学生信息管理系统（C语言结构体数组版）-阿里云开发者社区

学生信息管理系统，有5个功能，大致框架：用switch语句写出功能的选择，每个功能写出一个函数。代码在这，如有需要自行查看
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <string.h>
#define M 20
#define G 20
#define F 20
struct stu
{
  int number;
  char name[M];
  char sex[F];
  int age;
  float math;
  float Chinese;
  float English;
  float total_score;
}student[G];
//函数的声明
void menu();
void input_message();
void delete_message();
void search_message();
void modify_message();
void show_message();
int sum = 0;  //表示录入信息的人数
int main()
{
  while (1)
  {
    system("cls");
    menu();
    char ch = _getch();
    {
      switch (ch)
      {
      case '1':
        input_message();
        break;
      case '2':
        delete_message();
        break;
      case '3':
        modify_message();
        break;
      case '4':
        search_message();
        break;
      case '5':
        show_message();
        break;
      case '0':
        return 0;
        break;
      default:
        printf("请在0—5中选择\n");
        break;
      }
    }
    system("pause");
  }
  return 0;
}
void menu()
{
  printf("***********************欢迎使用学生管理系统(当前共有%d名学生)***********************\n", sum);
  printf("*                                                                                  *\n");
  printf("*                       -----------------------------------                        *\n");
  printf("*                       |                                 |                        *\n");
  printf("*                       |                                 |                        *\n");
  printf("*                       |                                 |                        *\n");
  printf("*                       |                                 |                        *\n");
  printf("*                       -----------------------------------                        *\n");
  printf("*                                                                                  *\n");
  printf("*                       1.添加学生信息                                             *\n");
  printf("*                       2.删除学生信息（根据学号）                                 *\n");
  printf("*                       3.修改学生信息（根据学号）                                 *\n");
  printf("*                       4.查询学生信息                                             *\n");
  printf("*                       5.显示所有学生信息以及统计信息                             *\n");
  printf("*                       0.退出软件                                                 *\n");
  printf("*                                                                                  *\n");
  printf("************************************************************************************\n");
}
void input_message()
{
  int i;
  int n;
  i = sum; // 结束循环后，能够再次进入
  while (i < sum + 1)
  {
    n = 1;
    while (n)
    {
      n = 0;
      printf("输入学号：");
      scanf_s("%d", &student[i].number);
      printf("输入姓名：");
      scanf_s("%s", student[i].name, M);
      printf("输入性别：");
      scanf_s("%s", &student[i].sex, F);
      printf("输入年龄：");
      scanf_s("%d", &student[i].age);
      printf("数学成绩：");
      scanf_s("%f", &student[i].math);
      printf("语文成绩：");
      scanf_s("%f", &student[i].Chinese);
      printf("英语成绩：");
      scanf_s("%f", &student[i].English);
      for (int j = 0; j < i; j++)
      {
        if (student[i].number == student[j].number)  //判断是否重复
        {
          printf("错误：该学生信息已存在，无需重复添加！");
          return;    //退出函数
          n = 1;
          break;
        }
      }
    }
    if (n == 0)
    {
      printf("提示：添加成功\n");
      i++;
    }
  }
  ++sum;
}
void delete_message()
{
  int i = 0;
  int arr1;
  printf("输入学号：");
  scanf_s("%d", &arr1);
  for (i = 0; i < sum; i++)
  {
    if (student[i].number == arr1)
    {
      if (i == sum - 1)                       //判断是不是数组最后一个元素 
      {
        printf("提示：删除成功，");
        sum--;
        return;
      }
      else
      {
        for (int j = i; j < sum - 1; j++)
        {
