#include <iostream>
using namespace std;

/* The Student class */
class Student {
	private:
		string firstname, lastname, VUID;
		int marks;
		Student *nextStudent;
		
	public:
		// constructor of Student class to initialize data members of class   
        Student(){
        	VUID = "";
            marks = 0;
			firstname = "";
            lastname = "";            			
            nextStudent = NULL;
        }        
        
        // Student class method to set VU  ID of Student
        void setVUID(string val){
            VUID = val;
        };
        
        //Student class method to get VU ID of Student
        string getVUID(){
            return VUID;
        }; 
            
        // Student class method to set first name of Student
        void setFirstName(string val){
            firstname = val;
        };
        
        //Student class method to get first name of Student
        string getFirstName(){
            return firstname;
        }; 
        
        // Student class method to set last name of Student
        void setLastName(string val){
            lastname = val;
        };
        
        //Student class method to get last name of Student
        string getLastName(){
            return lastname;
        };
        
        //Student class method to set the Marks of Student
        void setMarks(int val) { 
            marks = val; 
        };
		// Student class method to get the Marks of Student
        int getMarks() { 
            return   marks; 
        }
        
        //Student class method to point current Student to next Student
        void setNext(Student *nextStudent) {
        	this->nextStudent   =   nextStudent; 
        }
        
        // Student class method to get memory address where pointer is pointing
        Student *getNext() { 
            return   nextStudent; 
        }       
};

/* The List class */
class List {
	
	private:
		Student *   head;
        Student *   current;
    
    public:
        // constructor of list class to initialize data members of class
        List() {            
            head   =   new Student();
            head->setNext(NULL);
            current   =   NULL;          
        }                
        
        // list class method to add Students into list
        void   add() {
            Student *newStudent = new Student();
            int loc_marks = 0;
            string loc_vuid = "", loc_fname = "", loc_lname = "";
            
            cout<<"\nEnter VU ID: ";
            cin>>loc_vuid;
            newStudent->setVUID(loc_vuid);
            
            cout<<"Enter Marks: ";
            cin>>loc_marks;
            newStudent->setMarks(loc_marks); 
            
            cout<<"Enter First Name: ";
            cin>>loc_fname;
            newStudent->setFirstName(loc_fname);
            
            cout<<"Enter Last Name: ";
            cin>>loc_lname;
            newStudent->setLastName(loc_lname);
           
            if(head->getNext() == NULL){
           		newStudent->setNext(NULL);
               	head->setNext(newStudent);               	
               	current   =   newStudent;
		    }
		    else{
		    	Student *temp = head;
		    	while(temp->getNext() != NULL && temp->getNext()->getMarks() >= loc_marks){
		    		temp = temp->getNext();
				}
				current = temp;
				newStudent->setNext(current->getNext());
               	current->setNext( newStudent );               	
               	current   =   newStudent;
		   }         
        };        

        // list class method to get the information of Student
        void getInfo() { 
            if (current  !=  NULL){
				cout<<"VU ID: "<<current->getVUID()<<endl;
	            cout<<"Marks: "<<current->getMarks()<<endl;				 
				cout<<"First Name: "<<current->getFirstName()<<endl;
				cout<<"Last Name: "<<current->getLastName()<<endl<<endl;				
			}
        };				          
               
        // list class method to move current to next Student
        bool next() {
            if (current  ==  NULL){
                return  false;
            }  
            current  =  current->getNext();            
        };
        
        // frient function to list class to show all students in the list
        friend void showStudents(List list){
            Student* savedCurrent  =  list.current;
            list.current  =  list.head;
            
            for(int i = 1; list.next(); i++){			
				list.getInfo();          
			}
            list.current  =  savedCurrent;
        };
};
    
main() {
	int input = 0;
    List lst;      
    
    while(input != -1) {
        
        cout<<"1. To Add New Student in Ranking"<<endl;
        cout<<"2. To Display Ranking"<<endl;
        cout<<"3. To Close"<<endl<<endl;
        cout<<"Enter Your Choice: (1, 2 or 3) ";
        cin>> input;
        
        if(input == 1) {
        	lst.add();
			cout<<"Student's information saved successfully.\n"; 
        }
        else if(input == 2) {
        	cout<<"\nRanking Chart"<<endl;
            showStudents(lst);
            return 0;
        }
        else {
        	return 0;
        }		
	}
}

Please carefully read the following instructions before attempting assignment.
RULES FOR MARKING
It should be clear that your assignment would not get any credit if:
• The assignment is submitted after the due date.
• The submitted assignment does not open or file is corrupt.
• Strict action will be taken if submitted solution is copied from any other student or from the internet.

Lectures:

• Lectures 1 to 7 are covered in this assignment
NOTE
No assignment will be accepted after the due date via email in any case (whether it is the case of load shedding or internet malfunctioning etc.). Hence refrain from uploading assignment in the last hour of deadline. It is recommended to upload solution file at least one day before its closing date.
If you people find any mistake or confusion in assignment (Question statement), please consult with your instructor before the deadline. After the deadline no queries will be entertained in this regard.
For any query, feel free to email at: cs301@vu.edu.pk

Problem Statement:
Suppose you are asked to make a Ranking information chart of students in a dynamic list called linked list using C++ language. The data will be stored in this list in order i.e. the highest marks student will be on top position with other information whereas the next highest marks student will be on second top position and so on.
Your program will get the information of a student in the form of input (Student ID, Name, Marks) through console. After filling the required information, the student will be inserted in linked list at right place. The right place of student will be decided on the basis of marks.
Furthermore, you are required to use only classes for this assignment. As we are not covering Struct in this course so using it in assignment solution is not allowed.
Sample Output:
See the gif file attached with this assignment file.

Note:
DO REMEMBER that you must use your VUID as an input in this program.

Submission details
Following Files Must be submitted in a single zip or rar file.
• C++ code file (file name should be your VUID)
• A .gif file which shows only “execution” of your Application (For Recording .gif a software named Screentogif is uploaded on LMS, or you can use any other gif recording tool as well)
• First record must be with your own VU-ID in .gif file.
If you do not submit any of the above-mentioned file or use some other VU-ID, you will be awarded Zero Marks.

“The End”