C语言实现简单学生选课管理系统

#pragma once#define MAXN 50#define STU_F  "C://stu_cour_info_system//date//student.txt"  //文件存放路径及文件名#define COUR_F  "C://stu_cour_info_system//date//course.txt"  //文件存放路径及文件名#define MAN_F  "C://stu_cour_info_system//date//manager.txt"     //文件存放路径及文件名 #define STU_F_BACKUP  "C://stu_cour_info_system//backup//student.txt"  //备份文件存放路径及文件名#define COUR_F_BACKUP  "C://stu_cour_info_system//backup//course.txt"   //备份文件存放路径及文件名#define MAN_F_BACKUP  "C://stu_cour_info_system//backup//manager.txt"      //备份文件存放路径及文件名 struct student //学生信息结构体{ char name[MAXN];      //姓名 char num[MAXN];  //学号 char sch_cla[20];       //学院和班级 double score_all = 0; //应选总学分 double score_sel = 0; //已选课总学分 char password[9];  //学生登陆密码,共8位 int course_sum;  //选课总数 char course[50][MAXN];  //记录选课课程的编号 struct student *next;  //链表指针}; struct course //课程信息结构体{ char num[MAXN];  //课程编号 char name[MAXN];  //课程名称 char nature[MAXN];  //课程性质 char term[MAXN];  //开课学期 double time_all;    //总学时 double time_teach;   //授课学时 double time_exp;   //实验或上机学时 double score;    //该课程学分 int stu_max;   //能够容纳的学生总数 int stu_sum;   //已经选课学生总数 char stu[100][MAXN];  //已经选课学生学号 struct course *next;  //链表指针}; /*通用函数*/int judge_num(char *ch);         //用于检测输入的字符串ch是否全部为数字,全部为数字则返回1，否则返回0int input_num();          //用于输入数字，如果输入的全部为数字则返回该数字，否则一直停在输入状态double input_double();                                   //用于输入小数int input_limit(int n);         //输入选项，控制输入的数字范围为0-n,在这个范围内则返回该数字，否则一直停在输入状态int input_limit0(int n);int keyexam(char *actual_key, char *input_key);   //密码检测函数,x为密码位数，actul_key[]为真实密码,input_key为输入密码，密码匹配返回1否则返回0student* load_stu();          //将学生文件生成链表,返回链表头指针void store_stu(student *p_head);       //将学生链表存入学生文件,需传入链表头指针course* load_cour();          //将课程文件生成链表，返回链表头指针void store_cour(course *p_head);       //将课程链表存入课程文件，需传入链表头指针 student* locate_end(student *head);                         //传入头节点，返回尾节点course* locate_end(course *head);                          //传入头节点，返回尾节点void help();            //显示帮助信息int link_count(student* head);int link_count(course* head);        //计算链表节点数量int judge_ascii_num(char in[]);                             //检测输入是否全部为ASCII的数字，是返回1否则返回0             /*管理员函数*/int man_login();          //管理员登陆函数，密码正确返回1，否则返回0int man_menu();           //管理员主菜单，返回对应的输入值void student_add(student *head);        //增加学生的函数void student_delete(student *head);        //删除学生的函数void man_search_stu(student *head);        //搜索学生的函数void student_modify(student *head);       //管理员修改学生信息void course_add(course *head);        //增加课程的函数void course_delete(course *head);       //删除课程的函数void course_modify(course *head);       //修改课程信息的函数void print_all();                                     //打印所有学生和课程的函数void man_modifyKey();         //管理员修改密码void man_backups_recover();        //管理员备份和恢复数据void courseshowone_man(course *ad);     //管理员显示一门课程信息void courseshowall_man(course *ad);      //管理员显示所有课程信息           /*学生函数*/student* stu_login(student* head);       //学生登陆函数，学号和密码都正确则返回链表中该学生的指针，错误则返回nullint stu_menu();          //学生菜单，返回对应的输入值void student_showone(student *p);       //显示一个学生的信息void student_showall(student *head);      //显示所有学生的信息student *studentnamefind_char(student *head, char tar[]);   //根据学生姓名查找学生，如果学生为头节点则返回空指针，不为头节点则返回前一个节点的指针，不存在则返回尾节点student *studentnamefind_num(student *head, char tar[]);   //根据学生学号查找学生，如果学生为头节点则返回空指针，不为头节点则返回前一个节点的指针，不存在则返回尾节点void stu_modifyKey(student* stu);       //学生修改密码void coursechoose(course* head, student* stu);   //选课函数,min为最少要达到的学分void courseshow_nature(course *head);      //根据课程性质查找并显示课程信息void courseshow_term(course *head);      //根据开课学期查找并显示课程信息void cour_nat_te(course* head);                          //根据课程性质与开课学期组合查找课程信息void coursenumfindtip(course *head);      //查课子函数void coursenamefindtip(course *head);      //查课子函数2void stu_dele_cour(course* head, student* stu);    //删除已选课程           /*课程函数*/void course_showone(course *ad);       //显示一门的信息void course_showall(course *head);       //显示所有课程的信息void search_course(course *head);        //搜索课程的函数course *coursenamefind_char(course* head, char tar[]);    //根据课程名称查找课程节点，如果课程为头节点则返回空指针，不为头节点则返回前一个节点的指针，不存在则返回尾节点course *coursenumfind_num(course* head, char tar[]);    //根据课程编号查找课程，如果课程为头节点则返回空指针，不为头节点则返回前一个节点的指针，不存在则返回尾节点

