Mysterious Boxes

Computer Science Level 3

#include <iostream>
using namespace std;
int func(int N, int M){
    while(N [Box1] M){
        N [Box2] M;
    }
    return N;
}
int main(){
    cout<<func(3,3);
    cout<<func(7,3);
    cout<<func(5,3);
    return 0;
}

0 1 2

What are the operators hidden in the boxes in line 4 and 5 of the C++ program above such that you get the desired output ? (Enter the operator numbers, described below, as answer like Box1Box2)

1 2	`1. == 2. != 3. < 4. > 5. >= 6. <= 7. /= 8. *= 9. += 10. -= 11. && 12. \|\|`