Coding in C++

Working on a project that deals with getting students informations and grades and putting them into a registrar, I need help with the design on the project. Here are what I need to do with designing.

Come up with a design to solve the problem. Your design should include:

What are the member variables for the classes (Student and Registrar) and their types

A drawing of the relation between the objects of the two classes

Basically just name some variables that will go in each file and tell me how they relate between eachother classes. Dont have to write a full working code just an outline

Here are the files that I need to make members in

Student.h

class Student {

public:

Student(); // default constructor

Student(const string &cwid); // constructor with parameter

void addCourseGrade(const string &courseName, char grade); // add course name and grade to student's record

double getGPA(); // calculate and return GPA

void printTranscript(); // print transcript - see Student.cpp for the format

string getCWID(); // return the CWID of this student

private:

// any private member variables and methods go here

// TO BE COMPLETED

Student.cpp

Student::Student() {

// TO BE COMPLETED

}

Student::Student(const string &cwid) {

// TO BE COMPLETED

}

string Student::getCWID() {

// TO BE COMPLETED

}

void Student::addCourseGrade (const string &courseName, char grade) {

// TO BE COMPLETED

}

double Student::getGPA() {

// TO BE COMPLETED

}

// print transcript in this (sample) format:

// TRANSCRIPT FOR CWID=279750343

// CS 121 C

// CS 253 B

// CS 131 B

// GPA = 2.6667

void Student::printTranscript() {

// TO BE COMPLETED

}

Registrar.h

class Registrar {

public:

void readTextfile(string filename); // Load information from a text file with the given filename: THIS IS COMPLETE

void addLine(string courseName, string cwid, char grade); // process a line from the text file

Student& getStudent(string cwid) const; // return the Student object corresponding to a given CWID

// getStudent must throw an exception if cwid is invalid

// add constructors, destructors, assignment operators if needed

private:

// Add private member variables for your class along with any

// other variables required to implement the public member functions

// TO BE COMPLETED

Registrar.cpp

void Registrar::readTextfile(string filename) {

ifstream myfile(filename);

if (myfile.is_open()) {

cout << "Successfully opened file " << filename << endl;

string courseName;

string cwid;

char grade;

while (myfile >> courseName >> cwid >> grade) {

// cout << cwid << " " << grade << endl;

addLine(courseName, cwid, grade);

}

myfile.close();

}

else

throw invalid_argument("Could not open file " + filename);

}

// return Student object corresponding to a given CWID

// getStudent must throw an exception if cwid is invalid

Student& Registrar::getStudent(string cwid) const {

// TO BE COMPLETED

}

// process a line from the text file

void Registrar::addLine(string courseName, string cwid, char grade) {

// TO BE COMPLETED