A-Level Edexcel Programming: Operators, Control Structures and OOP | A-Level Edexcel 编程：运算符、控制结构与面向对象

📚 A-Level Edexcel Programming: Operators, Control Structures and OOP | A-Level Edexcel 编程：运算符、控制结构与面向对象

Programming forms the core of the Edexcel A-Level Computer Science specification. To succeed in Paper 2 you must be confident in using pseudocode to express data types, operators, selection, iteration, subroutines and object-oriented principles.

编程是 Edexcel A-Level 计算机科学课程的核心。要想在 Paper 2 中取得好成绩，你必须熟练使用伪代码表达数据类型、运算符、选择结构、迭代结构、子程序以及面向对象原则。

1. Data Types and Variables | 数据类型与变量

Every value in a program belongs to a data type. The most common primitive types tested by Edexcel are integer, real, Boolean, character and string.

程序中的每个值都属于某种数据类型。Edexcel 考查的最常见原始类型包括整型、实数型、布尔型、字符型和字符串型。

Variables are named storage locations. You should declare them with a name and type before use, for example DECLARE age AS INTEGER.

变量是命名的存储位置。你应该在使用前用名称和类型声明它们，例如 DECLARE age AS INTEGER。

• Integer: whole numbers such as -3, 0, 42
• Real: decimal numbers such as 3.14, -0.001
• Boolean: TRUE or FALSE
• Character: a single symbol such as ‘a’ or ‘7’
• String: a sequence of characters such as ‘hello’

整型：如 -3、0、42 等整数；实数型

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