#include <iostream>
using namespace std;
void quadrupler(int& n)
{
n = 4 * n;
}
int main()
{
int x[3] = {7, 8, 9};
int number = 2;
quadrupler(x[number]);
quadrupler(x[2]);
quadrupler(x[3]);
quadrupler(number);
quadrupler(*x);
return 0;
}
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