Pointers in C++

More on Argument Passing

Suppose we want a swap function that works so that the following code:

int p = 1; int q = 2; cout << "p = " << p << " q = " << q << endl; swap(p, q); cout << "p = " << p << " q = " << q << endl;

produces the following output:

p = 1  q = 2
p = 2  q = 1