#include <iostream>
#include <cstdlib>
using namespace std;

int roll(int);
void roll6(int&);

int main()
{
    int a = 100;
    //cout << "&a=" << &a << endl;
    int z = roll(a);
    cout << z << endl;

    roll6(a);
    cout << a << endl;
}

int roll(int range)
{
  //      cout << "&range=" << &range << endl;

    int r = rand() % range + 1;
    return r;
}

void roll6(int& r)
{
    r = rand() % 6 + 1;
}