C语言课程设计：学生成绩信息管理系统（排序、平均分、总分）详解

C语言实现学生信息管理系统

1、需求分析

利用C语言编写一个可以对学生成绩信息进行管理的系统
0、退出系统
1、录入学生信息和成绩
2、打印学生信息
3、统计学生人数
4、查找学生信息
5、修改学生信息
6、删除学生信息
7、排序学生成绩
8、生成学生信息文件
9、读取文件学生信息
10、输出各科成绩不及格学生信息
11、输出各科成绩最高分学生信息
12、计算学生成绩总分和平均分

2、功能模块

在这里插入图片描述

3、效果展示

在这里插入图片描述

系统可以对学生成绩信息进行录入、修改、查找、删除、插入、打印、保存、读取、排序、计算总分、平均分

在这里插入图片描述

4、代码详解

（1）学生信息结构体

struct Student   //创建学生信息结构体
{                //每个学生对应一个结构体
  char ID[20];   //学号
  char Name[10]; //姓名
  float Score1;   //英语成绩
  float Score2;   //数学成绩
  float Score3;   //语文成绩
  float Score4;   //程序设计成绩
  float All;     //总分
  float Average; //平均成绩
} students[1000];
1
2
3
4
5
6
7
8
9
10
11

（2）学生信息的录入

void InputStudent() //利用循环录入学生信息
{
  while (1)
  {
    printf("请输入学号:");
    scanf("%s", &students[num].ID);
    getchar();
    printf("请输入姓名:");
    scanf("%s", &students[num].Name);
    getchar();
    printf("请输入成绩:");
    scanf("%f", &students[num].Score1);
    getchar();
    printf("请输入成绩:");
    scanf("%f", &students[num].Score2);
    getchar();
    printf("请输入成绩:");
    scanf("%f", &students[num].Score3);
    getchar();
    printf("请输入成绩:");
    scanf("%f", &students[num].Score4); //依次输入各项数据
    getchar();
    students[num].All = students[num].Score1 + students[num].Score2 + students[num].Score3 + students[num].Score4; //输完数据后自动计算总成绩与平均成绩
    students[num].Average = (students[num].Score1 + students[num].Score2 + students[num].Score3 + students[num].Score4) / 4;
    if (Student_SearchByIndex(students[num].ID) == -1)
    {
      num++; //移向下一个位置
    }
    else
    {
      printf("学号重复，输入数据无效 !\n");
    }

    printf("是否继续?(y/n):>");
    if (getchar() == 'n')
    {
      break;
    }
  }
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40

（3）学生信息的修改

void ModifyStudent() //修改学生成绩
{
  while (1)
  {
    char id[20];
    int index;
    printf("请输入要修改的学生的学号:");
    scanf("%s", &id);
    getchar();
    index = Student_SearchByIndex(id); //调用搜查id函数，根据其返回值确定位置
    if (index == -1)
    {
      printf("学生不存在!\n");
    }
    else
    {
      printf("你要修改的学生信息为:\n");
      Student_DisplaySingle(index);
      printf("-- 请输入新值--\n");
      printf("请输入学号:");
      scanf("%s", &students[index].ID);
      getchar();
      printf("请输入姓名:");
      scanf("%s", &students[index].Name);
      getchar();
      printf("请输入英语成绩:");
      scanf("%f", &students[index].Score1);
      getchar();
      printf("请输入数学成绩:");
      scanf("%f", &students[index].Score2);
      getchar();
      printf("请输入语文成绩:");
      scanf("%f", &students[index].Score3);
      getchar();
      printf("请输入程序设计成绩:");
      scanf("%f", &students[index].Score4); //重新录入一套新的数据替代
      getchar();
      students[index].All = students[index].Score1 + students[index].Score2 + students[index].Score3 + students[index].Score4;
      students[index].Average = (students[index].Score1 + students[index].Score2 + students[index].Score3 + students[index].Score4) / 4;
    }
    printf("是否继续?(y/n):>");
    if (getchar() == 'n')
    {
      break;
    }
  }
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47