#include<stdio.h>#include<string.h>#include<stdlib.h>#include"all.h" student* stu_head;course* cour_head;course *cour_tail; student *stu_tail;     //这四个指针是全局变量 int main(){ /*对四个指针变量初始化*/ stu_head = load_stu();    //stu_head指向学生链表头 stu_tail = locate_end(stu_head);  //stu_tail指向学生链表尾 cour_head = load_cour();   //cour_head指向课程链表头 cour_tail = locate_end(cour_head); //cour_tail指向课程链表尾  //{/*这段代码用于生成原始管理员密码:10个0； // 编译链接后执行一次然后注释掉*/ // FILE *fp = fopen(MAN_F, "w+"); // for (int i = 0; i < 10; i++) // { // fputc('0', fp); // } // fclose(fp);  //}   printf("/n/t/t--------------------------------欢迎使用选课系统！---------------------------------/n"); int status=-1; while (1)//判断登陆类型 { status = -1; printf("/n/n/t/t*****请选择登陆类型 [1]学生  [2]管理员  [3]显示帮助  [0]退出系统:"); status = input_limit0(3); if ((status == 0) || (status == 1) || (status == 2)||(status==3))  break; else  printf("/n/t/t##### 输入错误！只能选择1、2或0 #######/n"); }  while (1) { if (status == 2)//管理员登陆 {  if (man_login() == 1)  {  printf("/n/n/t/t-----------------------------------管理员登陆成功!--------------------------------/n/n");  int menu_return = man_menu();  while (1)  {   switch (menu_return)   {   case 1:   student_add(stu_head); break;   case 2:   student_delete(stu_head); break;   case 3:   student_modify(stu_head); break;   case 4:   man_search_stu(stu_head); break;   case 5:   course_add(cour_head); break;   case 6:   course_delete(cour_head); break;   case 7:   course_modify(cour_head); break;   case 8:   search_course(cour_head); break;   case 9:   print_all(); break;   case 10:   man_modifyKey(); break;   case 11:   man_backups_recover(); break;   case 0:   break;   default:   printf("/t/t/t#####输入错误，请重新输入######!/n");   }    if (menu_return == 0)   break;   menu_return = man_menu();  }  }  else  printf("/t/t######密码错误，请重新登陆!######/n"); }  else if (status == 1)//student login {  student* p_stu = stu_login(stu_head);  if (p_stu != NULL)//p_stu为指向该学生的指针  {  printf("/t/t*******请输入登陆密码:");  char input[100];  scanf("%s", input);  while (getchar() != '/n');  if (strcmp(p_stu->password, input) == 0)  {   printf("/n/n/t/t-----------------------------%s 欢迎进入选课系统! ---------------------------------/n/n", p_stu->name);   int menu_return = stu_menu();   while (1)   {   switch (menu_return)   {   case 1:    course_showall(cour_head); break;   case 2:    search_course(cour_head); break;   case 3:    coursechoose(cour_head,p_stu); break;   case 4:    stu_dele_cour(cour_head, p_stu); break;   case 5:    student_showone(p_stu); break;   case 6:    stu_modifyKey(p_stu); break;   case 0:    break;   default:    printf("/t/t######输入错误，请重新输入!######/n");   }    if (menu_return == 0)    break;   menu_return = stu_menu();   }  }  else  {   printf("/t/t#####密码错误，请重新登陆!#######/n");  }  }  else  printf("/t/t#####该学号不存在，请重新登陆!######/n");  p_stu = NULL; }  else if (status == 3)//显示帮助信息  help();  else if (status == 0)//关闭系统  return 0;   while (1)//再次判断登陆类型  {  status = -1;  printf("/n/n/t/t*****请选择登陆类型 [1]学生  [2]管理员  [3]显示帮助  [0]退出系统:");  status = input_limit0(3);  if ((status == 0) || (status == 1) || (status == 2) || (status == 3))   break;  else   printf("/n/t/t##### 输入错误！只能选择1、2或0 #######/n");  } }}

#include<stdio.h>#include<string.h>#include"all.h"#include<stdlib.h>#include<malloc.h>#include<ctype.h> extern student* stu_head;extern course* cour_head;extern course *cour_tail;extern student *stu_tail;  // 这四个指针变量在main.cpp中已经声明为全局变量 int keyexam(char *actual_key, char *input_key)//密码正确则返回1，否则返回0{ if (strcmp(actual_key, input_key) == 0) return 1; else return 0;} student* load_stu()//经调试已经正确{ int count = 0; FILE *fp; if ((fp = fopen(STU_F, "r")) == NULL) { printf("/t/tcannot open the file:STU_F/n"); exit(0); } student* temp = (student*)malloc(sizeof(student)); while (!feof(fp)) { if (fread(temp, sizeof(student), 1, fp))  count++; } free(temp); temp = NULL;  if (count == 0) return NULL; else { rewind(fp); student *p_head = NULL;//文件中有链表信息，则创建一个头指针 p_head = (student*)malloc(sizeof(student)); fread(p_head, sizeof(student), 1, fp);//用文件内容初始化链表节点 p_head->next = NULL; count--; student* p_new = p_head; student* p_end = p_head; for (int i = 0; i < count; i++) {  p_new = (student*)malloc(sizeof(student));  fread(p_new, sizeof(student), 1, fp);  p_new->next = NULL;  p_end->next = p_new;  p_end = p_new; } fclose(fp); return p_head; }} void store_stu(student * p_head)//经调试已正确{ FILE *fp; if ((fp = fopen(STU_F, "w")) == NULL)//以只写方式打开文件，覆盖以前数据 { printf("/t***STU_F missed,please quit the system and check for that!/n/n"); exit(0); } while (p_head != NULL)//将链表所有节点写入缓冲区 { fwrite(p_head, sizeof(student), 1, fp);//将链表一个节点写入缓冲区 p_head = p_head->next;      //p_head指向下一个节点 } fclose(fp);//保存文件，清空缓冲区} course * load_cour(){ int count = 0; FILE *fp; if ((fp = fopen(COUR_F, "r")) == NULL) { printf("/t/tcannot open the file:COUR_F/n"); exit(0); } course* temp = (course*)malloc(sizeof(course)); while (!feof(fp)) { if (fread(temp, sizeof(course), 1, fp))  count++; } free(temp); temp = NULL;  if (count == 0) return NULL; else { rewind(fp); course *p_head = NULL;//文件中有链表信息，则创建一个头指针 p_head = (course*)malloc(sizeof(course)); fread(p_head, sizeof(course), 1, fp);//用文件内容初始化链表节点 p_head->next = NULL; count--; course* p_new = p_head; course* p_end = p_head; for (int i = 0; i < count; i++) {  p_new = (course*)malloc(sizeof(course));  fread(p_new, sizeof(course), 1, fp);  p_new->next = NULL;  p_end->next = p_new;  p_end = p_new; } fclose(fp); return p_head; } } void store_cour(course * p_head){ FILE *fp; if ((fp = fopen(COUR_F, "w")) == NULL)//以只写方式打开文件，覆盖以前数据 { printf("/t***COUR_F missed,please quit the system and check for that!