C小项目 —— 学生信息管理系统

#include <stdio.h>#include <stdlib.h>#include <string.h>typedef unsigned char  uint8_t;typedef unsigned short uint16_t;typedef unsigned int   uint32_t;#define STUDENT_NUMBER  20    // 学号最长20#define STUDENT_NAME    20    // 姓名最长20#define STUDENT_SUBJECT 3     // 假设只有三科#define FILENAME_SIZE   100   // 待保存的文件路径typedef struct student{  char num[STUDENT_NUMBER];       /* 学号 */  char name[STUDENT_NAME];        /* 姓名 */  char sex;                       /* 性别，'1'->男, '0'->女 */  uint8_t age;                    /* 年龄 */  uint8_t score[STUDENT_SUBJECT]; /* 三科的成绩 */  uint16_t sum;                   /* 总成绩 */  struct student *next;} student_t;student_t *head = NULL;static uint32_t count = 1; // 系统中学生个数void menu(){  PRintf("/n=========学生信息管理系统========/n");  printf("1. 录入学生信息/n");  printf("2. 显示所有学生信息/n");  printf("3. 按学号查询学生信息/n");  printf("4. 按姓名查询学生信息（支持模糊查询）/n");  printf("5. 按年龄查询学生信息/n");  printf("6. 修改学生信息/n");  printf("7. 删除学生信息/n");  printf("8. 保存学生信息到文件/n");  printf("9. 从文件载入学生信息/n");  printf("10. 退出系统/n");}// 录入学生信息:初始化链表和加入链表的过程void create(void){  int i, flag = 0;  char tmp[10];  student_t *point, *q;  while(1)  {    if(1 != count)    {      printf("是否继续录入(y/n):");      gets(tmp);      if(strlen(tmp) > 10)      {        break;      }      if(strcmp(tmp, "n") == 0)      {        break;      }    }    point = (student_t *)malloc(sizeof(student_t));    printf("/n====请输入第%d个学生信息====/n", count);    printf("学号：");    gets(point->num);    q = head;    while(NULL != q)    {      if(atoi(q->num) == atoi(point->num))      {        flag = 1;        printf("学号输入重复或者不合格，请重新输入.../n");        break;      }      q = q->next;    }    if(1 == flag)    {      continue;    }    printf("姓名：");    gets(point->name);    printf("性别，('1'->男, '0'->女)：");    point->sex = getchar();    getchar();    printf("年龄：");    gets(tmp);    point->age = atoi(tmp);    printf("三门课程的成绩：/n");    point->sum = 0;    for(i = 0; i < STUDENT_SUBJECT; ++i)    {      printf("第%d个成绩：", i + 1);      gets(tmp);      point->score[i] = atoi(tmp);      point->sum += point->score[i];    }    printf("总成绩：%d/n", point->sum);    point->next = head; // 核心代码就这两句    head = point;    count++;  }  printf("信息录入完毕，按任意键继续……");  getch();}// 显示所有学生的信息:遍历链表打印输出的过程void display_all(void){  student_t *point = head;  printf("学号/t姓名/t性别/t年龄/t三门课程的成绩/t/t总成绩/n");  while(NULL != point)  {    if(0 == point->age)    {      point = point->next;      continue;    }    printf("%s/t%s/t%s/t%d/t%d/t%d/t%d/t%d/n", point->num, point->name, point->sex == '1' ? "男" : "女", point->age, *(point->score), *(point->score + 1), *(point->score + 2), point->sum);    point = point->next;  }  printf("信息显示完毕，按任意键继续……");  getch();}// 通过学号查找:唯一性void search_on_number(void){  student_t *point = head;  char tmp[STUDENT_NUMBER];  uint8_t flag = 0;  printf("请输入学号：");  gets(tmp);  printf("学号/t姓名/t性别/t年龄/t三门课程的成绩/t/t总成绩/n");  while(NULL != point)  {    if(strcmp(tmp, point->num) == 0)    {      flag = 1;      printf("%s/t%s/t%s/t%d/t%d/t%d/t%d/t%d/n", point->num, point->name, point->sex == '1' ? "男" : "女", point->age, *(point->score), *(point->score + 1), *(point->score + 2), point->sum);    }    point = point->next;  }  if(0 == flag)  {    printf("/n未找到学号是%s的学生，按任意键继续……", tmp);  }  else  {    printf("/n显示完毕，按任意键继续……");  }  getch();}// 通过名字查找:不唯一void search_on_name(void){  student_t *point = head;  char tmp[STUDENT_NAME];  uint8_t flag = 0;  printf("请输入姓名：");  gets(tmp);  printf("学号/t姓名/t性别/t年龄/t三门课程的成绩/t/t总成绩/n");  while(NULL != point)  {    if(strstr(point->name, tmp))    {      flag = 1;      printf("%s/t%s/t%s/t%d/t%d/t%d/t%d/t%d/n", point->num, point->name, point->sex == '1' ? "男" : "女", point->age, *(point->score), *(point->score + 1), *(point->score + 2), point->sum);    }    point = point->next;  }  if(0 == flag)  {    printf("/n未找到学号是%s的学生，按任意键继续……", tmp);  }  else  {    printf("/n显示完毕，按任意键继续……");  }  getch();}// 通过年龄查找:不唯一void search_on_age(void){  student_t *point = head;  char tmp[30];  uint8_t flag = 0;  printf("请输入年龄：");  gets(tmp);  printf("学号/t姓名/t性别/t年龄/t三门课程的成绩/t/t总成绩/n");  while(NULL != point)  {    if(atoi(tmp) == point->age)    {      flag = 1;      printf("%s/t%s/t%s/t%d/t%d/t%d/t%d/t%d/n", point->num, point->name, point->sex == '1' ? "男" : "女", point->age, *(point->score), *(point->score + 1), *(point->score + 2), point->sum);    }    