（4）学生信息的删除

void DeleteStudent() //删除学生信息
{
  int i;
  while (1)
  {
    char id[20];
    int index;
    printf("请输入要删除的学生的学号:");
    scanf("%s", &id);
    getchar();
    index = Student_SearchByIndex(id); //调用搜查id函数，根据其返回值确定位置
    if (index == -1)
    {
      printf("该学生不存在!\n");
    }
    else
    {
      printf("你要删除的学生信息为:\n");
      Student_DisplaySingle(index);
      printf("是否真的要删除?(y/n)");
      if (getchar() == 'y')
      {
        for (i = index; i < num - 1; i++)
        {
          Copy(students, i, i + 1);
          // students[i]=students[i+1];    //把后边的对象都向前移动
        }
        num--;
      }
      getchar();
    }
    printf("是否继续?(y/n):>");
    if (getchar() == 'n')
    {
      break;
    }
  }
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38

（5）学生信息的打印

void display() //打印已录入的学生信息
{
  int a;
  printf("%10s%10s%8s%8s%8s%8s%10s%10s\n", "学号", "姓名", "英语", "数学", "语文", "程序设计", "总成绩", "平均成绩");
  printf("-------------------------------------------------------------------------\n");
  for (a = 0; a < num; a++)
  {
    printf("%10s%10s%8.2f%8.2f%8.2f%8.2f%10.2f%10.2f\n", students[a].ID, students[a].Name,
           students[a].Score1, students[a].Score2, students[a].Score3, students[a].Score4, students[a].All, students[a].Average);
  }
}
1
2
3
4
5
6
7
8
9
10
11

（6）学生信息的插入

void InsertStudent() //指定位置插入学生信息
{
  int a, b, c;
  printf("请输入你要插入的位置");
  scanf("%d", &a);
  if (a > num)
  {
    printf("输入的位置有误，请重新输入,当前共%d条数据\n", num);
    scanf("%d", &a);
  }

  b = num - 1;
  for (; b >= a - 1; b--)
  {
    // strcpy(students[b+1].ID,students[b].ID);
    // strcpy(students[b+1].Name,students[b].Name);
    // students[b+1].Score1=students[b].Score1;
    // students[b+1].Score2=students[b].Score2;
    // students[b+1].Score3=students[b].Score3;
    // students[b+1].Score4=students[b].Score4;
    // students[b+1].All=students[b].All;
    // students[b+1].Average=students[b].Average;
    Copy(students, b + 1, b); //根据其输入的位置，将其及以后的数据向后移动一个位置
  }
  num++;
  printf("请输入学号:");
  scanf("%s", &students[a - 1].ID);
  getchar();
  printf("请输入姓名:");
  scanf("%s", &students[a - 1].Name);
  getchar();
  printf("请输入英语成绩:");
  scanf("%f", &students[a - 1].Score1);
  getchar();
  printf("请输入数学成绩:");
  scanf("%f", &students[a - 1].Score2);
  getchar();
  printf("请输入语文成绩:");
  scanf("%f", &students[a - 1].Score3);
  getchar();
  printf("请输入程序设计成绩:");
  scanf("%f", &students[a - 1].Score4); //输入新数据
  getchar();
  students[a - 1].All = students[a - 1].Score1 + students[a - 1].Score2 + students[a - 1].Score3 + students[a - 1].Score4;
  students[a - 1].Average = (students[a - 1].Score1 + students[a - 1].Score2 + students[a - 1].Score3 + students[a - 1].Score4) / 4;
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46

（7）学生信息的查询

void search() //查询学生信息
{
  while (1)
  {
    char name[20];
    int index;
    printf("请输入要查询的学生的姓名:");
    scanf("%s", &name);
    getchar();
    index = Student_SearchByName(name); //调用搜查name函数，根据其返回值确定位置
    if (index == -1)
    {
      printf("学生不存在!\n");
    }
    else
    {
      printf("你要查询的学生信息为:\n");
      Student_DisplaySingle(index);
    }
    printf("是否继续?(y/n):>");
    if (getchar() == 'n')
    {
      break;
    }
  }
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