/n/n"); exit(0); } while (p_head != NULL)//将链表所有节点写入缓冲区 { fwrite(p_head, sizeof(course), 1, fp);//将链表一个节点写入缓冲区 p_head = p_head->next;      //p_head指向下一个节点 } fclose(fp);//保存文件，清空缓冲区} student * locate_end(student * head){ student* end = head; while (head != NULL) { end = head; head = head->next; } return end;} course* locate_end(course * head){ course* end = head; while (head != NULL) { end = head; head = head->next; } return end;} void help(){ int input = -1; while (1) { printf("/n/t/t*****请选择需要的帮助类型 [1]学生帮助 [2]管理员帮助 [3]版权信息 [0]返回主页:"); scanf("%d", &input); while (getchar() != '/n'); if (input == 0)  break; else if (input == 1)//学生使用说明 {  printf("/n/t/t--------------------------------学生使用说明---------------------------------------/n");  printf("/t/t密码：初始密码为学号，忘记密码请联系管理员/n");  printf("/t/t/n");  printf("/t/t/n");  printf("/t/t/n");  printf("/t/t-----------------------------------------------------------------------------------/n/n"); } else if (input == 2)//管理员使用说明 {  printf("/n/t/t-------------------------------管理员使用说明---------------------------------------/n");  printf("/t/t密码:初始密码为10个0，首次使用务必修改密码！/n");  printf("/t/t警告：该软件的文件夹必须放在C盘根目录下，否则不能使用！/n");  printf("/t/t提示：请定时备份数据，防止数据丢失!/n");  printf("/t/t提示：学生学号和课程编号只能是数字!/n");  printf("/t/t------------------------------------------------------------------------------------/n/n"); } else if (input == 3)//版权信息 {  printf("/n/t/t------------------------------版权信息-------------------------------------------------/n");  printf("/t/t软件名称：学生及课程信息管理系统/n");  printf("/t/t开发人员：焦智洋、文诗波、韩旭/n");  printf("/t/t版本：beta1.0/n");  printf("/t/t版权保护：版权所有，翻版必究/n");  printf("/t/t---------------------------------------------------------------------------------------/n/n"); } else  printf("/n/t/t#####输入错误，请重新输入！#####/n"); }} int link_count(student * head){ int count = 0; while (head != NULL) { count++; head = head->next; } return count;} int link_count(course * head){ int count = 0; while (head != NULL) { count++; head = head->next; } return count;} int judge_ascii_num(char in[]){ int i = 0; while (in[i]!='/0') { if ((in[i] < '0') || (in[i] > '9'))  return 0; i++; } return 1;} int judge_num(char *ch){ int sum = 0, len = strlen(ch); for (int i = 0; i < len; i++) { if (ch[i] >= '0'&&ch[i] <= '9')  sum++; } if (sum == len) return 1; else return 0;} int input_num(){ int num; char buf[MAXN]; while ((scanf("%s", buf) == 0) || (judge_num(buf) == 0)) { while (getchar() != '/n'); printf("/n/t/t###输入错误，请重新输入:"); } num = atoi(buf); return num;} double input_double(){ double temp = -1.00; while (1) { scanf("%lf", &temp); while (getchar() != '/n'); if (temp < 0)  printf("/n/t/t#####输入错误，请重新输入:"); else  break; } return temp;} double judge_input_dou(){ printf("/n/t/t是否修改该项？[1]修改  [0]不修改:"); int judge = 0; scanf("%d", &judge); while (getchar() != '/n'); if (judge == 1) { while (1) {  printf("/n/t/t请输入修改后的内容：");  double in = 0.00;  scanf("%lf", &in);  while (getchar() != '/n');  if (in<=0)  printf("/n/t/t#####输入错误，请重新输入！######");  else  {  return in;  break;  } } } else return -1.0;} course *coursenamefind_char(course* head, char tar[])//根据课程名称查找课程节点，返回前一节点地址{ course *p, *q; p = head; q = NULL; while (p != NULL) { if (strcmp(tar, p->name) == 0)  return q; q = p; p = p->next; } return q;} course *coursenumfind_num(course* head, char tar[])//根据课程编号查找课程{course *p, *q; p = head; q = NULL; while (p != NULL) { if (strcmp(tar, p->num)==0)  return q; q = p; p = p->next; } return q; } student *studentnamefind_char(student *head, char tar[]){ student *p, *q; p = head; q = NULL; while (p != NULL) { if (strcmp(tar, p->name) == 0)  return q; q = p; p = p->next; } return q;} student* studentnamefind_num(student *head, char tar[]){ student *p, *q; p = head; q = NULL; while (p != NULL) { if (strcmp(tar, p->num) == 0)  return q; q = p; p = p->next; } return q;} int input_limit(int n){ int m; while (1) { m = input_num(); if (m > 0 && m <= n)  break; printf("/n/t/t####无此选项，请重新输入!####/n"); } return m;} int input_limit0(int n){ int m; while (1) {  m = input_num();  if (m >= 0 && m <= n)  break;  printf("/n/t/t####无此选项，请重新输入!####/n"); } return m;} void student_showone(student *p){ printf("/n/t/t------------------------------------------------------"); printf("/n/t/t学号：%s", p->num); printf("/n/t/t姓名：%s", p->name); printf("/n/t/t学院与班级：%s", p->sch_cla); printf("/n/t/t密码：%s", p->password); if (p->course_sum == 0) printf("/n/t/t该学生无已选课程!