Edexcel A Level Programming: Algorithms, Data Structures and Computational Thinking | Edexcel A Level 编程：算法、数据结构与计算思维

📚 Edexcel A Level Programming: Algorithms, Data Structures and Computational Thinking | Edexcel A Level 编程：算法、数据结构与计算思维

Welcome to this Edexcel A Level Computer Science revision guide on programming. Programming questions appear in both Paper 1 and Paper 2, often through pseudocode tracing, algorithm design, and coding scenarios. The key to high marks is not just knowing syntax, but being able to analyse a problem, choose an appropriate data structure, and justify efficiency.

欢迎阅读本 Edexcel A Level 计算机科学编程复习指南。编程题在 Paper 1 和 Paper 2 中都会出现，通常以伪代码追踪、算法设计和编码情景题的形式考查。获得高分的关键不只是掌握语法，还要能够分析问题、选择合适的数据结构，并论证算法效率。

1. Programming Fundamentals and Flow of Control | 编程基础与控制流

Every algorithm can be built from sequence, selection, and iteration. Sequence executes statements in order; selection makes a decision based on a condition; iteration repeats a block while or until a condition changes.

每个算法都可以由顺序、选择和迭代三种结构构建。顺序按先后顺序执行语句；选择根据条件作出判断；迭代在某个条件成立或改变之前重复执行一段代码。

In Edexcel pseudocode, selection often uses IF…THEN…ELSE…ENDIF. Iteration can be count-controlled with FOR i ← 0 TO n – 1 or condition-controlled with WHILE…DO…ENDWHILE and REPEAT…UNTIL.

在 Edexcel 伪代码中，选择通常使用 IF…THEN…ELSE…ENDIF。迭代可以是计数控制的 FOR i ← 0 TO n – 1，也可以是条件控制的 WHILE…DO…ENDWHILE 和 REPEAT…UNTIL。

Use the Edexcel pseudocode conventions: the left arrow ← indicates assignment, = is comparison, and MOD/DIV are used for integer remainder and quotient. Write clearly and indent loops and selection blocks.

请使用 Edexcel 伪代码约定：左箭头 ← 表示赋值，= 用于比较，MOD 和 DIV 分别表示整数余数和商。书写

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