（8）学生成绩的排序

void SortStudent() //根据平均分排序
{
  int i, j;
  // struct students tmp;
  for (i = 0; i < num; i++)
  {
    students[i].Average = (students[i].Score1 + students[i].Score2 + students[i].Score3 + students[i].Score4) / 4;
  }
  for (i = 0; i < num; i++)
  {
    for (j = 1; j < num - i; j++)
    {
      if (students[j - 1].Average < students[j].Average)
      {

        Copy(students, num, j - 1);
        Copy(students, j - 1, j);
        Copy(students, j, num);
        // tmp=students[j-1];
        // students[j-1]=students[j];
        // students[j]=tmp;      //冒泡排序
      }
    }
  }
  int a;
  printf("%10s%10s%8s%8s%8s%8s%10s%10s\n", "学号", "姓名", "英语", "数学", "语文", "程序设计", "总成绩", "平均成绩");
  printf("-------------------------------------------------------------------------\n");
  for (a = 0; a < num; a++)
  {
    printf("%10s%10s%8.2f%8.2f%8.2f%8.2f%10.2f%10.2f\n", students[a].ID, students[a].Name,
           students[a].Score1, students[a].Score2, students[a].Score3, students[a].Score4, students[a].All, students[a].Average);
  }
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33

（9）输出各科成绩不及格学生信息

void SearchLow() //搜索不及格的并输出
{
  int a;
  printf("英语不及格的有：%10s%10s%8s\n", "姓名", "学号", "英语");
  for (a = 0; a < num; a++)
  {
    if (students[a].Score1 < 60)
      printf("\t\t%10s%10s%8.2f\n", students[a].Name, students[a].ID, students[a].Score1); //从头搜索到尾，若小于60就输出
  }

  printf("数学不及格的有：%10s%10s%8s\n", "姓名", "学号", "数学");
  for (a = 0; a < num; a++)
  {
    if (students[a].Score2 < 60)
      printf("\t\t%10s%10s%8.2f\n", students[a].Name, students[a].ID, students[a].Score2);
  }

  printf("语文不及格的有：%10s%10s%8s\n", "姓名", "学号", "语文");
  for (a = 0; a < num; a++)
  {
    if (students[a].Score3 < 60)
      printf("\t\t%10s%10s%8.2f\n", students[a].Name, students[a].ID, students[a].Score3);
  }

  printf("程序设计不及格的有%10s%10s%8s\n", "姓名", "学号","程序设计");
  for (a = 0; a < num; a++)
  {
    if (students[a].Score4 < 60)
      printf("\t\t%10s%10s%8.2f\n", students[a].Name, students[a].ID, students[a].Score4);
  }
  system("pause");
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

（10）输出各科成绩最高分学生信息

void SearchHigh() //搜索成绩最高者输出
{
  int a;
  int max;
  printf("英语成绩最高分为%10s%10s%8s\n", "姓名", "学号", "英语");
  max = students[0].Score1;
  for (a = 1; a < num; a++)
  {
    if (students[a].Score1 > max)
      max = students[a].Score1;
  }
  for (a = 0; a < num; a++)
  {
    if (max == students[a].Score1)
      printf("\t\t%10s%10s%8.2f\n", students[a].Name, students[a].ID, students[a].Score1);
  }

  printf("数学成绩最高分为%10s%10s%8s\n", "姓名", "学号", "数学");
  max = students[0].Score2;
  for (a = 1; a < num; a++)
  {
    if (students[a].Score2 > max)
      max = students[a].Score2;
  }
  for (a = 0; a < num; a++)
  {
    if (max == students[a].Score2)
      printf("\t\t%10s%10s%8.2f\n", students[a].Name, students[a].ID, students[a].Score2);
  }

  printf("语文成绩最高分为%10s%10s%8s\n", "姓名", "学号", "语文");
  max = students[0].Score3;
  for (a = 1; a < num; a++)
  {
    if (students[a].Score3 > max)
      max = students[a].Score3;
  }
  for (a = 0; a < num; a++)
  {
    if (max == students[a].Score3)
      printf("\t\t%10s%10s%8.2f\n", students[a].Name, students[a].ID, students[a].Score3);
  }

  printf("程序设计最高分为%10s%10s%8s\n", "姓名", "学号", "程序设计");
  max = students[0].Score4;
  for (a = 1; a < num; a++)
  {
    if (students[a].Score4 > max)
      max = students[a].Score4;
  }
  for (a = 0; a < num; a++)
  {
    if (max == students[a].Score4)
      printf("\t\t%10s%10s%8.2f\n", students[a].Name, students[a].ID, students[a].Score4);
  }
  system("pause");
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57

