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

编程语言 2022-06-27 11:09:57 阅读次数: 0

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

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3、效果展示

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  • 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

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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];

（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;
    }
  }
}

（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;
    }
  }
}

（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;
    }
  }
}

（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);
  }
}

（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;
}

（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;
    }
  }
}

（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);
  }
}

（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");
}

（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");
}

（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");
}

（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");
}

（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;
}

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;
}

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