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@ -304,15 +304,40 @@ a: No such file or directory
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各模块的主要功能如下：
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#### main
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系统主函数模块，显示菜单，根据用户选择的菜单命令，执行相关操作。
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#### init
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系统初始化。
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#### display_menu
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显示菜单命令。
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## 详细设计
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针对概要设计
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#### main
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伪代码：
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```
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Step 1: 初始化
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Step 2: 根据用户选择的命令执行对应的操作
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Step 2.1: 显示菜单
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Step 2.2: 选择菜单命令 c
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Step 2.3: if c == CMD_READ then 读取数据
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Step 2.4: if c == CMD_SAVE then 保存数据
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Step 2.5: if c == CMD_PRINT then 打印数据
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Step 2.6: if c == CMD_QUERY then 查询数据
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Step 2.7: if c == CMD_ADD then 添加数据
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Step 2.8: if c == CMD_UPDATE then 修改数据
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Step 2.9: if c == CMD_DELETE then 删除数据
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Step 2.10: if c == CMD_SORT then 排序数据
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Step 2.11: if c == CMD_MAKE then 显示图表
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Step 2.12: if c == CMD_QUIT then 退出
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```
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流程图：
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