/n"); else { printf("/n/t/t已选课程:/n"); for (int i = 0; i < p->course_sum; i++)  printf("/t/t/t[%d]:%s/n", i + 1, p->course[i]); } printf("/t/t选课总数：%d", p->course_sum); printf("/n/t/t已选课程总学分：%lf", p->score_sel); printf("/n/t/t已得学分统计：%lf", p->score_all); printf("/n/t/t------------------------------------------------------");} void student_showall(student *head){ student *p; p = head; while (p != NULL) { student_showone(p); p = p->next; }} void course_showone(course *ad){ if (ad == NULL) printf("/t/t无课程/n"); else { printf("/n/t/t------------------------------------------------------"); printf("/n/t/t课程名称：%s/n", ad->name); printf("/n/t/t课程编号：%s/n", ad->num); printf("/t/t课程性质：%s/n", ad->nature); printf("/t/t开课学期：%s/n", ad->term); printf("/t/t总学时:%lf/n", ad->time_all); printf("/t/t授课学时：%lf/n", ad->time_teach); printf("/t/t实验或上机学时：%lf/n", ad->time_exp); printf("/t/t学分：%lf/n/n", ad->score); printf("/n/t/t------------------------------------------------------"); }} void course_showall(course *head){ course *p; p = head; while (p != NULL) { course_showone(p); p = p->next; } return;} void cour_nat_te(course* head){ while (1) { printf("/n/t/t请输入要查找课程的性质，返回上级菜单请输入0000："); char input1[50]; scanf("%s", input1); while (getchar() != '/n'); if (strcmp(input1, "0000") == 0)  break;  printf("/n/t/t请输入要查找课程的开课学期:"); char input2[50]; scanf("%s", input2); while (getchar() != '/n');  int count = 0; while (head != NULL) {  if ((strcmp(input1, head->nature) == 0) && (strcmp(input2, head->term) == 0))  {  course_showone(head);  count++;  }  head = head->next; } if (count == 0)  printf("/n/t/t#####没有符合查找条件的课程！#####/n"); }} void search_course(course *head){ int flag; while (true) { flag = 0; printf("/n/t/t请输入查找条件 [1]课程编号  [2]课程名称  [3]课程性质/n/t/t[4]开课学期  [5]课程性质与开课学期  [0]返回上级菜单:"); scanf("%d", &flag); while (getchar() != '/n'); switch (flag) { case(1):coursenumfindtip(head); break; case(2):coursenamefindtip(head); break; case(3):courseshow_nature(head); break; case(4):courseshow_term(head); break; case(5):cour_nat_te(head); break; case(0):break; default:  printf("/n/t/t#####输入错误，请重新输入!#####"); } if (flag == 0)  break; }}

#include<stdio.h>#include<string.h>#include"all.h"#include<stdlib.h>#include<malloc.h>#include<ctype.h> extern student* stu_head;extern course* cour_head;extern course *cour_tail;extern student *stu_tail;  // 这四个指针变量在main.cpp中已经声明为全局变量 int man_login(){ FILE *fp; if ((fp = fopen(MAN_F, "r")) == NULL) { printf("/t/t#######无法找到文件：MAN_F######/n"); return -1; } char key[11]; fread(key, 10, 1, fp); key[10] = '/0'; fclose(fp); char input[1000]; printf("/t/t*******请输入管理员密码:"); scanf("%s", input); while (getchar() != '/n'); if (strcmp(input, key) == 0) return 1; else return 0;} int man_menu(){ printf("/n/t/t~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~管理员菜单~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"); printf("/n/t/t---[1]:添加学生"); printf("/n/t/t---[2]:删除学生"); printf("/n/t/t---[3]:修改学生信息"); printf("/n/t/t---[4]:查找学生信息/n"); printf("/n/t/t---[5]:添加课程"); printf("/n/t/t---[6]:删除课程"); printf("/n/t/t---[7]:修改课程信息"); printf("/n/t/t---[8]:查找课程信息/n"); printf("/n/t/t---[9]:打印所有课程/学生信息"); printf("/n/t/t---[10]:修改管理员密码"); printf("/n/t/t---[11]:数据备份与恢复"); printf("/n/t/t---[0]:注销/n"); printf("/n/t/t----请从<0-10>中选择操作类型:"); int n = input_limit0(11); return n;} void student_add(student *head) //增加学生的函数{ while (1) { char input[50]; while (1) {  printf("/n/t/t请输入要添加学生的学号(数字)，返回上级菜单请输入0000：");  scanf("%s", input);  while (getchar() != '/n');  if (judge_ascii_num(input) == 1)  break;  else  printf("/n/t/t####输入错误！#####"); } if (strcmp(input, "0000") == 0)  break; if (studentnamefind_num(stu_head, input) != stu_tail) {  printf("/t/t###已存在该学生,请重新输入!####/n");  continue; }  /*初始化学生信息*/ student* p = (student *)malloc(sizeof(student)); strcpy(p->num, input); printf("/t/t请输入学生姓名:"); scanf("%s", p->name); while (getchar() != '/n'); printf("/t/t请输入学生学院和班级(用--隔开):"); scanf("%s", p->sch_cla); while (getchar() != '/n'); printf("/t/t请输入当前该学生总学分:"); p->score_all = input_double(); p->course_sum = 0; p->score_sel = 0.0; strcpy(p->password, p->num);  if (stu_head == NULL)//当前链表中没有节点 {  p->next = NULL;  stu_head = p;  stu_tail = p; } else {  if (strcmp(p->num, stu_head->num) < 0)//新增节点的标号比头节点还小  {  p->next = stu_head;  stu_head = p;  }  else if (strcmp(p->num, stu_tail->num) > 0)//新增节点的标号比尾节点还大  {  p->next = NULL;  stu_tail->next = p;  stu_tail = p;  }  else//新增节点的标号在头节点和尾节点之间  {  student* temp = stu_head;  while (temp != stu_tail)  {   if (strcmp(p->num, temp->num) > 0)   {   p->next = temp->next;   temp->next = p;   break;   }  }  } } printf("/n/t/t学生信息录入成功!