（11）生成学生信息文件

void SaveStudent()
{
  FILE *fp = fopen("student-information.txt", "w+");
  fprintf(fp, "%d\n", num);
  for (int i = 0; i < num; i++)
  {
    fprintf(fp, "%s %s %f %f %f %f %f %f\n", students[i].ID, students[i].Name, students[i].Score1, students[i].Score2, students[i].Score3, students[i].Score4, students[i].All, students[i].Average);
  }
  fclose(fp);
  printf("学生信息文件已保存在本地\n");
}
1
2
3
4
5
6
7
8
9
10
11

（12）读取文件学生信息

void LoadInformation()
{
  FILE *fp = fopen("student-information.txt", "r");
  fscanf(fp, "%d", &num);
  for (int i = 0; i < num; i++)
  {
    fscanf(fp, "%s %s %f %f %f %f %f %f\n", students[i].ID, students[i].Name, &students[i].Score1, &students[i].Score2, &students[i].Score3, &students[i].Score4, &students[i].All, &students[i].Average);
  }
  fclose(fp);
  printf("系统已读取文件学生信息\n");
}
1
2
3
4
5
6
7
8
9
10
11

（13）主程序

/*主程序*/
int main()
{
  int i;
  while (1)
  {
    LoadInformation();
    printf("-------------------------------------------------------------------------\n");
    printf("                               请选择系统功能                     \n");
    printf("-------------------------------------------------------------------------\n");
    printf("                        欢迎使用高校学生信息管理系统               \n");
    printf("-------------------------------------------------------------------------\n");
    printf("                             0.退出系统                          \n");
    printf("                             1.学生信息的录入                    \n");
    printf("                             2.学生信息的修改                    \n");
    printf("                             3.学生信息的删除                    \n");
    printf("                             4.学生信息的插入                    \n");
    printf("                             5.学生信息的打印                    \n");
    printf("                             6.学生信息的查找                    \n");
    printf("                             7.学生成绩的排序                    \n");
    printf("                             8.生成学生信息文件                  \n");
    printf("                             9.读取学生信息文件                  \n");
    printf("                            10.输出各科不及格学生信息            \n");
    printf("                            11.输出各科最高分学生信息            \n");
    printf("-------------------------------------------------------------------------\n");
    printf("--------------------------------作者: wink-------------------------------\n");
    printf("请选择(0-11):>");
    scanf("%d", &i);
    switch (i)
    {
    case 1:
      InputStudent();
      break;
    case 2:
      ModifyStudent();
      break;
    case 3:
      DeleteStudent();
      break;
    case 4:
      InsertStudent();
      break;
    case 5:
      display();
      break;
    case 6:
      search();
      break;
    case 7:
      SortStudent();
      break;
    case 8:
      SaveStudent();
      break;
    case 9:
      LoadInformation();
      break;
    case 10:
      SearchLow();
      break;
    case 11:
      SearchHigh();
      break;
    case 0:
    printf("Thanks for using, See you again !");
      exit(0);
    default:;
    }
  }
  return 0;
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71

