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### C1: 启动程序
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命令行中执行命令./app,系统启动，显示提示信息，然后显示功能菜单，等待用户输入命令。
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```
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Management for Students'scores
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1 Input record
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2 Calculate total and average score of every course
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3 Calculate total and average score of every student
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4 Sort in descending order by score
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5 Sort in ascending order by score
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6 Sort in ascending order by number
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7 Sort in dictionary order by name
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8 Search by number
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9 Search by name
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10 Statistic analysis
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11 List record
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12 Write to a file
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13 Read from a file
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0 Exit
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Please Input your choice:
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```
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### C2: 显示命令菜单
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调用 Menu() 函数显示命令菜单，用户输入选项后，将结果返回主函数
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```
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Management for Students'scores
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1 Input record
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2 Calculate total and average score of every course
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3 Calculate total and average score of every student
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4 Sort in descending order by score
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5 Sort in ascending order by score
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6 Sort in ascending order by number
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7 Sort in dictionary order by name
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8 Search by number
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9 Search by name
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10 Statistic analysis
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11 List record
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12 Write to a file
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13 Read from a file
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0 Exit
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Please Input your choice:
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```
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### C3: 退出程序
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选择菜单命令 0 ，再输入 y 确认，则退出程序。
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```
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Please Input your choice: 0
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Are you sure you want to exit?(Y/N): y
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End of program!
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```
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### C4: 添加学生信息
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选择菜单命令 1 ，假设n=4,m=3,提示输入学生的学号，姓名和成绩，然后利用循环逐个输入学生的学号和姓名以及各科成绩。
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```
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Please Input your choice: 1
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Input student's ID, name and score:
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2214111006 XuZilin 100 95 86
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2214111009 XuZigui 77 89 99
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2214111011 ZhangYu 85 91 98
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2214111025 LiYujia 75 89 100
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```
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### C5: 计算学生各门课程总分和平均分
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选择菜单命令 2 ，计算学生各门课程总分和平均分,然后利用循环逐个输出学生的顺序，总成绩和平均分，结果都取整数。
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```
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Please Input your choice: 2
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student 1: sum = 281, aver = 93
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student 2: sum = 265, aver = 88
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student 3: sum = 274, aver = 91
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student 4: sum = 264, aver = 88
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```
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### C6: 计算每门课程的总分和平均分
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选择菜单命令 3 ，计算每门课程的总分和平均分，然后利用循环逐个输出每门课程的总分和平均分，结果都取整数。
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```
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Please Input your choice: 3
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course 1: sum = 337, aver = 84
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course 2: sum = 364, aver = 91
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course 3: sum = 383, aver = 95
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```
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### C7: 学生总分排序
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如果a < b,则按升序排列。选择菜单命令 4 ，按选择法将数组 sum 的元素值按升序进行排序，显示提示信息，最后打印出学生信息。
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如果a > b,则按降序排序。选择菜单命令 5 ，按选择法将数组 sum 的元素值按降序进行排序，显示提示信息，最后打印出学生成绩。
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```
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Please Input your choice: 4
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Sort in descending order by score:
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2214111006 XuZilin 100 95 86 281 93
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2214111011 ZhangYu 85 91 98 274 91
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2214111009 XuZigui 77 89 99 265 88
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2214111025 LiYujia 75 89 100 264 88
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Please Input your choice: 5
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Sort in ascending order by score:
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2214111025 LiYujia 75 89 100 264 88
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2214111009 XuZigui 77 89 99 265 88
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2214111011 ZhangYu 85 91 98 274 91
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2214111006 XuZilin 100 95 86 281 93
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```
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### C8: 学号顺序排序
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选择菜单命令 6 ，按学号从小到大进行排序，显示提示信息，最后打印学生信息。
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```
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Please Input your choice: 6
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Sort in ascending order by number:
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2214111006 XuZilin 100 95 86 281 93
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2214111009 XuZigui 77 89 99 265 88
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2214111011 ZhangYu 85 91 98 274 91
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2214111025 LiYujia 75 89 100 264 88
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```
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### C9: 姓名顺序排序
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选择菜单命令 7 ，按姓名的字典顺序进行排序，显示提示信息，最后打印学生信息。
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```
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Please Input your choice: 7
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Sort in dictionary order by name:
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2214111025 LiYujia 75 89 100 264 88
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2214111009 XuZigui 77 89 99 265 88
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2214111006 XuZilin 100 95 86 281 93
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2214111011 ZhangYu 85 91 98 274 91
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```
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### C10: 学生信息查询
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- 选择菜单命令 8 ，提示输入学生学号，若该学号存在，则输出学生信息；否则提示没有找到并结束。
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```
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Please Input your choice: 8
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Input the number you want to search:2214111011
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2214111011 ZhangYu 85 91 98 274 91
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1 Input record
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2 Calculate total and average score of every course
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3 Calculate total and average score of every student
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4 Sort in descending order by score
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5 Sort in ascending order by score
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6 Sort in ascending order by number
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7 Sort in dictionary order by name
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8 Search by number
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9 Search by name
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10 Statistic analysis
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11 List record
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12 Write to a file
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13 Read from a file
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0 Exit
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Please Input your choice: 8
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Input the number you want to search:2214111001
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Not found!
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```
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- 选择菜单命令 9 ，提示输入学生姓名，若该姓名存在，则输出学生信息；否则提示没有找到并结束。
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```
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Please Input your choice: 9
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Input the name you want to search:LiYujia
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2214111025 LiYujia 75 89 100 264 88
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1 Input record
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2 Calculate total and average score of every course
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3 Calculate total and average score of every student
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4 Sort in descending order by score
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5 Sort in ascending order by score
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6 Sort in ascending order by number
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7 Sort in dictionary order by name
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8 Search by number
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9 Search by name
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10 Statistic analysis
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11 List record
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12 Write to a file
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13 Read from a file
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0 Exit
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Please Input your choice: 9
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Input the name you want to search:SunYizhe
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Not found!
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```
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### C11: 统计各分数段学生人数及所占百分比
|
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选择菜单命令 10，提示输入学生成绩，通过循环得出各分数段学生人数及所占百分比
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```
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Please Input your choice: 10
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For course 1:
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```
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