/n"); }  store_stu(stu_head);} void student_delete(student *head){ while (true) { printf("/n/t/t请输入要删除学生的学号或姓名,取消删除请输入0000:"); char input[50]; scanf("%s", input); while (getchar() != '/n'); if (strcmp(input, "0000") == 0)  break;  student *p; if ((input[0] >= 48) && (input[0] <= 57))  p = studentnamefind_num(stu_head, input); else  p = studentnamefind_char(stu_head, input);  if (p == stu_tail)//没有该学生 {  printf("/n/t/t####没有该学生信息!#####");  continue; }  printf("/n/t/t确定删除%s？[1]是 [0]否:", input); int in = 0; scanf("%d", &in); while (getchar() != '/n'); if (in == 1) {  if (p == NULL)//链表头节点  {  if (stu_head->next == NULL)  {   stu_tail = NULL;  }  student* temp = stu_head;  stu_head = stu_head->next;  free(temp);  temp = NULL;  }  else if (p->next == stu_tail)//链表尾节点  {  p->next = NULL;  free(stu_tail);  stu_tail = p;  }  else//链表中间节点  {  student* delete_point = p->next;  p->next = delete_point->next;  free(delete_point);  delete_point = NULL;  }  printf("/n/t/t已经删除该学生的信息！/n"); } else  printf("/n/t/t####未删除该学生的信息!####/n"); }  store_stu(stu_head);} void student_modify(student *head){ char input[100]; student* find = NULL; while (1) { printf("/t/t请输入要修改学生的学号或姓名,取消修改请输入0000:"); scanf("%s", input); while (getchar() != '/n'); if (strcmp(input, "0000") == 0)  break; if ((input[0] >= 48) && (input[0] <= 57))//按学号查找  find = studentnamefind_num(head, input); else//按姓名查找  find = studentnamefind_char(head, input); if (find == stu_tail) {  printf("/n/t/t####你所查找的学生不存在！");  continue; } else {  char temp[50];  if (find == NULL)  find = head;  else  find = find->next;  printf("/n/t/t请分别输入需要修改的内容，若某一项不需要修改请输入0");   printf("/n/t/t原姓名:%s  修改后的姓名：", find->name);  scanf("%s", &temp);  while (getchar() != '/n');  if (strcmp(temp, "0") != 0)  strcpy(find->name, temp);   printf("/t/t原学院和班级:%s  修改后的学院和班级(中间用--隔开)：", find->sch_cla);  scanf("%s", &temp);  while (getchar() != '/n');  if (strcmp(temp, "0") != 0)  strcpy(find->sch_cla, temp);   printf("/t/t原密码:%s  修改后的密码:", find->password);  scanf("%s", &temp);  while (getchar() != '/n');  if (strcmp(temp, "0") != 0)  strcpy(find->password, temp);   printf("/t/t原总学分:%lf  (增加学分请使用+,减少学分请使用-,例如“-10” “+10”):", find->score_all);  scanf("%s", &temp);  while (getchar() != '/n');  if (strcmp(temp, "0") != 0)  {  int change = (int)temp[0];  temp[0] = '0';  double number = atof(temp);  if (change == 43)   find->score_all += number;  else if (change == 45)   find->score_all -= number;  }   printf("/t/t修改完成！/n/n"); } }  store_stu(stu_head);} void course_add(course *head){ while (1) { char input[50]; while (1) {  printf("/n/t/t请输入要添加课程的编号，返回上一级菜单请输入0000：");  scanf("%s", input);  while (getchar() != '/n');  if (judge_ascii_num(input) == 1)  break;  else  printf("/n/t/t#####输入错误！####"); } if (strcmp(input, "0000") == 0)  break;  if (coursenumfind_num(cour_head, input) != cour_tail) {  printf("/t/t###已存在该课程,请重新输入!####/n");  continue; }  course* p = (course*)malloc(sizeof(course)); /*初始化课程信息*/ strcpy(p->num, input); printf("/n/t/t请输入课程名称："); scanf("%s", p->name); while (getchar() != '/n'); printf("/n/t/t请输入课程性质:"); scanf("%s", p->nature); while (getchar() != '/n'); printf("/n/t/t请输入课程总学时:"); p->time_all = input_double(); printf("/n/t/t请输入课程授课学时:"); p->time_teach = input_double(); printf("/n/t/t请输入课程实验或上机学时:"); p->time_exp = input_double(); printf("/n/t/t请输入课程最大容纳人数:"); p->stu_max = input_num(); printf("/n/t/t请输入课程学分:"); p->score = input_double(); printf("/n/t/t请输入课程开课学期:"); scanf("%s", p->term); while (getchar() != '/n'); p->stu_sum = 0;  if (cour_head == NULL)//链表中没有节点 {  p->next = NULL;  cour_head = p;  cour_tail = p; } else {  if (strcmp(p->num, cour_head->num) < 0)//新增节点的标号比头节点还小  {  p->next = cour_head;  cour_head = p;  }  else if (strcmp(p->num, cour_tail->num) > 0)//新增节点的标号比尾节点还大  {  p->next = NULL;  cour_tail->next = p;  cour_tail = p;  }  else//新增节点的标号在头节点和尾节点之间  {  course* temp = cour_head;  while (temp != cour_tail)  {   if (strcmp(p->num, temp->num) > 0)   {   p->next = temp->next;   temp->next = p;   break;   }  }  } } printf("/n/t/t课程信息录入成功!/n"); } store_cour(cour_head);} void course_delete(course *head){ course *p; char input[50]; while (true) { printf("/n/t/t请输入要删除课程的编号或名称,取消删除请输入0000:"); scanf("%s", input); while (getchar() != '/n'); if (strcmp(input, "0000") == 0)  break; if ((input[0] >= 48) && (input[0] <= 57))  p = coursenumfind_num(head, input); else  p = coursenamefind_char(head, input);  if (p == cour_tail)//没有该课程 {  printf("/n/t/t####没有该课程信息!####"); continue; }  printf("/n/t/t确定删除%s？[1]是 [0]否:", input); int in = 0; scanf("%d", &in); while (getchar() != '/n'); if (in == 1) {  if (p == NULL)//链表头节点  {  if (head->next == NULL)   cour_tail = NULL;  course* temp = head;  head = head->next;  cour_head = head;  free(temp);  }  else if (p->next == cour_tail)//链表尾节点  {  free(cour_tail);  p->next = NULL;  cour_tail = p;  }  else//链表中间节点  {  course* delete_point = p->next;  p = (p->next)->next;  free(delete_point);  }  printf("/n/t/t%s已经删除！