C++实现学生选课系统

#include <iostream>#include <iomanip> #include <fstream>#include<Windows.h>#include<cstring>using namespace std;struct SubList/*某个学生所学的课程中的某一个 */{ int num; /*课程代号 */ SubList *next;  /*指向下一个课程的指针*/ SubList() :num(-1), next(NULL){} /*构造函数*/};struct StuList /*课程中所选的学生*/{ int num;   /* 学生的学号*/ float score;   /*学生所得的该课程分数*/ StuList *next; /*下一个学生*/ StuList() :num(-1), score(0), next(NULL){}};class Student {private: int Num;  /*学号*/ char Name[20];    /*学生的姓名 */ int MaxSubNum;   /*学生最多可以学五门课程 */ int FactSubNum;   /* 学生实际所学的课程数目 */ SubList *Root;   /*课程的指针*/ float SumXueFen; /*总的选课学分*/ float FactXueFen; /*实际获得学分*/ float SumGrade; /*总成绩*/ bool Update; /*是否需要更新信息*/public: Student *next;/*让所有学生的信息连接起来*/ SubList *GetSubPtr()const{ return Root; }/*获取所选的课程表*/ Student() :Update(false), Root(new SubList()), FactXueFen(0), MaxSubNum(5), FactSubNum(0), SumXueFen(0), SumGrade(0),next(NULL){} void SetName(char N[]){ strcpy(Name, N); } /* 设置学生的姓名 */ void SetNum(int num){ Num = num; } /*设置学号*/ const char* GetName()const{ return Name; }/*得到学生的姓名 */ int GetNum()const{ return Num; } /*得到学号*/ int GetFactSubNum()const{ return FactSubNum; } /*得到实际选课数*/ bool FindSub(int num)const;  /*查找是否已有此课程,如果有返回,如果没有返回 */ void SetInfo(float sumXueFen, float factXueFen, float sumGrade) { SumXueFen = sumXueFen;/*这三条信息因为一起用 所以一起设置了*/ FactXueFen = factXueFen; SumGrade = sumGrade; } void SetUpdate(bool t){ Update = t; }/*是否更新信息的标志*/ float GetAveGrade(){ return SumGrade / FactSubNum; }  /*学生课程的平均成绩*/ void AddSub(int num); /*增加课程*/ bool IsFull()const{ return MaxSubNum == FactSubNum; } void ShowStuInfo(); /*输出学生信息*/ void DelSub(int num); /*删除课程 Manage类使用*/ ~Student()/*析构函数 不要也行影响不太大 一般程序，还不太会内存用完*/ { SubList *p = Root; while (p) {  SubList*t = p->next;  delete p;  p = t; } }};//课程类 class Subject{private: int MaxStuNum;  /*最多学生数*/ int FactStuNum;  /*实际学生数*/ float Credit;  /*该课程的学分 */ char Name[20]; /* 该课程的名称 */ int Num; /*课程的代号*/ StuList *Root; /* 学生名单 */ float AveGrade; /*该课程的平均成绩 */ bool Update; /*是否更新信息*/public: StuList *GetStuPtr()const{ return Root; }/*获取选此课程的学生表*/ Subject*next; Subject() :Root(new StuList()), MaxStuNum(30), FactStuNum(0), Update(false),next(NULL){} float GetCredit()const{ return Credit; }  //得到课程的学分  void SetCredit(float credit){ Credit = credit; } //设置学分 const char* GetName()const{ return Name; } //读出课程的名称 void SetName(char N[]){ strcpy(Name, N); } //设置课程的名称 int GetNum()const{ return Num; } //读出课程的代号 void SetNum(int num){ Num = num; } //设置课程的代号 int GetFactStuNum()const{ return FactStuNum; } //返回实际学生数  int GetMaxStuNum()const{ return MaxStuNum; }//最大学生数 void SetUpdate(bool t){ Update = t; } void SetAveGrade(float num){ AveGrade = num/FactStuNum; } //设置平均分 float GetAveGrade(){ return AveGrade; }  //得到学生的平均成绩 float GetStuScore(int num); //查找某个学生的成绩 bool IsFull()const{ return MaxStuNum == FactStuNum; }//是否人数已满 void DelStu(int num);//删除学生 void AddStu(int num);//增加学生 ~Subject() { StuList *p = Root; while (p) {  StuList*t = p->next;  delete p;  p = t; } }};float Subject::GetStuScore(int num){ StuList*p = Root->next; while (p->num != num) p = p->next; return p->score;}void Student::ShowStuInfo(){ cout << Num << " " << Name << " " << "选课数：" << FactSubNum << endl; cout << "/t/t 总成绩" << SumGrade << " 平均分" << GetAveGrade() << endl; cout << "/t/t课程总学分" << SumXueFen << " 获得学分" << FactXueFen << endl;  system("pause");}bool Student::FindSub(int num)const//查找是否已有此课程,如果有返回,如果没有返回{ bool t = false; SubList *p = Root->next; while (!t && p) { if (p->num == num)  t = true; p = p->next; } return t;}void Student::AddSub(int num)//给学生增加一门课 { SubList *s = new SubList(), *p = Root; while (p->next) p = p->next; p->next = s; s->num = num; FactSubNum++; Update = true;}void Student::DelSub(int num){ SubList*p = Root, *t; while (p->next->num != num) p = p->next; t = p->next; p->next = t->next; FactSubNum--; Update = true; delete t;}//////////////////////////Subject//////////////////////////////////void Subject::AddStu(int num)// { StuList *s = new StuList(), *p = Root; while (p->next) p = p->next; p->next = s; s->num = num; FactStuNum++; Update = true;}void Subject::DelStu(int num){ StuList*p = Root, *t; while (p->next->num != num) p = p->next; t = p->next; p->next = t->next; FactStuNum--; Update = true; delete t;}//////////////////////////////////////////////////////////class Manage{private: Student*StuRoot; Subject*SubRoot; bool Update;public: Manage() :StuRoot(new Student()), SubRoot(new Subject()),Update(false){} Manage(const Manage&p){} void AddStu(); void AddSub(); Student*FindStu(int num); Subject*FindSub(int num); int ShowSub()const;//显示可选课程 int ShowStu()const; void ShowStuSubInfo(Student*p); void DelStu(Student*p); void DelSub(Subject*p); void Start(); int menu(); int custom(); int server(); Student* password1(); bool password2(); void menu_1_1(Student*p); void menu_2_1(); void menu_2_2(); void menu_2_3(); void menu_2_4(); void menu_2_5(); void menu_2_6(); void menu_2_7(); void menu_2_8(); void menu_2_9(); void IsUpdate() { if (Update == true) {  Student*p = StuRoot->next;  Subject*q = SubRoot->next;  while (q)  {  float sum = 0;  StuList *t =q->GetStuPtr()->next;  while (t)  {   sum += t->score;   t = t->next;  }  q->SetAveGrade(sum);  q->SetUpdate(false);  q = q->next;  }  while (p)  {  float sum = 0, xuefen = 0, xuefen1 = 0;  SubList *t = p->GetSubPtr()->next;  while (t)  {   Subject*tt = FindSub(t->num);   xuefen += tt->GetCredit();   float f = tt->GetStuScore(p->GetNum());   sum += f;   if (f>= 60)   xuefen1 += tt->GetCredit();   t = t->next;  }  p->SetInfo(xuefen, xuefen1, sum);  p->SetUpdate(false);  p= p->next;  }  Update = false; } }};void Manage::DelStu(Student*p){ SubList *l = p->GetSubPtr()->next; while (l) { FindSub(l->num)->DelStu(p->GetNum()); l = l->next; } Student*t = StuRoot; while (t->next != p) t = t->next; t->next = p->next; delete p; Update = true;}void Manage::DelSub(Subject*p){ StuList *l = p->GetStuPtr()->next; while (l) { FindStu(l->num)->DelSub(p->GetNum()); l = l->next; } Subject*t = SubRoot; while (t->next != p) t = t->next; t->next = p->next; delete p; Update = true;}int Manage::ShowSub()const{ Subject*p = SubRoot->next; int n = 0; while (p) { cout << p->GetNum() << " " << p->GetName() << " 学分：" << p->GetCredit() << endl; n++; p = p->next; } return n;}int Manage::ShowStu()const{ Student*p = StuRoot->next; int n = 0; while (p) { cout << p->GetNum() << " " << p->GetName() << endl; n++; p = p->next; } return n;}Student*Manage::FindStu(int num){ Student*p = StuRoot->next; while (p) { if (p->GetNum() == num)  break; p = p->next; } return p;}Subject*Manage::FindSub(int num){ Subject*p = SubRoot->next; while (p) { if (p->GetNum() == num)  break; p = p->next; } return p;}//总菜单 int Manage::menu(){ int k = 0, n; while (1) { system("cls"); cout << endl << endl; cout << "*******************************************/n"  << "*                     */n"  << "*       学生选修课系统       */n"  << "*                     */n"  << "*   操作方式:              */n"  << "*        1.选修课系统学生端    */n"  << "*                     */n"  << "*        2.选修课系统管理端    */n"  << "*        0. 退出          */n"  << "*******************************************/n"  << endl; cout << "/n/t/t请选择登入方式: "; cin >> n; if (n > -1 && n < 3)  return n; else {  cerr << "/n/n/t/t/t/t输入有误!/n" << endl;  k++; } if (k == 3) {  cerr << "/n/n/n/t/t~~提示~~:错误输入次数超过三次，你将被强制退出!!/n/n" << endl;  return 0; } system("pause"); }}//选修课系统端操作 int Manage::custom(){ int n, k = 0; while (1) { system("cls");; cout << "/n/n/n" << "※※※※※※※※※※※※※※※※※※※※※※※※※※/n"  << "※        选修课系统学生端        ※/n"  << "※                        ※/n"  << "※          操作方式:.         ※/n"  << "※          1、 学生选课         ※/n"  << "※          2、 学生情况         ※/n"  << "※          3、 选课情况         ※/n"  << "※          4、 退出系统         ※/n"  << "※                        ※/n"  << "※※※※※※※※※※※※※※※※※※※※※※※※※※/n" << endl; cout << "/t/t/t请选择操作方式: "; cin >> n; if (n > 0 && n < 5)  return n; else {  cerr << "/n/t/t/t/t输入有误!请重新输入/n" << endl;  k++; } if (k == 3) {  system("cls");  cerr << "错误输入超过三次!你将被强制退出!!/n" << endl;  return 4; } system("pause"); }}int Manage::server(){ int n, k = 0; while (1) { system("cls");; cout << "/n/n/n" << "※※※※※※※※※※※※※※※※※※※※※※※※※/n"  << "※                       ※/n"  << "※         选修课系统管理端       ※/n"  << "※                       ※/n"  << "※  操作方式:                 ※/n"  << "※      1.增加学生   2.增加课程     ※/n"  << "※      3.删除学生   4.删除课程     ※/n"  << "※      5.填写成绩   6.更改学分     ※/n"  << "※      7.学生情况   8.选课情况     ※/n"  << "※      9.保存数据   0.退出系统     ※/n"  << "※                       ※/n"  << "※※※※※※※※※※※※※※※※※※※※※※※※※/n" << endl; cout << "/t/t 请选择操作方式: " << endl; cin >> n; if (n > -1 && n < 10)  return n; else {  cerr << "/n/t/t/t/t输入有误!/n" << endl;  k++; } if (k == 3) {  cerr << "错误输入超过三次!/n";  return 0; } system("pause"); }}Student* Manage::password1(){ system("cls"); int k = 0; int num; while (1) { cout << "请输入你的学号：" << endl; cin >> num; Student*p = FindStu(num); if (p == NULL) {  cout << "无此学号！!请重新输入 " << endl;  k++;   system("pause"); } else {  cout << "你的名字为：" << p->GetName() << endl;  cout << "请按任意键进入选课系统" << endl;  return p; } if (k >= 3) {  system("cls");  cerr << "/n/n/t/t/t输入错误密码超过三次!请按任意键退出.." << endl;  return NULL; }  }}//密码检查 bool Manage::password2(){ int k = 0, i; const char A[] = "admin"; char B[10]; system("cls"); for (i = 0; i < 8; i++) cout << endl; while (1) { printf("/t/t/t请输入管理员密码:"); i = 0; cin >> B; if (strcmp(A, B) == 0)  return true; else {  k++;  cerr << "/n/n/t/t/t密码输入错误!请重新输入!/n" << endl;  system("pause"); } if (k ==3) {  system("cls");  cerr << "/n/n/t/t/t输入错误密码超过三次!