5、完整代码+注释

#include <stdio.h>
#include <stdlib.h>
#include <stdlib.h>
#include <string.h>

struct Student   //创建学生信息结构体
{                //每个学生对应一个结构体
  char ID[20];   //学号
  char Name[10]; //姓名
  float Score1;   //英语成绩
  float Score2;   //数学成绩
  float Score3;   //语文成绩
  float Score4;   //程序设计成绩
  float All;     //总分
  float Average; //平均成绩
} students[1000];

int num = 0; //计数器

void Copy(struct Student *arr, int i, int j)
{
  strcpy(arr[i].ID, arr[j].ID);
  strcpy(arr[i].Name, arr[j].Name);
  arr[i].Score1 = arr[j].Score1;
  arr[i].Score2 = arr[j].Score2;
  arr[i].Score3 = arr[j].Score3;
  arr[i].Score4 = arr[j].Score4;
  arr[i].All = arr[j].All;
  arr[i].Average = arr[j].Average;
}
int Student_SearchByName(char name[]) //通过姓名来检索学生
{
  int i;
  for (i = 0; i < num; i++)
  {
    if (strcmp(students[i].Name, name) == 0) //通过strcmp函数来对比学生姓名，找到返回在数组的位置
    {
      return i;
    }
  }
  return -1; //未找到返回 -1
}
int Student_SearchByIndex(char id[]) //通过学号来检索学生信息
{
  int i;
  for (i = 0; i < num; i++)
  {
    if (strcmp(students[i].ID, id) == 0) //通过strcmp函数来对比学生id，找到返回位置
    {
      return i;
    }
  }
  return -1; //未找到返回 -1
}

void Student_DisplaySingle(int index) //输出表头
{
  printf("%10s%10s%8s%8s%8s%10s\n", "学号", "姓名", "英语", "数学", "语文", "程序设计", "总成绩", "平均成绩");
  printf("-------------------------------------------------------------\n");
  printf("%10s%10s%8.2f%8.2f%8.2f%8.2f%10.2f%10.2f\n", students[index].ID, students[index].Name,students[index].Score1, students[index].Score2, students[index].Score3, students[index].Score4, students[index].All, students[index].Average);
}
void InputStudent() //利用循环录入学生信息
{
  while (1)
  {
    printf("请输入学号:");
    scanf("%s", &students[num].ID);
    getchar();
    printf("请输入姓名:");
    scanf("%s", &students[num].Name);
    getchar();
    printf("请输入成绩:");
    scanf("%f", &students[num].Score1);
    getchar();
    printf("请输入成绩:");
    scanf("%f", &students[num].Score2);
    getchar();
    printf("请输入成绩:");
    scanf("%f", &students[num].Score3);
    getchar();
    printf("请输入成绩:");
    scanf("%f", &students[num].Score4); //依次输入各项数据
    getchar();
    students[num].All = students[num].Score1 + students[num].Score2 + students[num].Score3 + students[num].Score4; //输完数据后自动计算总成绩与平均成绩
    students[num].Average = (students[num].Score1 + students[num].Score2 + students[num].Score3 + students[num].Score4) / 4;
    if (Student_SearchByIndex(students[num].ID) == -1)
    {
      num++; //移向下一个位置
    }
    else
    {
      printf("学号重复，输入数据无效 !\n");
    }

    printf("是否继续?(y/n):>");
    if (getchar() == 'n')
    {
      break;
    }
  }
}

void ModifyStudent() //修改学生成绩
{
  while (1)
  {
    char id[20];
    int index;
    printf("请输入要修改的学生的学号:");
    scanf("%s", &id);
    getchar();
    index = Student_SearchByIndex(id); //调用搜查id函数，根据其返回值确定位置
    if (index == -1)
    {
      printf("学生不存在!\n");
    }
    else
    {
      printf("你要修改的学生信息为:\n");
      Student_DisplaySingle(index);
      printf("-- 请输入新值--\n");
      printf("请输入学号:");
      scanf("%s", &students[index].ID);
      getchar();
      printf("请输入姓名:");
      scanf("%s", &students[index].Name);
      getchar();
      printf("请输入英语成绩:");
      scanf("%f", &students[index].Score1);
      getchar();
      printf("请输入数学成绩:");
      scanf("%f", &students[index].Score2);
      getchar();
      printf("请输入语文成绩:");
      scanf("%f", &students[index].Score3);
      getchar();
      printf("请输入程序设计成绩:");
      scanf("%f", &students[index].Score4); //重新录入一套新的数据替代
      getchar();
      students[index].All = students[index].Score1 + students[index].Score2 + students[index].Score3 + students[index].Score4;
      students[index].Average = (students[index].Score1 + students[index].Score2 + students[index].Score3 + students[index].Score4) / 4;
    }
    printf("是否继续?(y/n):>");
    if (getchar() == 'n')
    {
      break;
    }
  }
}

