains the ＂if＂ and multi-line statements; as a key to start teaching.