H(x) = B(x) mod n (C++ programma)

#include <iostream>
#include <math.h>
using namespace std;

struct bin
{
    bin * next;
    int v;
};

void Input(bin * w, int num)
{
    w->next = new bin;
    w->next->v = num;
    w->next->next = NULL;
}

void Output(bin * temp)
{
    if(temp->next != NULL)
    {
        Output(temp->next);
    }

    if(temp->v != 2)
    {
        cout<<temp->v;
    }

}

void MidSix(bin * temp, int mas[6])
{
    int sum = 0;
    bin * o;
    o = temp;

    while(o->next != NULL)
    {
        sum ++;
        o = o->next;
    }

    sum = (sum - 6) / 2;

    while(sum > 0)
    {
        temp = temp->next;
        sum --;
    }

    while(sum < 6)
    {
        temp = temp->next;
        mas[5 - sum] = temp->v;
        sum ++;
    }

    sum=0;

    cout<<"\nMid:";

    int y=0;
    while(sum<6)
    {
        cout<<mas[sum];

        if(mas[sum] == 1)
        {
            y = y + pow(2,sum);
        }

        sum++;
    }

    for (int e = 0; e < 6; e ++)
    {
        if(mas [5-e] == 1)
        {
            y = y + pow(2,e);
        }
    }

    cout<<"\nDec:"<< y ;

}

int main()
{
    int mas[6];
    bin u, * q, *y;

    q = &u;
    y = &u;
    q->v = 2;
    char end;
    int num, x;

    num = 100;

    do
    {
        x = num % 2;
        Input (q,x);
        q = q->next;
        if(x == 1){num - 1;}

        if(num != 1)
        {
            num = num / 2;
        }
        else{ end = 'Y';}
    }while(end != 'Y');

    cout<<"\nBin:";
    Output(y);
    cout<<"\n";

    MidSix(y->next, mas);

    cout<<"\n\n";
    system("pause");
    return 0;
}