请按任意键退出.." << endl;  return false; } }}void Manage::Start(){ int n = 1; while (n) { n = menu(); if (n == 1) {  Student*p = password1();  while (p)  {  int c = custom();  switch (c)  {  case 1: menu_1_1(p); break;//学生选课    case 2:p->ShowStuInfo(); break;//学生情况   case 3:ShowStuSubInfo(p);; break;//选课情况   }  IsUpdate();  if (c == 4) break;//退出系统   }  if (p == NULL)  n = 0; } else if (n == 2) {  bool t = password2();  while (t)  {  int c = server();  switch (c)  {  case 1:menu_2_1();  break;  //增加学生   case 2:menu_2_2(); break;  //增加课程   case 3: menu_2_3(); break;  //删除学生    case 4:menu_2_4();  break;  //删除课程    case 5: menu_2_5(); break;  //填写成绩   case 6: menu_2_6(); break;  //更改学分   case 7:menu_2_7();  break;  //学生情况   case 8:menu_2_8();  break;  //选课情况   case 9: menu_2_9(); break;  //保存数据   }  IsUpdate();  if (c == 0)   break;  //退出系统   }  if (!t)  n = 0; } }}//学生端功能函数 void Manage::menu_1_1(Student*p)  //学生选课{ if (p->IsFull()) cout << "你的课程已经选满了" << endl; else { int num; if (ShowSub()==0)  cout << "无课程可以选择" << endl; else {  cout << "请输入你的选择" << endl;  cin >> num;  if (p->FindSub(num))  cout << "此课程你已经选择" << endl;  else if (FindSub(num)->IsFull())  cout << "课程人数已满" << endl;  else  {  p->AddSub(num);  FindSub(num)->AddStu(p->GetNum());  cout << "选课成功" << endl;  } } } Update = true; system("pause");}void Manage::ShowStuSubInfo(Student*p){ SubList*l = p->GetSubPtr()->next; cout << p->GetNum() << " " << p->GetName() << " 选课数" << p->GetFactSubNum() << endl; while (l) { Subject*s = FindSub(l->num); cout << "/t/t" << s->GetNum() << " " << s->GetName() << " " << s->GetCredit() << endl; float f = s->GetStuScore(p->GetNum()); cout << "/t/t 成绩 " << f << endl; cout << "------------------------------" << endl; l = l->next; }}//管理端功能函数void Manage::menu_2_1()  //增加学生 { system("cls"); int num; char name[20]; cout << "/n/n/t/t/t/t增加学生操作/n" << endl; cout << "/n/n/t/t请输入学生学号:"; cin >> num; if (FindStu(num)) cout << "学生已经存在" << endl; else { cout << "/n/n/t/t请输入学生姓名:"; cin >> name; Student*p = new Student(); p->SetNum(num); p->SetName(name); Student *root = StuRoot; while (root->next)  root = root->next; root->next = p; cout << endl << "/t/t增加学生操作成功,按任意键继续" << endl; } system("pause");}void Manage::menu_2_2()  //增加课程 { system("cls"); int num; float credit; char name[20]; cout << "/n/n/t/t/t/t增加课程操作/n" << endl; cout << "/n/n/t/t 请输入课程代号:"; cin >> num; if (FindSub(num)) cout << "/n/t/t此课程已经存在,按任意键继续" << endl; else { cout << "/n/n/t/t请输入课程名:"; cin >> name; cout << "请输入课程学分" << endl; cin >> credit; Subject*p = new Subject(); p->SetNum(num); p->SetName(name); p->SetCredit(credit); Subject *root = SubRoot; while (root->next)  root = root->next; root->next = p; cout << endl << "/t/t增加课程操作成功,按任意键继续" << endl; } system("pause");}void Manage::menu_2_3() //删除学生 { system("cls"); cout << "/n/n/t/t/t/t删除学生操作" << endl; if (ShowStu()==0) cout << "无学生" << endl; else { int num; cout << "/n/t请输入要删除的学生代学号:"; cin >> num; Student*p = FindStu(num); if (p == NULL)  cout << "无此学生" << endl; else {  DelStu(p);  cout << "/n/t/t删除学生操作成功,按任意键继续.." << endl; } } system("pause");}void Manage::menu_2_4()  //删除课程 { system("cls"); cout << "/n/n/t/t/t/t删除课程操作" << endl; if (ShowSub()==0) cout << "无课程" << endl; else { int num; cout << "/n/t请输入要删除的课程代号:"; cin >> num; Subject*p = FindSub(num); if (p == NULL)  cout << "无此课程" << endl; else {  DelSub(p);  cout << "/n/t/t删除课程操作成功,按任意键继续.." << endl; } } system("pause");}void Manage::menu_2_5()  //填写成绩 { system("cls"); cout << "/n/n/t/t/t/t 填写成绩操作/n" << endl; if (ShowSub()==0) cout << "/n/n/n/t/t对不起,暂时没有任何选修课程。