A program for pass by reference

/ passing parameters by reference

#include 

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=" << class="str">", y=" << class="str">", z=" <<>

  return 0;

}

Output:

x=2, y=6, z=14

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