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#include <iostream>
 
using namespace std;
 
void squareMe(int a, int &b)
{
    b = a*a;
}
 
int main(int argc, char *argv[])
{
    int a = 2, b = 0;
 
    squareMe(a, b);
 
    cout << b << endl;
 
    return 0;
}

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