/* 
http://pnu.hamidjalali.com
www.8gerd.tk
*/
       


#include<iostream.h>
#include<time.h>
#include<math.h>
#include<iomanip>



class studentrecord
{
public:
	studentrecord();
	char fname[10];
	char lname[10];
	int ID;
	char programme[10];
	int year_of_study;
	studentrecord *nxt;
	void register_student();
	void display_all();
    void displayStudentInformation();
    void Swap();
    void SearchStudent(); 
	void DeleteStudent();
	void ConditionalDisplay();
};
studentrecord::studentrecord()
{
}
studentrecord *start_ptr=NULL;
int khetho=0;

void studentrecord::register_student()
{
	studentrecord *temp,*temp2;
	temp=new studentrecord;
	cout<<"enter the student fist name:"<<endl;
	cin>>temp->fname;
	cout<<"enter student last name:"<<endl;
	cin>>temp->lname;
	cout<<"enter student id:"<<endl;
	cin>>temp->ID;
    cout<<"Enter the Programme of the student:"<<endl;
	cin>>temp->programme;
	cout<<"Enter student's year:"<<endl;
	cin>>temp->year_of_study;
	temp->nxt=NULL;

	
	if(start_ptr==NULL)
	{
		start_ptr=temp;
	}
	else
	{
		temp2=start_ptr;

  while(temp2->nxt!=NULL)
  {
	  temp2=temp2->nxt;
  }
  temp2->nxt=temp;
	}
}
void studentrecord::display_all()
{
	studentrecord *temp;
   temp=start_ptr;
if(start_ptr==NULL)
{
	cout<<"the record is empty"<<endl;
}
else
{

while(temp!=NULL)
{
	cout<<"last name is:"<<temp->lname<<endl;
	cout<<"ID:"<<temp->ID<<endl;
	cout<<"first name is:"<<temp->fname<<endl;
	cout<<"the programme is:"<<temp->programme<<endl;
	cout<<endl;
	cout<<endl;

	temp=temp->nxt;
}
}
}

void studentrecord::Swap()
{   studentrecord *temp,*temp2,*temp3,*temp4; 
       temp= start_ptr;
       cout<<endl;
       int id,id1; //count;
       cout<<"enter ID u want to swap "<<endl;
       cin>>id;
       cout<<"enter 2nd ID u want to swap "<<endl;
	   cin>>id1; 
       if (start_ptr == NULL)
	   {
         cout << "The list is empty!" << endl;
	   }
	   while(temp!=NULL)
	   {
       if(temp->ID=id1)
	   { 
		   temp2=temp;
           temp=temp->nxt;
	   }
	   }

       while(temp3!=NULL)
	   {
        if(temp3->ID=id1)
		{
			temp4=temp3;
           temp3=temp3->nxt;

		}
	   }

     temp->nxt=temp4;
     temp3->nxt=temp2;
	 temp->nxt=temp3->nxt;
	 temp3->nxt=temp->nxt;
     //temp4->nxt=temp2->nxt;
     //temp2->nxt=temp4->nxt;
     //temp3->nxt=temp2;
	//	temp2->nxt=temp->nxt;
	//	delete temp;
       cout<<endl;
//       cout<<count;
	  }

	
void studentrecord:: SearchStudent()
{    studentrecord *temp; 
       temp= start_ptr;
    cout<<endl;
       int id,count=0;
       cout<<"enter student ID u want to search for";
       cin>>id; 
       if (start_ptr == NULL)
         cout << "The list is empty!" << endl;
      else
	  {
         while(temp!=NULL )
		 {
           if(temp->ID==id)
		   {
             cout<<"ID :"<<temp->ID<<endl;
             cout<<"First Name: "<<temp->fname<<endl;
			 cout<<"Last Name: "<<temp->lname<<endl;
			 cout<<"Programme: "<<temp->programme<<endl;
			 cout<<"Year of Study: "<<temp->year_of_study<<endl;
             count++;
		   }
       //temp->display_list();
           
            temp = temp->nxt;
		 }
       cout<<endl;
       cout<<count;
	  }
}


void studentrecord:: DeleteStudent()
{      studentrecord *temp,*temp2; 
       temp= start_ptr;
       cout<<endl;
       int id, count;
       cout<<"enter id u wana delete";
       cin>>id; 
       if (start_ptr == NULL)
	   {
         cout << "The list is empty!" << endl;
	   }
	   if(start_ptr->ID = id)
	   {
		   temp=start_ptr;
		   start_ptr=start_ptr->nxt;
	   delete temp;
	   }
      else
	  {
        while(temp->ID!=id)
		   {
			   temp2=temp;
             cout<<temp->ID;
			 count++;
             temp = temp->nxt;
		}
		temp2->nxt=temp->nxt;
		delete temp;
       cout<<endl;
       cout<<count;
	  }
}

void studentrecord::ConditionalDisplay()
{    studentrecord *temp; 
      temp= start_ptr;
      cout<<endl;
	  int count=0;
       char lastname[20];
       cout<<"Enter the Last Name to search:   ";
       cin>>lastname; 
       if (temp == NULL)
         cout << "The list is empty!" << endl;
      else
	  {
         while(temp!=NULL )
		 {
			 if(temp->lname==lastname)
			 {		  
			 cout<<endl;
			 cout<<temp->lname<<endl;
             cout<<temp->fname<<endl;
             cout<<temp->ID<<endl;
	         cout<<temp->ID<<endl;
             cout<<temp->year_of_study<<endl;
            temp=temp->nxt;
		   }
       //temp->display_list();
           
            temp = temp->nxt;
		 }
       cout<<endl;
       cout<<"There are "<<count<<"maches";
	  }
}

void studentrecord:: displayStudentInformation()
{      studentrecord *temp; 
       temp= start_ptr;
    cout<<endl;
       int id,count=0;
       cout<<"enter id to get student information";
       cin>>id;
       if (temp == NULL)
         cout << "The list is empty!" << endl;
      else
   {
         while(temp!=NULL )
   {
    if(temp->ID==id)
    {
      cout<<temp->fname<<endl;
      cout<<temp->lname<<endl;
      cout<<temp->ID<<endl;
      cout<<temp->year_of_study<<endl;
	  cout<<endl;
	  
      count++; 
    }
       //temp->display_list();
           
      temp = temp->nxt;
   }
   cout<<endl;
  cout<<count;
	  }
}
void main()

{  
    //start_ptr = NULL;
    studentrecord l;

     do
	{
	 
	  cout << "             ______________________________"<<endl;
	  cout << "             Please select a choice : " << endl;
	  cout << "             ______________________________"<<endl;
	  cout << "             0. Exit the program." << endl;
	  cout << "             1. register student." << endl;
	  cout << "             2. search student." << endl;
	  cout << "             3. Swap student postion." << endl;
	  cout << "             4. display student information." << endl;
      cout << "             5. display all." << endl;
	  cout << "             6. conditional display."<<endl;
	  cout << "             7. delete."<<endl;
      cout << "             _______________________________" <<endl << "";
	 cin >> khetho;

	  switch (khetho)
	  {   
	      case 1 : l.register_student();
	cout<<" ";system("pause");
    		  system("cls");

			  break;
	      case 2 : l.SearchStudent(); break;
	      case 3 : l.Swap(); break;
	      case 4 : l.displayStudentInformation(); break;
          case 5 : l.display_all();break;
		  case 6 : l.ConditionalDisplay();break;
          case 7 : l.DeleteStudent();break;
	    }
	}
     while (khetho != 0);
  }