void DeleteStudent() //删除学生信息
{
  int i;
  while (1)
  {
    char id[20];
    int index;
    printf("请输入要删除的学生的学号:");
    scanf("%s", &id);
    getchar();
    index = Student_SearchByIndex(id); //调用搜查id函数，根据其返回值确定位置
    if (index == -1)
    {
      printf("该学生不存在!\n");
    }
    else
    {
      printf("你要删除的学生信息为:\n");
      Student_DisplaySingle(index);
      printf("是否真的要删除?(y/n)");
      if (getchar() == 'y')
      {
        for (i = index; i < num - 1; i++)
        {
          Copy(students, i, i + 1);
          // students[i]=students[i+1];    //把后边的对象都向前移动
        }
        num--;
      }
      getchar();
    }
    printf("是否继续?(y/n):>");
    if (getchar() == 'n')
    {
      break;
    }
  }
}
void display() //打印已录入的学生信息
{
  int a;
  printf("%10s%10s%8s%8s%8s%8s%10s%10s\n", "学号", "姓名", "英语", "数学", "语文", "程序设计", "总成绩", "平均成绩");
  printf("-------------------------------------------------------------------------\n");
  for (a = 0; a < num; a++)
  {
    printf("%10s%10s%8.2f%8.2f%8.2f%8.2f%10.2f%10.2f\n", students[a].ID, students[a].Name,
           students[a].Score1, students[a].Score2, students[a].Score3, students[a].Score4, students[a].All, students[a].Average);
  }
}
void InsertStudent() //指定位置插入学生信息
{
  int a, b, c;
  printf("请输入你要插入的位置");
  scanf("%d", &a);
  if (a > num)
  {
    printf("输入的位置有误，请重新输入,当前共%d条数据\n", num);
    scanf("%d", &a);
  }

  b = num - 1;
  for (; b >= a - 1; b--)
  {
    // strcpy(students[b+1].ID,students[b].ID);
    // strcpy(students[b+1].Name,students[b].Name);
    // students[b+1].Score1=students[b].Score1;
    // students[b+1].Score2=students[b].Score2;
    // students[b+1].Score3=students[b].Score3;
    // students[b+1].Score4=students[b].Score4;
    // students[b+1].All=students[b].All;
    // students[b+1].Average=students[b].Average;
    Copy(students, b + 1, b); //根据其输入的位置，将其及以后的数据向后移动一个位置
  }
  num++;
  printf("请输入学号:");
  scanf("%s", &students[a - 1].ID);
  getchar();
  printf("请输入姓名:");
  scanf("%s", &students[a - 1].Name);
  getchar();
  printf("请输入英语成绩:");
  scanf("%f", &students[a - 1].Score1);
  getchar();
  printf("请输入数学成绩:");
  scanf("%f", &students[a - 1].Score2);
  getchar();
  printf("请输入语文成绩:");
  scanf("%f", &students[a - 1].Score3);
  getchar();
  printf("请输入程序设计成绩:");
  scanf("%f", &students[a - 1].Score4); //输入新数据
  getchar();
  students[a - 1].All = students[a - 1].Score1 + students[a - 1].Score2 + students[a - 1].Score3 + students[a - 1].Score4;
  students[a - 1].Average = (students[a - 1].Score1 + students[a - 1].Score2 + students[a - 1].Score3 + students[a - 1].Score4) / 4;
}
void search() //查询学生信息
{
  while (1)
  {
    char name[20];
    int index;
    printf("请输入要查询的学生的姓名:");
    scanf("%s", &name);
    getchar();
    index = Student_SearchByName(name); //调用搜查name函数，根据其返回值确定位置
    if (index == -1)
    {
      printf("学生不存在!\n");
    }
    else
    {
      printf("你要查询的学生信息为:\n");
      Student_DisplaySingle(index);
    }
    printf("是否继续?(y/n):>");
    if (getchar() == 'n')
    {
      break;
    }
  }
}
void SortStudent() //根据平均分排序
{
  int i, j;
  // struct students tmp;
  for (i = 0; i < num; i++)
  {
    students[i].Average = (students[i].Score1 + students[i].Score2 + students[i].Score3 + students[i].Score4) / 4;
  }
  for (i = 0; i < num; i++)
  {
    for (j = 1; j < num - i; j++)
    {
      if (students[j - 1].Average < students[j].Average)
      {

