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#include <iostream>
using namespace std;
void triple(int&, int&, int&);
int main()
{
int x,y,z;
cout << "Input three integers: ";
cin >> x >> y >> z;
triple(x,y,z); // function call ( argument or actual parameter )
cout << "After call, the numbers are: ";
cout << x << "\t" << y << "\t" << z << endl;
return 0;
}
void triple( int& a, int& b, int& c)
{ a *= 3;
b *= 3;
c *= 3;
return; // omitted
}