A-Level Edexcel Programming: Operators and Programming Structures | A-Level Edexcel 编程：运算符与程序结构

📚 A-Level Edexcel Programming: Operators and Programming Structures | A-Level Edexcel 编程：运算符与程序结构

Understanding operators and programming structures is essential for success in the Edexcel A-Level Computer Science Paper 2 and the non-exam assessment. This article covers arithmetic, comparison and Boolean operators, precedence rules, and the three core control structures: sequence, selection and iteration.

理解运算符和程序结构对于在 Edexcel A-Level 计算机科学 Paper 2 及课程作业中取得成功至关重要。本文涵盖算术、比较和布尔运算符、优先级规则，以及三种核心控制结构：顺序、选择和迭代。

1. Arithmetic Operators and Precedence | 算术运算符与优先级

In Edexcel pseudocode, arithmetic operators include + addition, – subtraction, * multiplication, / division, DIV integer division, MOD remainder and ^ exponentiation. The result of DIV and MOD depends on whole-number operands.

在 Edexcel 伪代码中，算术运算符包括 + 加法、– 减法、* 乘法、/ 除法、DIV 整除、MOD 取余和 ^ 幂运算。DIV 和 MOD 的结果取决于整数操作数。

Operators are evaluated in a strict order: brackets first, then ^, then * / DIV MOD, and finally + –. For example, 3 + 4 * 2 equals 11 because multiplication happens before addition.

运算符按严格顺序求值：先括号，然后 ^，接着 * / DIV MOD，最后 + –。例如，3 + 4 * 2 的结果是 11，因为乘法先于加法进行。

2. Comparison Operators | 比较运算符

Comparison operators compare two values and return a Boolean result. Edexcel pseudocode uses = for equality, <> for not equal, > for greater than, < for less than, >= for greater than or equal to, and <= for less than or equal to.

比较运算符用于比较两个值并返回布尔结果。Edexcel 伪代码使用 = 表示等于，<> 表示不等于，> 表示大于，< 表示小于，>= 表示大于或等于，<= 表示小于或等于。

In Python the equivalents are ==, !=, >, <, >= and <=. Do not confuse the assignment operator <- in pseudocode with the equality sign =.

在 Python 中等价运算符是 ==、!=、>、<、>= 和 <=。不要将伪代码中的赋值运算符 <- 与等号 = 混淆。

5 > 3 → TRUE   |   4 = 4 → TRUE   |   2 <> 2 → FALSE

3. Boolean Operators | 布尔运算符

Boolean operators

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