        Copy(students, num, j - 1);
        Copy(students, j - 1, j);
        Copy(students, j, num);
        // tmp=students[j-1];
        // students[j-1]=students[j];
        // students[j]=tmp;      //冒泡排序
      }
    }
  }
  int a;
  printf("%10s%10s%8s%8s%8s%8s%10s%10s\n", "学号", "姓名", "英语", "数学", "语文", "程序设计", "总成绩", "平均成绩");
  printf("-------------------------------------------------------------------------\n");
  for (a = 0; a < num; a++)
  {
    printf("%10s%10s%8.2f%8.2f%8.2f%8.2f%10.2f%10.2f\n", students[a].ID, students[a].Name,
           students[a].Score1, students[a].Score2, students[a].Score3, students[a].Score4, students[a].All, students[a].Average);
  }
}

void SearchLow() //搜索不及格的并输出
{
  int a;
  printf("英语不及格的有：%10s%10s%8s\n", "姓名", "学号", "英语");
  for (a = 0; a < num; a++)
  {
    if (students[a].Score1 < 60)
      printf("\t\t%10s%10s%8.2f\n", students[a].Name, students[a].ID, students[a].Score1); //从头搜索到尾，若小于60就输出
  }

  printf("数学不及格的有：%10s%10s%8s\n", "姓名", "学号", "数学");
  for (a = 0; a < num; a++)
  {
    if (students[a].Score2 < 60)
      printf("\t\t%10s%10s%8.2f\n", students[a].Name, students[a].ID, students[a].Score2);
  }

  printf("语文不及格的有：%10s%10s%8s\n", "姓名", "学号", "语文");
  for (a = 0; a < num; a++)
  {
    if (students[a].Score3 < 60)
      printf("\t\t%10s%10s%8.2f\n", students[a].Name, students[a].ID, students[a].Score3);
  }

  printf("程序设计不及格的有%10s%10s%8s\n", "姓名", "学号","程序设计");
  for (a = 0; a < num; a++)
  {
    if (students[a].Score4 < 60)
      printf("\t\t%10s%10s%8.2f\n", students[a].Name, students[a].ID, students[a].Score4);
  }
  system("pause");
}

void SearchHigh() //搜索成绩最高者输出
{
  int a;
  int max;
  printf("英语成绩最高分为%10s%10s%8s\n", "姓名", "学号", "英语");
  max = students[0].Score1;
  for (a = 1; a < num; a++)
  {
    if (students[a].Score1 > max)
      max = students[a].Score1;
  }
  for (a = 0; a < num; a++)
  {
    if (max == students[a].Score1)
      printf("\t\t%10s%10s%8.2f\n", students[a].Name, students[a].ID, students[a].Score1);
  }

  printf("数学成绩最高分为%10s%10s%8s\n", "姓名", "学号", "数学");
  max = students[0].Score2;
  for (a = 1; a < num; a++)
  {
    if (students[a].Score2 > max)
      max = students[a].Score2;
  }
  for (a = 0; a < num; a++)
  {
    if (max == students[a].Score2)
      printf("\t\t%10s%10s%8.2f\n", students[a].Name, students[a].ID, students[a].Score2);
  }

  printf("语文成绩最高分为%10s%10s%8s\n", "姓名", "学号", "语文");
  max = students[0].Score3;
  for (a = 1; a < num; a++)
  {
    if (students[a].Score3 > max)
      max = students[a].Score3;
  }
  for (a = 0; a < num; a++)
  {
    if (max == students[a].Score3)
      printf("\t\t%10s%10s%8.2f\n", students[a].Name, students[a].ID, students[a].Score3);
  }

