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- #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 << y << z;
- return 0;
- }
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