#include <iostream>#include <iomanip> #include <fstream>#include<Windows.h>#include<cstring>using namespace std;struct SubList/*某個學生所學的課程中的某一個 */{ int num; /*課程代號 */ SubList *next;  /*指向下一個課程的指針*/ SubList() :num(-1), next(NULL){} /*構造函數*/};struct StuList /*課程中所選的學生*/{ int num;   /* 學生的學號*/ float score;   /*學生所得的該課程分數*/ StuList *next; /*下一個學生*/ StuList() :num(-1), score(0), next(NULL){}};class Student {private: int Num;  /*學號*/ char Name[20];    /*學生的姓名 */ int MaxSubNum;   /*學生最多可以學五門課程 */ int FactSubNum;   /* 學生實際所學的課程數目 */ SubList *Root;   /*課程的指針*/ float SumXueFen; /*總的選課學分*/ float FactXueFen; /*實際獲得學分*/ float SumGrade; /*總成績*/ bool Update; /*是否需要更新信息*/public: Student *next;/*讓所有學生的信息連接起來*/ SubList *GetSubPtr()const{ return Root; }/*獲取所選的課程表*/ 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); } /* 設置學生的姓名 */ void SetNum(int num){ Num = num; } /*設置學號*/ const char* GetName()const{ return Name; }/*得到學生的姓名 */ int GetNum()const{ return Num; } /*得到學號*/ int GetFactSubNum()const{ return FactSubNum; } /*得到實際選課數*/ bool FindSub(int num)const;  /*查找是否已有此課程,如果有返回,如果沒有返回 */ void SetInfo(float sumXueFen, float factXueFen, float sumGrade) { SumXueFen = sumXueFen;/*這三條信息因為一起用 所以一起設置了*/ FactXueFen = factXueFen; SumGrade = sumGrade; } void SetUpdate(bool t){ Update = t; }/*是否更新信息的標志*/ float GetAveGrade(){ return SumGrade / FactSubNum; }  /*學生課程的平均成績*/ void AddSub(int num); /*增加課程*/ bool IsFull()const{ return MaxSubNum == FactSubNum; } void ShowStuInfo(); /*輸出學生信息*/ void DelSub(int num); /*刪除課程 Manage類使用*/ ~Student()/*析構函數 不要也行影響不太大 一般程序，還不太會內存用完*/ { SubList *p = Root; while (p) {  SubList*t = p->next;  delete p;  p = t; } }};//課程類 class Subject{private: int MaxStuNum;  /*最多學生數*/ int FactStuNum;  /*實際學生數*/ float Credit;  /*該課程的學分 */ char Name[20]; /* 該課程的名稱 */ int Num; /*課程的代號*/ StuList *Root; /* 學生名單 */ float AveGrade; /*該課程的平均成績 */ bool Update; /*是否更新信息*/public: StuList *GetStuPtr()const{ return Root; }/*獲取選此課程的學生表*/ Subject*next; Subject() :Root(new StuList()), MaxStuNum(30), FactStuNum(0), Update(false),next(NULL){} float GetCredit()const{ return Credit; }  //得到課程的學分  void SetCredit(float credit){ Credit = credit; } //設置學分 const char* GetName()const{ return Name; } //讀出課程的名稱 void SetName(char N[]){ strcpy(Name, N); } //設置課程的名稱 int GetNum()const{ return Num; } //讀出課程的代號 void SetNum(int num){ Num = num; } //設置課程的代號 int GetFactStuNum()const{ return FactStuNum; } //返回實際學生數  int GetMaxStuNum()const{ return MaxStuNum; }//最大學生數 void SetUpdate(bool t){ Update = t; } void SetAveGrade(float num){ AveGrade = num/FactStuNum; } //設置平均分 float GetAveGrade(){ return AveGrade; }  //得到學生的平均成績 float GetStuScore(int num); //查找某個學生的成績 bool IsFull()const{ return MaxStuNum == FactStuNum; }//是否人數已滿 void DelStu(int num);//刪除學生 void AddStu(int num);//增加學生 ~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 << " " << "選課數：" << FactSubNum << endl; cout << "/t/t 總成績" << SumGrade << " 平均分" << GetAveGrade() << endl; cout << "/t/t課程總學分" << SumXueFen << " 獲得學分" << FactXueFen << endl;  system("pause");}bool Student::FindSub(int num)const//查找是否已有此課程,如果有返回,如果沒有返回{ 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)//給學生增加一門課 { 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;//顯示可選課程 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() << " 學分：" << 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;}//總菜單 int Manage::menu(){ int k = 0, n; while (1) { system("cls"); cout << endl << endl; cout << "*******************************************/n"  << "*                     */n"  << "*       學生選修課系統       */n"  << "*                     */n"  << "*   操作方式:              */n"  << "*        1.選修課系統學生端    */n"  << "*                     */n"  << "*        2.