#include
using namespace std;
void f(int &i); // i is a reference parameter
int main()
{
int val = 1;
cout << "Old value for val: " << val << '\n';
f(val);
cout << "New value for val: " << val << '\n';
return 0;
}
void f(int &i)
{
i = 10;
}
Old value for val: 1
New value for val: 10