Snobol4【1】 语言实战：身份证号【2】性别代码【3】解析实战
Snobol4 是一种古老的编程语言，由David J. Farber、Ralph E. Griswold 和 Ivan P. Polonsky 在1962年设计。它以其简洁的语法和强大的字符串处理能力而闻名。本文将围绕 Snobol4 语言，通过一个身份证号性别代码解析的实战案例，展示 Snobol4 语言在数据处理【4】和字符串操作【5】方面的强大功能。
身份证号性别代码解析背景
在中国，身份证号是每个人的唯一身份标识。身份证号由18位数字组成，其中第17位是性别代码。性别代码的规则如下：
- 奇数表示男性（1, 3, 5, 7, 9）
- 偶数表示女性（0, 2, 4, 6, 8）
为了验证身份证号的性别代码，我们需要编写一个程序，该程序能够读取身份证号，提取第17位数字，并判断其性别。
Snobol4 语言简介
Snobol4 是一种高级编程语言，特别适合于文本处理和字符串操作。它的语法简洁，易于理解。以下是 Snobol4 语言的一些基本概念：
- 变量【6】：用于存储数据。
- 控制结构【7】：包括条件语句【8】（IF-THEN-ELSE）、循环语句【9】（WHILE）等。
- 字符串操作：提供丰富的字符串处理函数，如搜索、替换、匹配等。
身份证号性别代码解析实战
以下是一个使用 Snobol4 语言编写的身份证号性别代码解析程序：
```snobol
:input
input: idnum
output: gender【10】
17 pick idnum
0 = gender
1 = male
2 = female
3 = male
4 = female
5 = male
6 = female
7 = male
8 = female
9 = male
10 = error【11】
11 = error
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