Just a simple project I made to demonstrate some concepts in C++. Here's the video where I teach this project: http://www.youtube.com/watch?v=NIoEVxe-rpk

main.cpp

//
//  main.cpp
//  StudentInformationAnalyzer
//
//  Created by Adam Spindler on 1/4/14.
//  Copyright (c) 2014 Adam Spindler. All rights reserved.
//

#include <iostream>
#include <exception>
#include <string>

#include "Student.h"
#include "StudentList.h"

using namespace std;

void printStudent(Student student)
{
    cout << "Name: " << student.getName() << endl;
    cout << "ID: " << student.getId() << endl;
    cout << "GPA: " << student.getGPA() << endl;
    cout << endl;
}

int main(int argc, const char * argv[])
{
    try
    {
        if (argc != 2)
        {
            cout << "Usage: StudentInformationAnalyzer PATH_TO_STUDENT_FILE" << endl;
            return -1;
        }
        
        string path(argv[1]);
        StudentList list(path);
        
        cout << "Valedictorian: " << endl << endl;
        printStudent(list.getValedictorian());
        
        cout << endl << "Honor Role Students: " << endl << endl;
        for (Student s : list.getHonorRollStudents())
            printStudent(s);
        
        cout << endl << "Failing Students: " << endl << endl;
        for (Student s : list.getFailingStudents())
            printStudent(s);
    }
    catch (exception &e)
    {
        cout << "An exception was thrown." << endl;
        cout << "\t" << e.what() << endl;
        
        return -1;
    }
    
    return 0;
}

Student.cpp

//
//  Student.cpp
//  StudentInformationAnalyzer
//
//  Created by Adam Spindler on 1/4/14.
//  Copyright (c) 2014 Adam Spindler. All rights reserved.
//

#include "Student.h"

using namespace std;

Student::Student(string studentInformation)
{
    stringstream studentStream(studentInformation);
    studentStream >> firstName;
    studentStream >> lastName;
    studentStream >> id;
    studentStream >> gpa;
}

string Student::getFirstName()
{
    return firstName;
}

string Student::getLastName()
{
    return lastName;
}

string Student::getName()
{
    return firstName + " " + lastName;
}

int Student::getId()
{
    return id;
}

double Student::getGPA()
{
    return gpa;
}

Student.h

//
//  Student.h
//  StudentInformationAnalyzer
//
//  Created by Adam Spindler on 1/4/14.
//  Copyright (c) 2014 Adam Spindler. All rights reserved.
//

#ifndef __StudentInformationAnalyzer__Student__
#define __StudentInformationAnalyzer__Student__

#include <string>
#include <sstream>

class Student
{
public:
    Student(std::string studentInformation);
    
    std::string getFirstName();
    std::string getLastName();
    std::string getName();
    int getId();
    double getGPA();
    
private:
    std::string firstName;
    std::string lastName;
    int id;
    double gpa;
};

#endif

StudentList.cpp

//
//  StudentList.cpp
//  StudentInformationAnalyzer
//
//  Created by Adam Spindler on 1/4/14.
//  Copyright (c) 2014 Adam Spindler. All rights reserved.
//

#include "StudentList.h"

#define FAILING_GRADE 65
#define HONORROLE_GRADE 90

using namespace std;

StudentList::StudentList(string filePath)
{
    ifstream studentFile(filePath);
    
    string lineContents;
    while (!studentFile.eof())
    {
        getline(studentFile, lineContents);
        
        Student s(lineContents);
        students.push_back(s);
    }
    studentFile.close();
    
    sort(students.begin(), students.end(), [](Student &s1, Student &s2)
    										{
                                                return s1.getGPA() > s2.getGPA();
                                            });
}

Student StudentList::getValedictorian()
{
    if (students.size() == 0 || students.at(0).getGPA() < FAILING_GRADE)
        throw NoValedictorianException();
    return students.at(0);
}

vector<Student> StudentList::getHonorRollStudents()
{
    vector<Student> toReturn;
    for (Student s : students)
    {
        if (s.getGPA() < HONORROLE_GRADE)
            break;
        else
        	toReturn.push_back(s);
    }
    
    return toReturn;
}

vector<Student> StudentList::getFailingStudents()
{
    vector<Student> toReturn;
    for (vector<Student>::reverse_iterator iter = students.rbegin(); iter < students.rend(); iter++)
    {
        if (iter->getGPA() >= FAILING_GRADE)
            break;
        else
            toReturn.push_back(*iter);
    }
    
    return toReturn;
}

StudentList.h

//
//  StudentList.h
//  StudentInformationAnalyzer
//
//  Created by Adam Spindler on 1/4/14.
//  Copyright (c) 2014 Adam Spindler. All rights reserved.
//

#ifndef __StudentInformationAnalyzer__StudentList__
#define __StudentInformationAnalyzer__StudentList__

#include <string>
#include <vector>
#include <fstream>
#include <algorithm>
#include <exception>

#include "Student.h"

class StudentList
{
public:
    StudentList(std::string filePath);
    
    Student getValedictorian();
    std::vector<Student> getHonorRollStudents();
    std::vector<Student> getFailingStudents();
    
private:
    std::vector<Student> students;
};

class NoValedictorianException : public std::exception
{
public:
    const char *what() const throw()
    {
        return "StudentList: No Valedictorian";
    }
};

#endif

Hi Adam, first of all thanks for your tutorial, I found it on youtube and it really helped me. Here is my question, I have programmed the first part (until we print all the students data by console). I have copied your code but there is something that doesn´t work in the same way. When I print the students data by console, my program creates 2 member for each student, one with the data and another one empty at the end.For example if I just have one line in my txt file it shows me this:
Name: Michael Scott
ID: 5423
GPA: 76.9
Name:
ID
GPA
Do you know why I could be happening?? Thank from Spain!

I think you should check while reading file that the file is empty or not.
This will not create garbage.
Because when i give input an empty file it pushes garbage value into vector and which in turn increases size by 1. So, i think ifixed it.
here is the code

StudentList.cpp

#include "StudentList.h"

#define FAILING_GRADE 65
#define HONORROLE_GRADE 90
#include<iostream>
using namespace std;

StudentList::StudentList(string filePath)
{
    ifstream studentFile(filePath);

    string lineContents;
    if(studentFile.peek() == '\0'){
        throw NoValedictorianException();
    }else{

        while (!studentFile.eof())
    {
        getline(studentFile, lineContents);

        Student s(lineContents);
        students.push_back(s);
    }
    }

    studentFile.close();

    sort(students.begin(), students.end(), [](Student &s1, Student &s2)
    										{
                                                return s1.getGPA() > s2.getGPA();
                                            });
}

Student StudentList::getValedictorian()
{

    if (students.at(0).getGPA() < FAILING_GRADE){
        throw NoValedictorianException();
    }

    return students.at(0);
}

vector<Student> StudentList::getHonorRollStudents()
{
    vector<Student> toReturn;
    for (Student s : students)
    {
        if (s.getGPA() < HONORROLE_GRADE)
            break;
        else
        	toReturn.push_back(s);
    }

    return toReturn;
}

vector<Student> StudentList::getFailingStudents()
{
    vector<Student> toReturn;
    for (vector<Student>::reverse_iterator iter = students.rbegin(); iter < students.rend(); iter++)
    {
        if (iter->getGPA() >= FAILING_GRADE)
            break;
        else
            toReturn.push_back(*iter);
    }

    return toReturn;
}

Also you should remove #include "Student.h" from main.cpp file.