选课系统原型（文件流）

原型中的account固定为路径格式。

#include
#include
#include
using namespace std;
char judge;
char account[100], password_input[10], password_real[10];
int num;
char lessons[10][10] = { {"Lessons" }, { "C++" }, { "Math" },{ "English" }, { "Physics" } };
void limit_0_1()
{
 while (judge != '1' && judge != '0')
 {
  cout << "Warning! You can only choose 1 or 0 rather than any other words." << endl;
  cin >> judge;
  getchar();
 }
}
void limit_1_4()
{
 while (judge != '1'&&judge != '2'&&judge != '3'&&judge != '4')
 {
  cout << "Warning! You can only choose 1, 2, 3 and 4 rather than any other words." << endl;
  cin >> judge;
  getchar();
 }
}
void Hello()
{
 cout << "Hello, welcome to the course selection system of Umbrella Corporation." << endl;
 cout << "Now, you can log in or sign in. 1/0?" << endl;
 cin >> judge;
 getchar();
 limit_0_1();
}
void sign_in(char ch)
{
 cout << "Please input your account." << endl;
 cin.getline(account, 101);
 ofstream out(account, ios::out);
 if (ch == '1')
  out << "1" << endl;
 else if (ch == '0')
  out << "0" << endl;
 cout << "Please input your password." << endl;
 cin.getline(password_real, 101);
 out << password_real << endl;
 out.close();
 cout << "Congratulations! You have succeeded in signing in." << endl;
}
void adding_lesson(int a)
{
 if (a == 1)
 {
  cout << "Please input the student's account who you want to manage." << endl;
  cin.getline(account, 101);
 }
 ofstream out(account, ios::app);
 cout << "Please tell me which lesson you want to choose. 1 is C++, 2 is Math, 3 is English and 4 is Physics." << endl;
 cin >> judge;
 getchar();
 limit_1_4();
 out << lessons[judge - '0'] << "\n";
 out.close();
 cout << "Congratulations! You have succeeded in adding the lesson." << endl;
}
void deleting_lesson(int a)
{
 if (a == 0)
 {
  cout << "Please tell me which lesson you want to delete. 1 is C++, 2 is Math, 3 is English and 4 is Physics." << endl;
  cin >> judge;
  getchar();
  limit_1_4();
 }
 else if (a == 1)
 {
  cout << "Please input the count of the student who you want to manage." << endl;
  cin.getline(account, 101);
  cout << "Please tell me which lesson you want to delete. 1 is C++, 2 is Math, 3 is English and 4 is Physics." << endl;
  cin >> judge;
  getchar();
  limit_1_4();
 }
 ifstream in(account, ios::in);
 char array[10][10], ch, p[10];
 int counter = 0;
 in >> ch >> p;
 while (in >> array[counter])
  counter++;
 in.close();
 bool temp = false;
 if (!counter)
 {
  if(a == 1)
   cout << "Warning! This student haven't chosen any lessons." << endl;
  else if(a == 0)
   cout << "Warning! You haven't chosen any lessons." << endl;
  return;
 }
 else
 {
  ofstream out(account, ios::out);
  out << ch << endl << p << endl;
  for (int i = 0; i < counter; i++)
  {
   if (strcmp(lessons[judge - '0'], array[i]) != 0)
    out << array[i] << endl;
   else
    temp = true;
  }
  out.close();
 }
 if (temp)
  cout << "Congratulations! You have succeeded in deleting the lesson." << endl;
 else
  cout << "Warning! The lesson dosn't exist." << endl;
}
void showing_lessons(int a)
{
 if (a == 1)
 {
  cout << "Please input the count of the student who you want to manage." << endl;
  cin.getline(account, 101);
 }
 ifstream in(account, ios::in);
 char showlessons[10][10], ch, __[10];
 int counter = 0;
 in >> ch >> __;
 while (in >> showlessons[counter])
  counter++;
 in.close();
 if (!counter)
 {
  if (a == 1)
   cout << "Warning! This student hasn't chosen any lessons." << endl;
  else if (a == 0)
   cout << "Warning! You haven't chosen any lessons." << endl;