          student[j] = student[j + 1];    // 赋值删除
        }
        printf("提示：删除成功，");
        sum--;
        return;  // 退出函数
      }
    }
  }
  printf("错误：该学生信息不存在，删除失败！");
}
void modify_message()
{
  int ID;
  printf("输入学号:");
  scanf_s("%d", &ID);
  for (int i = 0; i < sum; ++i)
  {
    if (ID == student[i].number)
    {
      printf("输入姓名：");
      scanf_s("%s", student[i].name, M);
      printf("输入性别：");
      scanf_s("%s", &student[i].sex, F);
      printf("输入年龄：");
      scanf_s("%d", &student[i].age);
      printf("数学成绩：");
      scanf_s("%f", &student[i].math);
      printf("语文成绩：");
      scanf_s("%f", &student[i].Chinese);
      printf("英语成绩：");
      scanf_s("%f", &student[i].English);
      printf("提示：修改成功。");
      system("pause");
    }
    else if (i + 1 == sum)
    {
      printf("错误：该学生信息不存在，修改失败！");
    }
  }
}
void search_message()
{
  system("cls");
  printf("************查询学生成绩（当前共有%d名学生）************************\n", sum);
  printf("*                                                                 *\n");
  printf("*             1.根据学号查询                                      *\n");
  printf("*             2.根据姓名查询                                      *\n");
  printf("*             3.根据数学成绩查询                                  *\n");
  printf("*             4.根据语文成绩查询                                  *\n");
  printf("*             5.根据英语成绩查询                                  *\n");
  printf("*             6.根据总成绩查询                                    *\n");
  printf("*             0.返回主菜单                                        *\n");
  printf("*                                                                 *\n");
  printf("*******************************************************************\n");
  char p = _getch();
  switch (p)
  {
  case '1':
  {
    printf("输入学号：");
    int arr2;
    scanf_s("%d", &arr2);
    int count = 0;
    for (int i = 0; i < sum; i++)
    {
      if (student[i].number == arr2)
      {
        student[i].total_score = (student[i].math + student[i].English + student[i].Chinese);
        printf("----------------------------------------------------------------------\n");
        printf(" 学号\t|姓名\t|性别\t|年龄\t|数学\t|语文\t|英语\t|总成绩\t\n");
        printf("----------------------------------------------------------------------\n");
        printf(" %d\t|%s\t|%s\t|%d\t|%.2f\t|%.2f\t|%.2f\t|%.2f\t\n",
          student[i].number, student[i].name, student[i].sex, student[i].age, student[i].math,
          student[i].Chinese, student[i].English, student[i].total_score);
        printf("----------------------------------------------------------------------\n");
        ++count;
        system("pause");
        system("cls");
        return search_message();
      }
      else if (i + 1 == sum)
      {
        printf("查无此人");
        system("pause");
        system("cls");
        return search_message();
      }
    }
    printf("共查询%d条记录\n", count);
    break;
  }
  case '2':
  {
    printf("输入姓名：");
    char arr3[20];
    scanf_s("%s", arr3, 20);
    int count = 0;
    for (int i = 0; i < sum; i++)
    {
      if (strcmp(student[i].name, arr3) == 0)
      {
        student[i].total_score = (student[i].math + student[i].English + student[i].Chinese);
        printf("----------------------------------------------------------------------\n");
        printf(" 学号\t|姓名\t|性别\t|年龄\t|数学\t|语文\t|英语\t|总成绩\t\n");
        printf("----------------------------------------------------------------------\n");
        printf(" %d\t|%s\t|%s\t|%d\t|%.2f\t|%.2f\t|%.2f\t|%.2f\t\n",
          student[i].number, student[i].name, student[i].sex, student[i].age, student[i].math,
          student[i].Chinese, student[i].English, student[i].total_score);
        printf("----------------------------------------------------------------------\n");
        ++count;
        system("pause");
        system("cls");
        return search_message();
      }
      else if (i + 1 == sum)
      {
        printf("查无此人");
        system("pause");