/n", input); } else  printf("/n/t/t#####未删除课程%s的信息!######/n", input); } store_cour(cour_head);} void course_modify(course *head){ char input[100]; course* find = NULL; while (1) { printf("/t/t请输入要修改课程的编号号或名称,取消修改请输入0000:"); scanf("%s", input); while (getchar() != '/n'); if (strcmp(input, "0000") == 0)  break; if ((input[0] >= 48) && (input[0] <= 57))//按学号查找  find = coursenumfind_num(head, input); else//按姓名查找  find = coursenamefind_char(head, input); if (find == cour_tail) {  printf("/n/t/t####你所查找的课程不存在！####");  continue; } else {  char temp[50];  if (find == NULL)  find = head;  else  find = find->next;  printf("/n/t/t请分别输入需要修改的内容，若某一项不需要修改请输入0");   printf("/n/t/t原名称:%s     修改后的名称：", find->name);  scanf("%s", &temp);  while (getchar() != '/n');  if (strcmp(temp, "0") != 0)  strcpy(find->name, temp);   printf("/t/t原性质:%s     修改后的性质：", find->nature);  scanf("%s", &temp);  while (getchar() != '/n');  if (strcmp(temp, "0") != 0)  strcpy(find->nature, temp);   printf("/t/t原开课学期:%s     修改后的开课学期：", find->term);  scanf("%s", &temp);  while (getchar() != '/n');  if (strcmp(temp, "0") != 0)  strcpy(find->term, temp);   //int time_all;    //总学时  //int time_teach;   //授课学时  //int time_exp;   //实验或上机学时  //int score;    //该课程学分  //int stu_max;   //能够容纳的学生总数   printf("/t/t原总学时:%lf     修改后的总学时：", find->time_all);  scanf("%s", &temp);  while (getchar() != '/n');  if (strcmp(temp, "0") != 0)  find->time_all = atof(temp);   printf("/t/t原授课学时:%lf     修改后的授课学时：", find->time_teach);  scanf("%s", &temp);  while (getchar() != '/n');  if (strcmp(temp, "0") != 0)  find->time_teach = atof(temp);   printf("/t/t原实验或上机学时:%lf     修改后的实验或上机学时：", find->time_exp);  scanf("%s", &temp);  while (getchar() != '/n');  if (strcmp(temp, "0") != 0)  find->time_exp = atof(temp);   printf("/t/t原课程学分:%lf     修改后的课程学分：", find->score);  scanf("%s", &temp);  while (getchar() != '/n');  if (strcmp(temp, "0") != 0)  find->score = atof(temp);   printf("/t/t原能容纳学生总数:%d     修改后的能容纳学生总数：", find->stu_max);  scanf("%s", &temp);  while (getchar() != '/n');  if (strcmp(temp, "0") != 0)  find->stu_max = atoi(temp);   printf("/t/t修改完成！/n/n"); } }  store_cour(cour_head);} void print_all(){ while (1) { printf("/n/t/t选择操作类型: [1]打印所有学生信息  [2]打印所有课程信息 [0]返回主菜单:"); int input = 0; scanf("%d", &input); while (getchar() != '/n'); if (input == 1) {  printf("/n/t/t学生总数：%d", link_count(stu_head));  student_showall(stu_head); } else if (input == 2) {  printf("/n/t/t课程总数：%d/n", link_count(cour_head));  courseshowall_man(cour_head); } else if (input == 0)  break; else  printf("/n/t/t####输入错误！请重新输入!#####/n"); }} void man_modifyKey(){ printf("/t/t******请输入原密码(10位):"); char input[20]; scanf("%s", input); while (getchar() != '/n');  FILE *fp; if ((fp = fopen(MAN_F, "r")) == NULL) { printf("/t/t-------- 无法打开文件:MAN_F/n"); exit(0); } char keyOld[11]; fread(keyOld, 10, 1, fp); keyOld[10] = '/0'; if (strcmp(keyOld, input) == 0)//修改 { fclose(fp); char new1[100]; char new2[100]; while (1) {  printf("/t/t*******请输入新密码（10位）:");  scanf("%s", new1);  while (getchar() != '/n');  printf("/t/t******请再次确认新密码（10位）:");  scanf("%s", new2);  while (getchar() != '/n');  if (keyexam(new1, new2) == 1)  {  fp = fopen(MAN_F, "w");  fwrite(new1, 10, 1, fp);  fclose(fp);  printf("/n/t/t------密码修改成功!/n");  break;  }  else  printf("/t/t####前后密码不一致，请重新输入！####/n"); } } else { fclose(fp); printf("/t/t####原密码输入错误，请重新选择操作类型####/n"); }} void man_backups_recover(){ printf("/t/t*****[1]数据备份 [2]数据恢复 [3]取消/n"); printf("/t/t*****选择操作类型:"); int input = 0; scanf("%d", &input); while (getchar() != '/n'); if (input == 1) { FILE *fp_source; FILE *fp_destination; {//课程信息备份  if ((fp_source = fopen(COUR_F, "r")) == NULL)  {  printf("/t/t##课程数据备份失败：无法找到COUR_F文件！##/n");  exit(0);  }  fp_destination = fopen(COUR_F_BACKUP, "w");  char temp;  int count = 0;  while (!feof(fp_source))  {  if (fread(&temp, 1, 1, fp_source))   count++;  }  rewind(fp_source);  for (int i = 0; i < count; i++)  {  fread(&temp, 1, 1, fp_source);  fwrite(&temp, 1, 1, fp_destination);  }  fclose(fp_destination);  fclose(fp_source); } {//学生信息备份  if ((fp_source = fopen(STU_F, "r")) == NULL)  {  printf("/t/t##学生数据备份失败：无法找到STU_F文件！##/n");  exit(0);  }  fp_destination = fopen(STU_F_BACKUP, "w");  char temp;  int count = 0;  while (!feof(fp_source))  {  if (fread(&temp, 1, 1, fp_source))   count++;  }  rewind(fp_source);  for (int i = 0; i < count; i++)  {  fread(&temp, 1, 1, fp_source);  fwrite(&temp, 1, 1, fp_destination);  }  fclose(fp_destination);  fclose(fp_source); } {//管理员信息备份  if ((fp_source = fopen(MAN_F, "r")) == NULL)  {  printf("/t/t##管理员数据备份失败：无法找到MAN_F文件！