void passByValue(int x);
void passByReference(int *x);

int main (){
    int rodrigo = 13;
    int marco = 13;


    passByValue(rodrigo);
    passByReference(&marco);

    cout << "rodrigo is now " << rodrigo << endl;
    cout << "marco is now " << marco << endl;

}

void passByValue(int x){
    x = 99;
}

void passByReference(int *x){
    *x=66;
}