選修課系統管理端    */n"  << "*        0. 退出          */n"  << "*******************************************/n"  << endl; cout << "/n/t/t請選擇登入方式: "; cin >> n; if (n > -1 && n < 3)  return n; else {  cerr << "/n/n/t/t/t/t輸入有誤!/n" << endl;  k++; } if (k == 3) {  cerr << "/n/n/n/t/t~~提示~~:錯誤輸入次數超過三次，你將被強制退出!!/n/n" << endl;  return 0; } system("pause"); }}//選修課系統端操作 int Manage::custom(){ int n, k = 0; while (1) { system("cls");; cout << "/n/n/n" << "※※※※※※※※※※※※※※※※※※※※※※※※※※/n"  << "※        選修課系統學生端        ※/n"  << "※                        ※/n"  << "※          操作方式:.         ※/n"  << "※          1、 學生選課         ※/n"  << "※          2、 學生情況         ※/n"  << "※          3、 選課情況         ※/n"  << "※          4、 退出系統         ※/n"  << "※                        ※/n"  << "※※※※※※※※※※※※※※※※※※※※※※※※※※/n" << endl; cout << "/t/t/t請選擇操作方式: "; cin >> n; if (n > 0 && n < 5)  return n; else {  cerr << "/n/t/t/t/t輸入有誤!請重新輸入/n" << endl;  k++; } if (k == 3) {  system("cls");  cerr << "錯誤輸入超過三次!你將被強制退出!!/n" << endl;  return 4; } system("pause"); }}int Manage::server(){ int n, k = 0; while (1) { system("cls");; cout << "/n/n/n" << "※※※※※※※※※※※※※※※※※※※※※※※※※/n"  << "※                       ※/n"  << "※         選修課系統管理端       ※/n"  << "※                       ※/n"  << "※  操作方式:                 ※/n"  << "※      1.增加學生   2.增加課程     ※/n"  << "※      3.刪除學生   4.刪除課程     ※/n"  << "※      5.填寫成績   6.更改學分     ※/n"  << "※      7.學生情況   8.選課情況     ※/n"  << "※      9.保存數據   0.退出系統     ※/n"  << "※                       ※/n"  << "※※※※※※※※※※※※※※※※※※※※※※※※※/n" << endl; cout << "/t/t 請選擇操作方式: " << endl; cin >> n; if (n > -1 && n < 10)  return n; else {  cerr << "/n/t/t/t/t輸入有誤!/n" << endl;  k++; } if (k == 3) {  cerr << "錯誤輸入超過三次!/n";  return 0; } system("pause"); }}Student* Manage::password1(){ system("cls"); int k = 0; int num; while (1) { cout << "請輸入你的學號：" << endl; cin >> num; Student*p = FindStu(num); if (p == NULL) {  cout << "無此學號！!請重新輸入 " << endl;  k++;   system("pause"); } else {  cout << "你的名字為：" << p->GetName() << endl;  cout << "請按任意鍵進入選課系統" << endl;  return p; } if (k >= 3) {  system("cls");  cerr << "/n/n/t/t/t輸入錯誤密碼超過三次!請按任意鍵退出.." << endl;  return NULL; }  }}//密碼檢查 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請輸入管理員密碼:"); i = 0; cin >> B; if (strcmp(A, B) == 0)  return true; else {  k++;  cerr << "/n/n/t/t/t密碼輸入錯誤!請重新輸入!/n" << endl;  system("pause"); } if (k ==3) {  system("cls");  cerr << "/n/n/t/t/t輸入錯誤密碼超過三次!請按任意鍵退出.." << 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;//學生選課    case 2:p->ShowStuInfo(); break;//學生情況   case 3:ShowStuSubInfo(p);; break;//選課情況   }  IsUpdate();  if (c == 4) break;//退出系統   }  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;  //增加學生   case 2:menu_2_2(); break;  //增加課程   case 3: menu_2_3(); break;  //刪除學生    case 4:menu_2_4();  break;  //刪除課程    case 5: menu_2_5(); break;  //填寫成績   case 6: menu_2_6(); break;  //更改學分   case 7:menu_2_7();  break;  //學生情況   case 8:menu_2_8();  break;  //選課情況   case 9: menu_2_9(); break;  //保存數據   }  IsUpdate();  if (c == 0)   break;  //退出系統   }  if (!t)  n = 0; } }}//學生端功能函數 void Manage::menu_1_1(Student*p)  //學生選課{ if (p->IsFull()) cout << "你的課程已經選滿了" << endl; else { int num; if (ShowSub()==0)  cout << "無課程可以選擇" << endl; else {  cout << "請輸入你的選擇" << endl;  cin >> num;  if (p->FindSub(num))  cout << "此課程你已經選擇" << endl;  else if (FindSub(num)->IsFull())  cout << "課程人數已滿" << endl;  else  {  p->AddSub(num);  FindSub(num)->AddStu(p->GetNum());  cout << "選課成功" << endl;  } } } Update = true; system("pause");}void Manage::ShowStuSubInfo(Student*p){ SubList*l = p->GetSubPtr()->next; cout << p->GetNum() << " " << p->GetName() << " 選課數" << 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 