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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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ReadScore
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输入n个学生的m门课成绩
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AverSumofEveryStudent
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计算每个学生各门课程的总分和平均分
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AverSumofEveryCourse
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计算每门课程的总分和平均分
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SortbyScore
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按选择法将数组sum的元素值排序
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Ascending
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使数据按升序排序
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Descending
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使数据按降序排序
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SwapFloat
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交换两个单精度浮点型数据
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SwapLong
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交换两个长整型数据
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SwapChar
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交换两个字符串
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AsSortbyNum
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按选择法将数组num的元素值按从低到高排序
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AsSortbyNum
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交换法实现字符串按字典顺序排序
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SearchbyNum
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按学号查找学生成绩并显示查找结果
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SearchbyName
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按姓名的字典顺序排出成绩表
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StatisticAnalysis
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统计各分数段的学生人数及所占的百分比
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PrintScore
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打印学生成绩
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WritetoFile
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输出n个学生的学号、姓名及m门课程的成绩到文件student.txt中
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ReadfromFile
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从文件中读取学生的学号、姓名及成绩等信息写入到结构体数组stu中
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