Exam CPP

#include "Exam.h"
#include <iostream>
#include <fstream>
#include <ctime>
using namespace std;

Exam::Exam(){
    correctOver=0;
    for(int x=0;x<2;x++)
    for(int y=0;y<4;y++)
        {
            rightPerSec[x][y] = 0;
        }

        for(int i=0;i<100;i++)
        {
            key[i][0] = rand()%5;
            bool distinct = false;
            while(!distinct)
            {
                key[i][1] = rand()%5;
                if(key[i][0]!=key[i][1])
                    distinct = true;
            }
        }
}
//////////////////////////////////////////////////////////////////////////////////
void Exam::writeExam(int a){
    int b = a;
    ofstream output;
    switch(b){
    case 0:
        output.open("Test A.txt");
        break;
    case 1:
        output.open("Test B.txt");
        break;
    case 2:
        output.open("Test C.txt");
        break;
    case 3:
        output.open("Test D.txt");
        break;
    }
    for(int i=0;i<100;i++)
    {
        output<<key[i][0]<<"    "<<key[i][1]<<endl;
    }
    output.close();
    cout<<"done"<<endl;
}
/////////////////////////////////////////////////////////////////////////////////
void Exam::getKey(int pub[100][2]){
    for(int i=0;i<100;i++)
    {
        pub[i][0] = key[i][0];
        pub[i][1] = key[i][1];
    }

}
/////////////////////////////////////////////////////////////////////////////////
void Exam::findCorrect(int pubAnswers[100]){
    for(int x=0;x<100;x++)
        {
            correctOver = correctOver + pubAnswers[x];
            cout<<correctOver<<endl;
        }
}
////////////////////////////////////////////////////////////////////////////////
void Exam::correctSec(int pubAnswers[100]){
    for(int x=0;x<2;x++)
        for(int y=0;y<4;y++)
            for(int z=0;z<100;z++)
            {
                rightPerSec[x][y] =+ pubAnswers[z];
            }
}
/////////////////////////////////////////////////////////////////////////////////
void Exam::WriteResults(int a){

    int b = a;
    ofstream output;
    switch(b){
    case 0:
        output.open("TestRes A.txt");
        break;
    case 1:
        output.open("TestRes B.txt");
        break;
    case 2:
        output.open("TestRes C.txt");
        break;
    case 3:
        output.open("TestRes D.txt");
        break;
    }

        output<<"The kids got "<<correctOver<<" Answers Correct"<<endl;

    output.close();
    cout<<"done"<<endl;

}