📚 Mastering Programming for Edexcel A-Level Computer Science | Edexcel A-Level 计算机科学编程精讲
Programming is the core problem-solving skill in Edexcel A-Level Computer Science. Whether you are tracing pseudocode in Paper 1 or building a coursework project, a secure grasp of constructs, data structures, algorithms and testing will directly determine your marks.
编程是 Edexcel A-Level 计算机科学的核心问题解决技能。无论你是在 Paper 1 中追踪伪代码，还是在课程项目中构建程序，对结构、数据结构、算法和测试的扎实掌握都会直接影响你的得分。
1. Programming Fundamentals | 编程基础
Every Edexcel A-Level programming answer depends on three building blocks: sequence, selection and iteration. Sequence means instructions execute one after another; selection uses IF...THEN...ELSE...ENDIF or CASE statements; iteration is implemented with FOR, WHILE or REPEAT...UNTIL loops.
每个 Edexcel A-Level 编程答案都依赖三个基本结构：顺序、选择和迭代。顺序是指令按顺序执行；选择使用 IF...THEN...ELSE...ENDIF 或 CASE 语句；迭代通过 FOR、WHILE 或 REPEAT...UNTIL 循环实现。
Use constants for fixed values so programs are easier to maintain, and choose meaningful variable names such as totalScore rather than ts. Comments should explain why a complex step exists, not simply repeat the code.
对固定值使用常量，程序更易于维护；变量名要选择有意义的名字，如 totalScore 而不是 ts。注释应当解释复杂步骤存在的原因，而不是简单重复代码。
In Edexcel pseudocode, assignment is written with the left arrow ←. For example, total ← total + mark updates a running total by adding the current mark.
在 Edexcel 伪代码中，赋值使用左箭头 ←。例如，total ← total + mark 通过加上当前分数更新累计总分。
2. Data Types and Structures | 数据类型与结构
Edexcel pseudocode uses integer, real, char, string and Boolean data types. Integer arithmetic truncates division results, while real arithmetic keeps the fractional part.
Edexcel 伪代码使用整数、实数、字符、字符串和布尔数据类型。整数算术会截断除法结果，而实数算术保留小数部分。
| Data Type | Example | Typical Use |
|---|---|---|
| Integer | 5, -12 | Counters, whole-number arithmetic |
| Real | 3.14, -0.5 | Decimal values, averages, scientific calculations |
| Char | 'A', '7' | Single character input or output |
| String | "hello" | Names, messages, text
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