C++ code for mutual exclusion(ME) with busy waiting using Lock variable

Solution for Mutual exclusion with busy waiting using locked variable in C++ Object Oriented Approach
Note:The output will be displayed in the same folder.

#include <iostream>
#include <stdlib.h>
#include <fstream>
#include <time.h>
using namespace std;
int lock = 0, check;
class process
{
public :
    process()
    {
        counter = 0;
        checkEntry = 0;
    }
    int print(){
        if(counter == 1)
        {
            lock = 0;
            counter = 0;
            return 1;
        }
        if(lock == 0){
            lock = 1;
            if(checkEntry!=1)
                check += 1;
            counter++;
            return 0;
        }


    }
private:
    int counter,checkEntry;

};

int main()
{
    srand(time(NULL));
    ofstream myfile;
    int i = 0,k = 0,a[5] = {0,1,2,3,4},arrLength = 5;
    myfile.open ("example.txt");
    int n;
    process p[5];
    while(check!=5)
    {
        n = rand()%5;

        if(p[n].print())
            myfile << "P" << n << " is in busy wait"<< endl;
        else
            myfile << "P" << n << " is in cr"<<endl;
        k++;

    }
}