3 array and common element

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//// Posted By Ivan Jhahy ///
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#include <iostream>
using namespace std;

int main(){
        srand(time(NULL));
        int dim = rand()%20;
        cout << dim;
        int primo[dim], secondo[dim], terzo[dim], i, ricorrenza;
        cout << primo[dim] << endl;
        cout << secondo[dim] << endl;
        cout << terzo[dim] << endl;
        while (i<dim){
               primo[i] = rand()%100;
               cout << primo[i] << endl;
               secondo[i] = rand()%100;
               cout << secondo[i] << endl;
               terzo[i] = rand()%100;
               cout << terzo[i] << endl;
               if (primo[i] && secondo[i] && terzo[i])
                  ricorrenza = primo[i];
                  cout << ricorrenza << endl;
        }
        system("PAUSE");
        return 1;

}