        system("cls");
        return search_message();
      }
    }
    printf("共查询%d条记录\n", count);
    break;
  }
  case '3':
  {
    int count = 0;       //查询的条数
    float a, b;
    printf("要查询的数学成绩的范围：");
    scanf_s("%f%f", &a, &b);
    for (int i = 0; i < sum; i++)
    {
      if (student[i].math >= a && student[i].math <= b)
      {
        printf("----------------------------------------------------------------------\n");
        printf(" 学号\t|姓名\t|性别\t|年龄\t|数学\t|语文\t|英语\t|总成绩\t\n");
        printf("----------------------------------------------------------------------\n");
        break;
      }
      else if (i + 1 == sum)
      {
        printf("查无此人");
        system("pause");
        system("cls");
        return search_message();
      }
    }
    for (int i = 0; i < sum; i++)
    {
      if (student[i].math >= a && student[i].math <= b)
      {
        student[i].total_score = (student[i].math + student[i].English + student[i].Chinese);
        printf(" %d\t|%s\t|%s\t|%d\t|%.2f\t|%.2f\t|%.2f\t|%.2f\t\n",
          student[i].number, student[i].name, student[i].sex, student[i].age, student[i].math,
          student[i].Chinese, student[i].English, student[i].total_score);
        ++count;
      }
    }
    printf("----------------------------------------------------------------------\n");
    printf("共查询%d条记录\n", count);
    system("pause");
    system("cls");
    return search_message();
    break;
  }
  case '4':
  {
    int count = 0;
    float c, d;
    printf("要查询的语文成绩的范围：");
    scanf_s("%f%f", &c, &d);
    for (int i = 0; i < sum; i++)
    {
      if (student[i].Chinese >= c && student[i].Chinese <= d)
      {
        printf("----------------------------------------------------------------------\n");
        printf(" 学号\t|姓名\t|性别\t|年龄\t|数学\t|语文\t|英语\t|总成绩\t\n");
        printf("----------------------------------------------------------------------\n");
        break;
      }
      else if (i + 1 == sum)
      {
        printf("查无此人");
        system("pause");
        system("cls");
        return search_message();
      }
    }
    for (int i = 0; i < sum; i++)
    {
      if (student[i].Chinese >= c && student[i].Chinese <= d)
      {
        student[i].total_score = (student[i].math + student[i].English + student[i].Chinese);
        printf(" %d\t|%s\t|%s\t|%d\t|%.2f\t|%.2f\t|%.2f\t|%.2f\t\n",
          student[i].number, student[i].name, student[i].sex, student[i].age, student[i].math,
          student[i].Chinese, student[i].English, student[i].total_score);
        ++count;
      }
    }
    printf("----------------------------------------------------------------------\n");
    printf("共查询%d条记录\n", count);
    system("pause");
    system("cls");
    return search_message();
    break;
  }
  case '5':
  {
    int count = 0;
    float e, f;
    printf("要查询的英语成绩的范围：");
    scanf_s("%f%f", &e, &f);
    for (int i = 0; i < sum; i++)
    {
      if (student[i].English >= e && student[i].English <= f)
      {
        printf("----------------------------------------------------------------------\n");
        printf(" 学号\t|姓名\t|性别\t|年龄\t|数学\t|语文\t|英语\t|总成绩\t\n");
        printf("----------------------------------------------------------------------\n");
        break;
      }
      else if (i + 1 == sum)
      {
        printf("查无此人");
        system("pause");
        system("cls");
        return search_message();
      }
    }
    for (int i = 0; i < sum; i++)
    {
      if (student[i].English >= e && student[i].English <= f)
      {
        student[i].total_score = (student[i].math + student[i].English + student[i].Chinese);
        printf(" %d\t|%s\t|%s\t|%d\t|%.2f\t|%.2f\t|%.2f\t|%.2f\t\n",
          student[i].number, student[i].name, student[i].sex, student[i].age, student[i].math,
          student[i].Chinese, student[i].English, student[i].total_score);
        ++count;
      }
    }
    printf("----------------------------------------------------------------------\n");