  printf("程序设计最高分为%10s%10s%8s\n", "姓名", "学号", "程序设计");
  max = students[0].Score4;
  for (a = 1; a < num; a++)
  {
    if (students[a].Score4 > max)
      max = students[a].Score4;
  }
  for (a = 0; a < num; a++)
  {
    if (max == students[a].Score4)
      printf("\t\t%10s%10s%8.2f\n", students[a].Name, students[a].ID, students[a].Score4);
  }
  system("pause");
}
void SaveStudent()
{
  FILE *fp = fopen("student-information.txt", "w+");
  fprintf(fp, "%d\n", num);
  for (int i = 0; i < num; i++)
  {
    fprintf(fp, "%s %s %f %f %f %f %f %f\n", students[i].ID, students[i].Name, students[i].Score1, students[i].Score2, students[i].Score3, students[i].Score4, students[i].All, students[i].Average);
  }
  fclose(fp);
  printf("学生信息文件已保存在本地\n");
}
void LoadInformation()
{
  FILE *fp = fopen("student-information.txt", "r");
  fscanf(fp, "%d", &num);
  for (int i = 0; i < num; i++)
  {
    fscanf(fp, "%s %s %f %f %f %f %f %f\n", students[i].ID, students[i].Name, &students[i].Score1, &students[i].Score2, &students[i].Score3, &students[i].Score4, &students[i].All, &students[i].Average);
  }
  fclose(fp);
  printf("系统已读取文件学生信息\n");
}

/*主程序*/
int main()
{
  int i;
  while (1)
  {
    LoadInformation();
    printf("-------------------------------------------------------------------------\n");
    printf("                               请选择系统功能                     \n");
    printf("-------------------------------------------------------------------------\n");
    printf("                        欢迎使用高校学生信息管理系统               \n");
    printf("-------------------------------------------------------------------------\n");
    printf("                             0.退出系统                          \n");
    printf("                             1.学生信息的录入                    \n");
    printf("                             2.学生信息的修改                    \n");
    printf("                             3.学生信息的删除                    \n");
    printf("                             4.学生信息的插入                    \n");
    printf("                             5.学生信息的打印                    \n");
    printf("                             6.学生信息的查找                    \n");
    printf("                             7.学生成绩的排序                    \n");
    printf("                             8.生成学生信息文件                  \n");
    printf("                             9.读取学生信息文件                  \n");
    printf("                            10.输出各科不及格学生信息            \n");
    printf("                            11.输出各科最高分学生信息            \n");
    printf("-------------------------------------------------------------------------\n");
    printf("--------------------------------作者: wink-------------------------------\n");
    printf("请选择(0-11):>");
    scanf("%d", &i);
    switch (i)
    {
    case 1:
      InputStudent();
      break;
    case 2:
      ModifyStudent();
      break;
    case 3:
      DeleteStudent();
      break;
    case 4:
      InsertStudent();
      break;
    case 5:
      display();
      break;
    case 6:
      search();
      break;
    case 7:
      SortStudent();
      break;
    case 8:
      SaveStudent();
      break;
    case 9:
      LoadInformation();
      break;
    case 10:
      SearchLow();
      break;
    case 11:
      SearchHigh();
      break;
    case 0:
    printf("Thanks for using, See you again !");
      exit(0);
    default:;
    }
  }
  return 0;
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489

相关阅读:
Springboot+高校教材预订信息管理系统毕业设计-附源码150905
三相异步电机动态数学模型及矢量控制仿真
 栈、队列应用
 【jquery Ajax 】form表单教学+评论案例
 颈椎神经分布立体图高清,颈椎神经分布立体图片
 【总目录】机器学习原理剖析、开源实战项目、全套学习指南（50篇合集）
204.计数质数 | 372.超级次方
 Mysql常用函数(二)
中石化、中石油接口文档源码分享
 前端培训丁鹿学堂：vue3之watchEffect和生命周期函数总结
原文地址：https://blog.csdn.net/weixin_61370021/article/details/125465888