请按任意键继续.." << endl; else { int num; cout << "请选择课程代号" << endl; cin >> num; Subject*p = FindSub(num); if (p == NULL)  cerr << "/n/t/t没有此课程!!请按任意键继续.." << endl; else {  cout << p->GetNum() << " 课程名称" << p->GetName() << " 选课人数" << p->GetFactStuNum() << endl;  int n;  cout << "请输入1确认开始填写成绩,按其他键退出" << endl;  cin >> n;  if (n == 1)  {  StuList*q = p->GetStuPtr()->next;  while (q)  {   Student*l = FindStu(q->num);   cout << "/n/n/t/t请填写" << q->num << " " << l->GetName() << "的学生成绩/n" << endl;   cin >> q->score;   l->SetUpdate(true);   q = q->next;  }  p->SetUpdate(true);  } } } Update = true; system("pause");}void Manage::menu_2_6()  //更改学分 { system("cls"); cout << "/n/n/n/t/t/t/t更改学分操作/n" << endl; if (ShowSub()==0) cout << "/n/n/n/t/t对不起,暂时没有任何课程。请按任意键继续.." << endl; else { int num; cout << "请选择课程代号" << endl; cin >> num; Subject*p = FindSub(num); if (p == NULL)  cout << "无此课程" << endl; else {  float n;  cout << "/n/t/t/t原来学分为:" << p->GetCredit() << endl;  cout << "/n/t/t/t现要更改为:";  cin >> n;  p->SetCredit(n);  StuList*q = p->GetStuPtr()->next;  while (q)  {  FindStu(q->num)->SetUpdate(true);  q = q->next;  }  cout << "/n/t/t更改课程学分成功,按任意键继续" << endl; } } Update = true; system("pause");}void Manage::menu_2_7(){ Student *p = StuRoot->next; if (p == NULL) cout << "无记录" << endl; else while (p) {  ShowStuSubInfo(p);  p = p->next; } system("pause");}void Manage::menu_2_8()  //选课情况{ system("cls"); cout << "/n/n/t/t/t/t选课情况操作" << endl; if (ShowSub()==0) cout << "/n/n/n/t/t对不起,暂时没有课程!!请按任意键继续.." << endl; else { int num; cout << "/n/t请输入要查看的课程代号:"; cin >> num; Subject*p = FindSub(num); if (p == NULL)  cout << "/n/t/t无此课程!!/t请按任意键继续.." << endl; else {  cout << p->GetNum() << " " << p->GetName() << " " << p->GetCredit() << endl;  cout << "/t/t最大人数:" << p->GetMaxStuNum() << " " << "实际人数" << p->GetFactStuNum() << endl;  StuList*q = p->GetStuPtr()->next;  while (q)  {  cout <<q->num << " " << FindStu(q->num)->GetName() << " " << q->score << endl;  q = q->next;  } } } system("pause");} /*保存数据 不过没有读取函数 这个功能就没有 读取懒的写了... */void Manage::menu_2_9() { Student*p = StuRoot->next; ofstream o("Student.txt",32); ofstream oo("SubList.txt", 32); while (p) { SubList*t=p->GetSubPtr()->next; o.write(reinterpret_cast<char*>(p), sizeof(*p)); while (t) {  oo.write(reinterpret_cast<char*>(t), sizeof(*t));  t = t->next; } p = p->next; } o.close(); oo.close(); Subject*q = SubRoot->next; o.open("Subject.txt", 32); oo.open("StuList.txt", 32); while (q) { StuList*t = q->GetStuPtr()->next; o.write(reinterpret_cast<char*>(q), sizeof(*q)); while (t) {  oo.write(reinterpret_cast<char*>(t), sizeof(*t));  t = t->next; } q = q->next; } o.close(); oo.close(); cout << "/n/n/n/t/t/t保存数据成功!按任意键继续.." << endl; system("pause");}int main(){ Manage m; m.Start(); return 0;}