    printf("共查询%d条记录\n", count);
    system("pause");
    system("cls");
    return search_message();
    break;
  }
  case '6':
  {
    float g, h;
    int count = 0;
    printf("要查询的总成绩的范围：");
    scanf_s("%f%f", &g, &h);
    for (int i = 0; i < sum; i++)
    {
      student[i].total_score = (student[i].math + student[i].English + student[i].Chinese);
      if (student[i].total_score >= g && student[i].total_score <= h)
      {
        printf("----------------------------------------------------------------------\n");
        printf(" 学号\t|姓名\t|性别\t|年龄\t|数学\t|语文\t|英语\t|总成绩\t\n");
        printf("----------------------------------------------------------------------\n");
        break;
      }
      else if (i + 1 == sum)
      {
        printf("查无此人");
        system("pause");
        system("cls");
        return search_message();
      }
    }
    for (int i = 0; i < sum; i++)
    {
      student[i].total_score = (student[i].math + student[i].English + student[i].Chinese);
      if (student[i].total_score >= g && student[i].total_score <= h)
      {
        printf(" %d\t|%s\t|%s\t|%d\t|%.2f\t|%.2f\t|%.2f\t|%.2f\t\n",
          student[i].number, student[i].name, student[i].sex, student[i].age, student[i].math,
          student[i].Chinese, student[i].English, student[i].total_score);
        ++count;
      }
    }
    printf("----------------------------------------------------------------------\n");
    printf("共查询%d条记录\n", count);
    system("pause");
    system("cls");
    return search_message();
    break;
  }
  case '0':
    system("cls");
    return menu();
    break;
  default:
    printf("请在0—6中选择\n");
    system("pause");
    system("cls");
    return search_message();
    break;
  }
}
void show_message()
{
  system("cls");
  float  m_score = 0, C_score = 0, E_score = 0; // 数学，语文，英语 各自的平均成绩
  float t_score = 0; // 总成绩的平均成绩
  float t_age = 0;
  const char arr4[3] = "男";
  int  boy = 0; //统计男生总人数 
  int girl = 0; //统计女生总人数
  int count = 0;// 统计信息条数
  for (int i = 0; i < sum; i++)
  {
    if (strcmp(arr4, student[i].sex) == 0)
    {
      ++boy;
    }
    else
    {
      ++girl;
    }
    m_score += student[i].math;     //数学总成绩
    C_score += student[i].Chinese;  // 语文总成绩
    E_score += student[i].English; // 英语总成绩
    t_age += student[i].age;       // 总年龄
    student[i].total_score = (student[i].math + student[i].English + student[i].Chinese);
    t_score += student[i].total_score;  // 总成绩之和
  }
  m_score = m_score / sum;
  C_score = C_score / sum;
  E_score = E_score / sum;
  t_age = t_age / sum;
  t_score = t_score / sum;
  if (sum == 0)
  {
    printf("----------------------------------------------------------------------\n");
    printf(" 学号\t|姓名\t|性别\t|年龄\t|数学\t|语文\t|英语\t|总成绩\t\n");
    printf("----------------------------------------------------------------------\n");
    printf("  --\t|--\t|0/0\t|无\t|无\t|无\t|无\t|无\t\n");
    printf("----------------------------------------------------------------------\n");
    printf("共查询0条记录\n");
    printf("请输入学生信息\n");
  }
  if (sum != 0)
  {
    printf("----------------------------------------------------------------------\n");
    printf(" 学号\t|姓名\t|性别\t|年龄\t|数学\t|语文\t|英语\t|总成绩\t\n");
    printf("----------------------------------------------------------------------\n");
    for (int i = 0; i < sum; i++)
    {
      printf("  %d\t|%s\t|%s\t|%d\t|%.2f\t|%.2f\t|%.2f\t|%.2f\t\n",
        student[i].number, student[i].name, student[i].sex, student[i].age, student[i].math,
        student[i].Chinese, student[i].English, student[i].total_score);
      ++count;
    }
    printf("----------------------------------------------------------------------\n");
    printf("  --\t|--\t|%d/%d\t|%.2f\t|%.2f\t|%.2f\t|%.2f\t|%.2f\t\n",
      boy, girl, t_age, m_score, C_score, E_score, t_score);
    printf("----------------------------------------------------------------------\n");
    printf("共查询%d条记录\n", count);
  }
}
学生信息管理系统（C语言结构体数组版）

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