成績 " << f << endl; cout << "------------------------------" << endl; l = l->next; }}//管理端功能函數void Manage::menu_2_1()  //增加學生 { system("cls"); int num; char name[20]; cout << "/n/n/t/t/t/t增加學生操作/n" << endl; cout << "/n/n/t/t請輸入學生學號:"; cin >> num; if (FindStu(num)) cout << "學生已經存在" << endl; else { cout << "/n/n/t/t請輸入學生姓名:"; 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增加學生操作成功,按任意鍵繼續" << endl; } system("pause");}void Manage::menu_2_2()  //增加課程 { system("cls"); int num; float credit; char name[20]; cout << "/n/n/t/t/t/t增加課程操作/n" << endl; cout << "/n/n/t/t 請輸入課程代號:"; cin >> num; if (FindSub(num)) cout << "/n/t/t此課程已經存在,按任意鍵繼續" << endl; else { cout << "/n/n/t/t請輸入課程名:"; cin >> name; cout << "請輸入課程學分" << 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增加課程操作成功,按任意鍵繼續" << endl; } system("pause");}void Manage::menu_2_3() //刪除學生 { system("cls"); cout << "/n/n/t/t/t/t刪除學生操作" << endl; if (ShowStu()==0) cout << "無學生" << endl; else { int num; cout << "/n/t請輸入要刪除的學生代學號:"; cin >> num; Student*p = FindStu(num); if (p == NULL)  cout << "無此學生" << endl; else {  DelStu(p);  cout << "/n/t/t刪除學生操作成功,按任意鍵繼續.." << endl; } } system("pause");}void Manage::menu_2_4()  //刪除課程 { system("cls"); cout << "/n/n/t/t/t/t刪除課程操作" << endl; if (ShowSub()==0) cout << "無課程" << endl; else { int num; cout << "/n/t請輸入要刪除的課程代號:"; cin >> num; Subject*p = FindSub(num); if (p == NULL)  cout << "無此課程" << endl; else {  DelSub(p);  cout << "/n/t/t刪除課程操作成功,按任意鍵繼續.." << endl; } } system("pause");}void Manage::menu_2_5()  //填寫成績 { system("cls"); cout << "/n/n/t/t/t/t 填寫成績操作/n" << endl; if (ShowSub()==0) cout << "/n/n/n/t/t對不起,暫時沒有任何選修課程。請按任意鍵繼續.." << endl; else { int num; cout << "請選擇課程代號" << endl; cin >> num; Subject*p = FindSub(num); if (p == NULL)  cerr << "/n/t/t沒有此課程!!請按任意鍵繼續.." << endl; else {  cout << p->GetNum() << " 課程名稱" << p->GetName() << " 選課人數" << p->GetFactStuNum() << endl;  int n;  cout << "請輸入1確認開始填寫成績,按其他鍵退出" << endl;  cin >> n;  if (n == 1)  {  StuList*q = p->GetStuPtr()->next;  while (q)  {   Student*l = FindStu(q->num);   cout << "/n/n/t/t請填寫" << q->num << " " << l->GetName() << "的學生成績/n" << endl;   cin >> q->score;   l->SetUpdate(true);   q = q->next;  }  p->SetUpdate(true);  } } } Update = true; system("pause");}void Manage::menu_2_6()  //更改學分 { system("cls"); cout << "/n/n/n/t/t/t/t更改學分操作/n" << endl; if (ShowSub()==0) cout << "/n/n/n/t/t對不起,暫時沒有任何課程。請按任意鍵繼續.." << endl; else { int num; cout << "請選擇課程代號" << endl; cin >> num; Subject*p = FindSub(num); if (p == NULL)  cout << "無此課程" << endl; else {  float n;  cout << "/n/t/t/t原來學分為:" << p->GetCredit() << endl;  cout << "/n/t/t/t現要更改為:";  cin >> n;  p->SetCredit(n);  StuList*q = p->GetStuPtr()->next;  while (q)  {  FindStu(q->num)->SetUpdate(true);  q = q->next;  }  cout << "/n/t/t更改課程學分成功,按任意鍵繼續" << endl; } } Update = true; system("pause");}void Manage::menu_2_7(){ Student *p = StuRoot->next; if (p == NULL) cout << "無記錄" << endl; else while (p) {  ShowStuSubInfo(p);  p = p->next; } system("pause");}void Manage::menu_2_8()  //選課情況{ system("cls"); cout << "/n/n/t/t/t/t選課情況操作" << endl; if (ShowSub()==0) cout << "/n/n/n/t/t對不起,暫時沒有課程!!請按任意鍵繼續.." << endl; else { int num; cout << "/n/t請輸入要查看的課程代號:"; cin >> num; Subject*p = FindSub(num); if (p == NULL)  cout << "/n/t/t無此課程!!/t請按任意鍵繼續.." << endl; else {  cout << p->GetNum() << " " << p->GetName() << " " << p->GetCredit() << endl;  cout << "/t/t最大人數:" << p->GetMaxStuNum() << " " << "實際人數" << 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");} /*保存數據 不過沒有讀取函數 這個功能就沒有 讀取懶的寫了... */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保存數據成功!按任意鍵繼續.." << endl; system("pause");}int main(){ Manage m; m.Start(); return 0;}