##/n");  exit(0);  }  fp_destination = fopen(MAN_F_BACKUP, "w");  char temp;  for (int i = 0; i < 10; i++)  {  fread(&temp, 1, 1, fp_source);  fwrite(&temp, 1, 1, fp_destination);  }  fclose(fp_destination);  fclose(fp_source); } printf("/n/t/t所有数据已经备份完毕！备份目录为C:/ stu_cour_info_system/backup/n"); } else if (input == 2) { printf("/t/t选择恢复类型:[1]课程数据  [2]学生数据 [3]管理员数据:"); int in = 0; scanf("%d", &in); while (getchar() != '/n'); FILE *fp_source; FILE *fp_destination; if (in == 1)//course information recover {  //课程信息恢复  if ((fp_source = fopen(COUR_F_BACKUP, "r")) == NULL)  {  printf("/t/t###课程信息恢复失败！未能找到C://stu_cour_info_system//backup//course_back.txt###/n");  exit(0);  }  fp_destination = fopen(COUR_F, "w");  char temp;  int count = 0;  while (!feof(fp_source))  {  if (fread(&temp, 1, 1, fp_source))   count++;  }  rewind(fp_source);  for (int i = 0; i < count; i++)  {  fread(&temp, 1, 1, fp_source);  fwrite(&temp, 1, 1, fp_destination);  }  fclose(fp_destination);  fclose(fp_source);  printf("/n/t/t课程信息恢复成功！/n");  cour_head = load_cour();  cour_tail = locate_end(cour_head); } else if (in == 2)//student information recover { //学生信息恢复  if ((fp_source = fopen(STU_F_BACKUP, "r")) == NULL)  {  printf("/t/t###学生信息恢复失败！未能找到C://stu_cour_info_system//backup//student_back!###/n");  exit(0);  }  fp_destination = fopen(STU_F, "w");  char temp;  int count = 0;  while (!feof(fp_source))  {  if (fread(&temp, 1, 1, fp_source))   count++;  }  rewind(fp_source);  for (int i = 0; i < count; i++)  {  fread(&temp, 1, 1, fp_source);  fwrite(&temp, 1, 1, fp_destination);  }  fclose(fp_destination);  fclose(fp_source);  printf("/n/t/t学生数据恢复成功！/n");  stu_head = load_stu();  stu_tail = locate_end(stu_head); } else if (in == 3)//manager information recover {  //恢复管理员数据  if ((fp_source = fopen(MAN_F_BACKUP, "r")) == NULL)  {  printf("/t/t###管理员数据恢复失败！未能找到C://stu_cour_info_system//backup//course_back/n");  exit(0);  }  fp_destination = fopen(MAN_F, "w");  char temp;  for (int i = 0; i < 10; i++)  {  fread(&temp, 1, 1, fp_source);  fwrite(&temp, 1, 1, fp_destination);  }  fclose(fp_destination);  fclose(fp_source);  printf("/n/t/t管理员数据恢复成功！/n"); } else  printf("/t/t###输入错误！###/n"); } else if (input == 3) ; else printf("/t/t###输入错误，请重新输入!####/n");} void man_search_stu(student *head){ while (1) { printf("/n/t/t请输入学号或姓名进行查找，返回上级菜单请输入0000："); char input[50]; scanf("%s", input); while (getchar() != '/n'); if (strcmp(input, "0000") == 0)  break;  student* p_stu; if ((input[0] >= 48) && (input[0] <= 57))  p_stu = studentnamefind_num(head, input); else  p_stu = studentnamefind_char(head, input);  if (p_stu == stu_tail) {  printf("/n/t/t#####没有该学生的信息，请重新输入！#####/n");  continue; }  if (p_stu == NULL)  p_stu = head; else  p_stu = p_stu->next;  printf("/n/t/t该学生信息如下："); student_showone(p_stu); }} void courseshowone_man(course *ad){ if (ad == NULL) printf("无课程"); else { printf("/n/t/t------------------------------------------------------"); printf("/n/t/t课程编号：%s/n", ad->num); printf("/t/t课程名称：%s/n", ad->name); printf("/t/t课程性质：%s/n", ad->nature); printf("/t/t开课学期：%s/n", ad->term); printf("/t/t总学时:%lf/n", ad->time_all); printf("/t/t授课学时：%lf/n", ad->time_teach); printf("/t/t实验或上机学时：%lf/n", ad->time_exp); printf("/t/t学分：%lf/n", ad->score); printf("/t/t总容纳学生人数：%d/n", ad->stu_max); printf("/t/t已选学生人数：%d/n", ad->stu_sum); printf("/t/t已选学生：/n"); if (ad->stu_sum == 0)  printf("/t/t没有人选该课程/n"); else  for (int i = 0; i <ad->stu_sum; i++)  {  if (i % 5 == 0)   printf("/t/t");  student* temp = studentnamefind_num(stu_head, ad->stu[i]);  if (temp == NULL)   temp = stu_head;  else   temp = temp->next;  printf("[%d] %s", i + 1, temp->name);  if (i > 0 && i % 5 == 0)   printf("/n");  } printf("/n/t/t------------------------------------------------------"); }} void courseshowall_man(course *head){  course *p; p = head; if (p == NULL) { printf("/t/t无课程/n"); return; } while (p != NULL) { courseshowone_man(p); p = p->next; }}

