pass-by-reference.cpp

#include <iostream>
using namespace std;

void duplicate(int &a, int &b, int &c)
{
 a *= 2;
 b *= 2;
 c *= 2;     
}

int main()
{
    int x=1, y=3, z=7;
    
    duplicate(x,y,z);
    cout << "x=" << x << ", y=" << y << ", z=" << z << endl;

    system("pause");
    return 0;
}

/* output
x=2, y=6, z=14
*/