Create an application to keep track of a list of students and their grades in a data structures course using a linked list. You should use the C++ STL library. You need to create a class called student that contains 2 data members: name and grade and then create a linked list of objects of this class. The application should allow the user to add a student, remove a student, update the grade for a student, and search for a student.The class should have a constructor with two parameters with only the grade as optional. Remember, a user must provide the student's name in order to create an object of that class.Add validation code for the grade to make sure the grade is only A-F or '?' (grade is unknown or course is still in progress). Put all validation code in one function. Avoid redundancy. Overload the equality operator (==) -- use the string class member function compare to compare strings. Two objects of the student class are equal if the students' names are equal.Make sure to test the class.Please separate each file in your answer so it can be understood well.

Code : #include<iostream> #include<list> using namespace std; //Student class with name and grade fields class Student{ string name; double grade; public: //constructor taking values for name and grade Student(string stud_name, double stud_grade){ name=stud_name; grade=stud_grade; } //default constructor Student(){ name=""; grade=0; } //getters and setters string getName() const{ return name; } double getGrade() const { return grade; } void setGrade(double stud_grade){ grade=stud_grade; } void setName(string stud_name){ name=stud_name; } }; //method to ask user to enter details of a student, create a Student object and //add to the list void add_student(list<Student>& sList){ string name; double grade; cout<<"Enter student name (first name only) and numeric score: "; cin>>name>>grade; //creating a Student Student s(name, grade); //adding to list sList.push_back(s); } //method to ask for a student name, remove the student from the list if found void remove_student(list<Student>& sList){ string name; cout<<"Enter name of the student to remove: "; cin>>name; bool found=false; //not found yet //using iterator, looping through the list for(list<Student>::iterator i=sList.begin();i!=sList.end();i++){ Student s=*i; //checking if student's name is same as given name if(s.getName()==name){ //found, removing student and alerting user sList.erase(i); cout<<"removed successfully!"<<endl; found=true; break; //exiting loop } } //displaying a message if not found if(!found){ cout<<"not found!"<<endl; } } //method to ask for a student name and new grade, update the score of the student if exists void update_grade(list<Student>& sList){ string name; double grade; cout<<"Enter name of the student to update the score: "; cin>>name; bool found=false; for(list<Student>::iterator i=sList.begin();i!=sList.end();i++){ Student s=*i; if(s.getName()==name){ //found, asking for grade cout<<"Enter the new grade: "; cin>>grade; //updating grade i->setGrade(grade); found=true; break; } } if(!found){ cout<<"not found!"<<endl; } } //method to ask for a student name and check if a student with that name exists void search_student(list<Student>& sList){ string name; cout<<"Enter name of the student to search: "; cin>>name; bool found=false; for(list<Student>::iterator i=sList.begin();i!=sList.end();i++){ Student s=*i; if(s.getName()==name){ //found cout<<"found! the grade of "<<name<<" is "<<s.getGrade()<<endl; found=true; break; } } if(!found){ //not found cout<<"not found!"<<endl; } } //method to display all students details void display_students(list<Student>& sList){ for(list<Student>::iterator i=sList.begin();i!=sList.end();i++){ Student s=*i; cout<<"Name: "<<s.getName()<<", grade: "<<s.getGrade()<<endl; } cout<<endl; } int main(){ //creating an stl list of Student objects list<Student> sList; string ch=""; //looping until user enter 'x' to quit while(ch!="x"){ //printing menu, reading choice cout<<"a. add a student"<<endl; cout<<"b. remove a student"<<endl; cout<<"c. search for a student"<<endl; cout<<"d. update grade of a student"<<endl; cout<<"e. display all students"<<endl; cout<<"x. exit"<<endl; cin>>ch; cout<<endl; //based on choice, calling the appropriate methods. if(ch=="a"){ add_student(sList); }else if(ch=="b"){ remove_student(sList); }else if(ch=="c"){ search_student(sList); }else if(ch=="d"){ update_grade(sList); }else if(ch=="e"){ display_students(sList); } } return 0; }Output : a. add a student b. remove a student c. search for a student d. update grade of a student e. display all students x. exit a Enter student name (first name only) and numeric score: oliver 90 a. add a student b. remove a student c. search for a student d. update grade of a student e. display all students x. exit a Enter student name (first name only) and numeric score: john 66 a. add a student b. remove a student c. search for a student d. update grade of a student e. display all students x. exit e Name: oliver, grade: 90 Name: john, grade: 66 a. add a student b. remove a student c. search for a student d. update grade of a student e. display all students x. exit a Enter student name (first name only) and numeric score: will 37 a. add a student b. remove a student c. search for a student d. update grade of a student e. display all students x. exit e Name: oliver, grade: 90 Name: john, grade: 66 Name: will, grade: 37 a. add a student b. remove a student c. search for a student d. update grade of a student e. display all students x. exit c Enter name of the student to search: john found! the grade of john is 66 a. add a student b. remove a student c. search for a student d. update grade of a student e. display all students x. exit c Enter name of the student to search: juhi not found! a. add a student b. remove a student c. search for a student d. update grade of a student e. display all students x. exit d Enter name of the student to update the score: will Enter the new grade: 87 a. add a student b. remove a student c. search for a student d. update grade of a student e. display all students x. exit e Name: oliver, grade: 90 Name: john, grade: 66 Name: will, grade: 87 a. add a student b. remove a student c. search for a student d. update grade of a student e. display all students x. exit b Enter name of the student to remove: john removed successfully! a. add a student b. remove a student c. search for a student d. update grade of a student e. display all students x. exit e Name: oliver, grade: 90 Name: will, grade: 87 a. add a student b. remove a student c. search for a student d. update grade of a student e. display all students x. exit b Enter name of the student to remove: uuh not found! a. add a student b. remove a student c. search for a student d. update grade of a student e. display all students x. exit x