 }
 else
 {
  if (a == 1)
   cout << "The lessons this student have chosen are ";
  else if(a == 0)
   cout << "The lessons you have chosen are ";
  for (int i = 0; i < counter; i++)
  {
   cout << showlessons[i];
   if (i != counter - 1)
    cout << ", ";
   else
    cout << "." << endl;
  }
 }
}
int main()
{
 while (1)
 {
  Hello();
  if (judge == '1')//登陆账号
  {
   cout << "Please tell me your identity. 1 is teacher and 0 is student." << endl;
   cin >> judge;
   getchar();
   limit_0_1();
   if (judge == '1')//教师登陆
   {
    cout << "Please input your account." << endl;
    cin.getline(account, 101);
    cout << "Please input your password." << endl;
    cin.getline(password_input, 101);
    ifstream in(account, ios::in);
    char ch;
    in >> ch >> password_real;
    if (ch != '1')
    {
     cout << "Warning! You have loged in illegally! The programming has been automatically end!" << endl;
     return 0;
    }
    while (strcmp(password_input, password_real) != 0)
    {
     cout << "Your password is incorrect, you can input it again or quit. 1/0?" << endl;
     cin >> judge;
     getchar();
     limit_0_1();
     if (judge == '1')
     {
      cout << "Please input your password." << endl;
      cin.getline(password_input, 101);
     }
     else if (judge == '0')
      break;
    }
    if (strcmp(password_input, password_real) == 0);
    {
     while (1)
     {
      cout << "Welcome back! Please tell me what do you want to do? 1 is adding lesson, 2 is deleting lesson, 3 is showing lessons and 4 is quiting." << endl;
      cin >> judge;
      getchar();
      limit_1_4();
      if (judge == '1')
       adding_lesson(1);
      else if (judge == '2')
       deleting_lesson(1);
      else if (judge == '3')
       showing_lessons(1);
      else if (judge == '4')
       break;
     }
    }
   }
   else//学生登陆
   {
    cout << "Please input your account." << endl;
    cin.getline(account, 101);
    cout << "Please input your password." << endl;
    cin.getline(password_input, 101);
    ifstream in(account, ios::in);
    char ch;
    in >> ch >> password_real;
    if (ch != '0')
    {
     cout << "Warning! You have loged in illegally! The programming has been automatically end!" << endl;
     return 0;
    }
    while (strcmp(password_input, password_real) != 0)
    {
     cout << "Your password is incorrect, you can input it again or quit. 1/0?" << endl;
     cin >> judge;
     getchar();
     limit_0_1();
     if (judge == '1')
      cin.getline(password_input, 101);
     else if (judge == '0')
      break;
    }
    if (strcmp(password_input, password_real) == 0);
    {
     while (1)
     {
      cout << "Welcome back! Please tell me what do you want to do? 1 is adding lesson, 2 is deleting lesson, 3 is showing lessons and 4 is quiting." << endl;
      cin >> judge;
      getchar();
      limit_1_4();
      if (judge == '1')
       adding_lesson(0);
      else if (judge == '2')
       deleting_lesson(0);
      else if (judge == '3')
       showing_lessons(0);
      else if (judge == '4')
       break;
     }
    }
   }
  }
  else//注册账号
  {
   cout << "Please tell me you identity. 1 is teacher and 0 is student" << endl;
   cin >> judge;
   getchar();
   limit_0_1();
   if (judge == '1')//教师注册
    sign_in(judge);
   else//学生注册
    sign_in(judge);
  }
  cout << "Please tell me what do you want to do? 1 is continuing and 0 is quiting." << endl;
  cin >> judge;
  getchar();
  limit_0_1();
  if (judge == '0')
  {
   cout << "Thanks for your usage.";
   break;
  }
 }
 return 0;
}