haven't touched C++ for almost a year so I'm a bit rusty but this is basically http://www.hawkee.com/snippet/8379/ in C++

#include <cstdlib>
#include <iostream>
#include <fstream>
#include <string>

using namespace std;

bool isans(string);

struct Questions
{
    string Q,ans,a,b,c,d;
    bool t;
};

class Quiz
{
    public:
        ifstream file;
        ifstream::pos_type len;
        string line;
        char const* fname;
        Questions *quiz;
        int lines,r,w,t;
        Quiz(char const*);
        ~Quiz(void);
        int getSize(ifstream&);
        void start(void);
        void collect(ifstream&);
        void shuffle(void);
};

Quiz::Quiz(char const* f)
{
    fname = f;
    file.open(f);
    quiz = 0;
    r = w = t = 0;
    lines = getSize(file);
    quiz = new (nothrow)Questions[lines];
    if(quiz == 0)
    {
        file.close();
        cerr << "Error allocating memory!";
    }
    collect(file);
}

Quiz::~Quiz()
{
    if(file.is_open())
        file.close();
    if(quiz != 0)
        delete[] quiz;
}

int Quiz::getSize(ifstream& file)
{
    int a = 0;
    file.seekg(0,ios::beg);
    for(string line;file.good();)
        if (file >> line && line.length() == 1 && isans(line))
            a++;
    return a;
}

void Quiz::collect(ifstream& file)
{
    file.close();
    file.open(fname);
    Questions *p;
    string l;
    for(int a = 1,b = 0;file.good() && getline(file,l) && l != "end";a++)
    {
        p = &quiz[b];
        switch(a)
        {
            case 1:
                p->ans = l;
                break;
            case 2:
                p->Q = l;
                break;
            case 3:
                p->a = l;
                break;
            case 4:
                p->b = l;
                break;
            case 5:
                p->c = l;
                break;
            case 6:
                p->d = l;
                p->t = true;
                b++;a = 0;
        }
    }
}

void Quiz::start()
{
    string input;
    Questions *p;

    for(int a = 0;quiz[a].t;a++)
    {
        p = &quiz[a];
        cout << "Question " << a+1 << ": " << p->Q << endl;
        cout << "A. " << p->a << endl;
        cout << "B. " << p->b << endl;
        cout << "C. " << p->c << endl;
        cout << "D. " << p->d << endl;
        getline(cin,input);
        if(input == "exit" || input == "quit")
            break;
        (input==p->ans)?r++:w++;
        t++;
    }
}

int main()
{
    Quiz Q("PATH\TO\QUIZ\FILE");

    Q.start();
    cout << "\nYou answered " << Q.r << " questions out of " << Q.t << " Correctly.";

    return 0;
}

bool isans(string l)
{
    string a = "A", b = "B", c = "C", d = "D";
    return ((l==a||l==b||l==c||l==d)?true:false);
}