point = point->next;  }  if(flag == 0)  {    printf("/n未找到年龄是%s的学生，按任意键继续……", tmp);  }  else  {    printf("/n显示完毕，按任意键继续……");  }  getch();}// 修改指定学号的学生信息void modify(void){  student_t *point = head;  char tmp[STUDENT_NUMBER];  uint8_t flag = 0, j;  char a;  printf("请输入学号："); // 学号是唯一的  gets(tmp);  while(point != NULL)  {    if(strcmp(tmp, point->num) == 0)    {      flag = 1;      printf("学号/t姓名/t性别/t年龄/t三门课程的成绩/t/t总成绩/n");      printf("%s/t%s/t%s/t%d/t%d/t%d/t%d/t%d/n", point->num, point->name, point->sex == '1' ? "男" : "女", point->age, *(point->score), *(point->score + 1), *(point->score + 2), point->sum);      printf("/n====请输入新信息====/n");      // 学号唯一不做修改，别的都可以修改      printf("姓名：");      gets(tmp);      if(strcmp(tmp, "") != 0)      {        strcpy(point->name, tmp);      }      printf("性别，'1'->男, '0'->女：");      a = getchar();      if('/n' != a)      {        point->sex = a;      }      else      {        point->sex = '1'; // 默认男生      }      printf("年龄：");      gets(tmp);      if(strcmp(tmp, "") != 0)      {        point->age = atoi(tmp);      }      else      {        point->age = 20; // 默认就20岁了      }      printf("三门课程的成绩：/n");      point->sum = 0;      for(j = 0; j < STUDENT_SUBJECT; ++j)      {        printf("第%d科成绩：", j + 1);        gets(tmp);        if(strcmp(tmp, "") != 0)        {          point->score[j] = atoi(tmp);        }        point->sum += point->score[j];      }      printf("总成绩：%d/n", point->sum);    }    point = point->next;  }  if(0 == flag)  {    printf("/n未找到%s!按任意键继续……", tmp);  }  else  {    printf("/n修改完毕，按任意键继续……");  }  getch();}// 删除指定学生的信息:删除某个链表结点void delete(void){  student_t *point = head, *back;  char tmp[STUDENT_NUMBER];  uint8_t flag = 0, j;  char a;  printf("请输入学号："); // 学号是唯一的  gets(tmp);  while(1)  {    if(NULL == point->next)    {      break;    }    if(atoi(tmp) == atoi(point->num))    {      flag = 1;      head = point->next;      free(point);      count--;      break;    }    back = point;    point = point->next;    if(atoi(tmp) == atoi(point->num))    {      flag = 1;      back->next = point->next;      free(point);      count--;      break;    }  }  if(0 == flag)  {    printf("/n未找到%s!按任意键继续……", tmp);  }  else  {    printf("/n修改完毕，按任意键继续……");  }  getch();}// 保存到指定路径void save(void){  FILE *fp;  student_t *point = head;  char filename[FILENAME_SIZE] = {"d://QQ.dat"};  printf("请输入文件名如%s：", filename);  gets(filename);  while(strcmp(filename , "") == 0)  {    printf("文件名不能为空，请重新输入：");    gets(filename);  }  if((fp = fopen(filename, "wb")) == NULL)  {    printf("文件打开失败!/n按任意键继续……");    getch();    return;  }  printf("正在保存信息，请耐心等待……/n");  count = 0;  while(NULL != point)  {    count++;    fwrite(point, sizeof(student_t), 1, fp);    point = point->next;  }  fclose(fp);  printf("信息保存成功，按任意键继续……");  getch();}// 从指定文件读取学生的信息到链表void load(void){  FILE *fp;  student_t *point, *q;  char filename[FILENAME_SIZE] = {"d://qq.dat"};  printf("请输入文件名如%s：", filename);  gets(filename);  while(strcmp(filename , "") == 0)  {    printf("文件名不能为空，请重新输入：");    gets(filename);  }  if((fp = fopen(filename, "rb")) == NULL)  {    printf("文件打开失败!/n按任意键继续……");    getch();    return;  }  printf("正在从文件载入信息，请耐心等待……/n");  point = (student_t *)malloc(sizeof(student_t));  head = point;  count = 0;  while(!feof(fp))  {    count++;    fread(point, sizeof(struct student), 1, fp);    point->next = (student_t *)malloc(sizeof(student_t));    q = point;    point = point->next;  }  q->next = NULL;  fclose(fp);  printf("学生信息载入成功，按任意键继续……");  getch();}// 退出系统void quit(void){  char c;  printf("你真的要退出系统吗?(Y/N)");  c = getchar();  if('Y' == c || 'y' == c)  {    printf("系统退出成功.../n");    exit(0);  }}int main(void){  uint8_t value;  char choice[3];  while(1)  {    system("cls");    menu();    do    {      printf("请输入功能键：");      gets(choice);      value = atoi(choice);    }    while((value > 12) || (value < 0));    switch(value)    {    case 1:      create();      break;    case 2:      display_all();      break;    case 3:      search_on_number();      break;    case 4:      search_on_name();      break;    case 5:      search_on_age();      break;    case 6:      modify();      break;    case 7:      delete();      break;    case 8:      save();      break;    case 9:      load();      break;    case 10:      quit();      break;    default:      break;    }  }  return 0;}