📚 Edexcel A-Level Programming Essentials: Data, Control and Algorithms | Edexcel A-Level 编程核心：数据、控制与算法
Programming questions in Edexcel A-Level Computer Science are not only about writing code. You need to be confident with data types, variables, control structures, subroutines and standard algorithms, and you need to express your thinking clearly in pseudocode.
在 Edexcel A-Level 计算机科学中，编程题不仅仅是编写代码。你需要熟练掌握数据类型、变量、控制结构、子程序和标准算法，并能够用伪代码清晰地表达思路。
1. Programming Paradigms | 编程范式
A programming paradigm is a style of programming. Edexcel expects you to identify procedural, object-oriented, event-driven and functional paradigms, and to compare their strengths for a given scenario.
编程范式是一种编程风格。Edexcel 要求你识别过程式、面向对象、事件驱动和函数式范式，并比较它们在给定场景中的优势。
Procedural programming uses a clear sequence of instructions and subroutines. Object-oriented programming uses classes and objects to model data and behaviour. Event-driven programming waits for events such as mouse clicks or key presses.
过程式编程使用清晰的指令序列和子程序。面向对象编程使用类和对象来建模数据与行为。事件驱动编程等待鼠标点击或按键等事件。
2. Data Types and Variables | 数据类型与变量
Selecting the correct data type avoids unnecessary memory use and makes operations predictable. The main types you need are integer, real/float, Boolean, character, string and sometimes date/time.
选择正确的数据类型可避免不必要的内存占用并保证操作可预测。你需要掌握的主要类型是整型、实型/浮点型、布尔型、字符型、字符串型，有时还有日期/时间型。
| Data type | Typical use |
|---|---|
| Integer | whole numbers such as count or age |
| Real/Float | decimal numbers such as price or temperature |
| Boolean | True/False flags |
| Character | single symbol such as ‘A’ |
| String | text such as “Alex” |
For example, storing a phone number as a string avoids losing leading zero
Published by TutorHao | A-Level 编程 Revision Series | aleveler.com
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