#include<stdio.h>#include<string.h>#include"all.h"#include<stdlib.h>#include<malloc.h>#include<ctype.h> extern student* stu_head;extern course* cour_head;extern course *cour_tail; extern student *stu_tail;// 这四个指针变量在main.cpp中已经声明为全局变量 student* stu_login(student* head){ student* copy_head = head; char input[100]; printf("/t/t*******请输入学号:"); scanf("%s", input); while (getchar() != '/n'); student* temp; temp = studentnamefind_num(head, input); if (temp == NULL)//the first student return copy_head; else if ((temp != NULL) && (temp->next == NULL))//no such a student return NULL; else return temp->next;} int stu_menu(){ printf("/n/t/t~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~学生菜单~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"); printf("/n/t/t---[1]:打印课程信息"); printf("/n/t/t---[2]:查找课程信息"); printf("/n/t/t---[3]:选择新的课程"); printf("/n/t/t---[4]:删除已选课程"); printf("/n/t/t---[5]:查看个人信息"); printf("/n/t/t---[6]:修改登陆密码"); printf("/n/t/t---[0]:注销"); printf("/n/n/t/t---请从<0-6>中选择操作类型:"); int n = input_limit0(6); return n;} void courseshow_nature(course *head){  course *p; char ad[MAXN]; while (true) { int flag = 0, sum = 0; p = head; printf("/t/t请输入要查找课程的性质,取消查找请输入0000:"); scanf("%s", ad); while (getchar() != '/n'); if (strcmp(ad, "0000") == 0)  break; while (p != NULL) {  if (strcmp(ad, p->nature) == 0)  {  course_showone(p);  flag = 1;  sum++;  }  p = p->next; } if (flag == 0)  printf("/n/t/t没有该课程！####"); } return;} void courseshow_term(course *head){  course *p; char ad[MAXN]; while (true) { int flag = 0, sum = 0; p = head; printf("/t/t请输入要查找课程的开课学期,取消查找请输入0000:"); scanf("%s", ad); while (getchar() != '/n'); if (strcmp(ad, "0000") == 0)  break; while (p != NULL) {  if (strcmp(ad, p->term) == 0)  {  course_showone(p);  flag = 1;  sum++;  }  p = p->next; } if (flag == 0)  printf("/n/t/t#####没有该课程!#####"); } return;} void coursechoose( course* head, student* stu)//选课函数{ if (stu->score_sel <stu->score_all ) printf("/n/t/t你的总学分少于%lf,赶快去选课吧！/n", stu->score_all); while (1) { printf("/n/t/t请输入课程的编号或名称进行选课，取消选课请输入0000:"); char input[50]; scanf("%s", input); while(getchar()!='/n'); if (strcmp(input, "0000")==0)  break; course* find = NULL; if ((input[0] >= 48) && (input[0] <= 57))  find = coursenumfind_num(head, input); else  find = coursenamefind_char(head, input);  if (find == cour_tail) {  printf("/n/t/t#####该课程不存在!请重新输入#####/n");  continue; } else if (find == NULL)  find = head; else  find = find->next;  if (find->stu_sum == find->stu_max)  printf("/n/t/t####该课程人数已满,无法选择!#####/n"); else {  int judge = 0;  for (int i = 0; i < stu->course_sum; i++)  {  if (strcmp(stu->course[i], find->num)==0)  {judge = 1; break;}  }  if (judge == 1)  {  printf("/n/t/t####该课程已经选择过了!####/n");  continue;  }  else  {  stu->course_sum++;  strcpy(stu->course[stu->course_sum - 1], find->num);  stu->score_sel += find->score;   find->stu_sum++;  strcpy(find->stu[find->stu_sum - 1], stu->num);  printf("/n/t/t该课程选择成功!/n");  } }  }  store_cour(cour_head); store_stu(stu_head);} void coursenumfindtip(course *head){ char buf[MAXN]; course *result; while (true) {  printf("/t/t请输入要查找课程的编号,取消查找请输入0000:"); scanf("%s", buf); while (getchar() != '/n'); if (strcmp(buf, "0000") == 0)  break; result = coursenumfind_num(head, buf); if (result != cour_tail) {  if (result == NULL)  result = head;  else  result = result->next;  course_showone(result); } else  printf("/t/t#####没有该课程！#####/n"); }} void coursenamefindtip(course *head){ char buf[MAXN]; course *result; while (1) { printf("/t/t请输入要查找课程的名称,取消查找请输入0000:"); scanf("%s", buf); while (getchar() != '/n'); if (strcmp(buf, "0000") == 0)  break; result = coursenamefind_char(head, buf); if (result != cour_tail) {  if (result == NULL)  result = head;  else  result = result->next;  course_showone(result); } else  printf("/t/t#####无所查找的课程!#####/n"); }} void stu_dele_cour( course * head, student * stu){ while (1) { printf("/n/t/t请输入需要删除课程的编号,返回上级菜单请输入0000:"); char input[50]; scanf("%s", input); while (getchar() != '/n'); if (strcmp(input, "0000") == 0)  break; int i = 0, result = -1;  /*删除该学生记录中选课的信息*/ for (; i < stu->course_sum; i++) {  if (strcmp(input, stu->course[i]) == 0)  { result = i; break; } } if (result == -1)  {printf("/n/t/t####你没有选择这门课程！请重新输入!");continue;} strcpy(stu->course[result], stu->course[stu->course_sum - 1]); stu->course_sum--;     course* find= coursenumfind_num(head, input); if (find == NULL)  find = head; else  find =find->next;  /*删除该课程记录中学生的信息*/ i = 0, result = 0; for (; i < find->stu_sum; i++) {  if(strcmp(input,find->stu[i])==0)  { result = i; break;} } strcpy(find->stu[result], find->stu[find->stu_sum - 1]); find->stu_sum --;                              printf("/n/t/t课程删除成功!/n"); }  store_stu(stu_head); store_cour(cour_head);} void stu_modifyKey(student* stu){ printf("/t/t******请输入原密码(8位):"); char input[20]; scanf("%s", input); while (getchar() != '/n');  char keyOld[10]; strcpy(keyOld, stu->password); if (keyexam(keyOld, input) == 1)//修改 { char new1[100]; char new2[100]; while (1) {  printf("/t/t*******请输入新密码（8位）:");  scanf("%s", new1);  while (getchar() != '/n');  printf("/t/t******请再次确认新密码（8位）:");  scanf("%s", new2);  while (getchar() != '/n');  if (keyexam(new1, new2) == 1)  {  strcpy(stu->password, new1);  store_stu(stu_head);  printf("/n/t/t------密码修改成功!/n");  break;  }  else  printf("/t/t####前后密码不一致，请重新输入！####/n"); } } else printf("/t/t####原密码输入错误，请重新选择操作类型####/n");}