#include <iostream>
 
void swap(int *&a, int *&b) 
{
    int *tmp = a;
    a = b;
    b = tmp;
}
 
int main()
{
    int i=1, j=2 ;
 
    int* p_i = &i ;
    int* p_j = &j ;
 
 
    std::cout << "Before swap, i=" << i << " j=" << j << '\n';
    std::cout << "Before swap, p_i=" << p_i << " p_j=" << p_j << "\n\n" ;
    swap(p_i, p_j) ;
    std::cout << "After swap, i=" << i << " j=" << j << '\n' ;
    std::cout << "After swap, p_i=" << p_i << " p_j=" << p_j << '\n' ;
}

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