6.22

#include<iostream>
#include<string>
using namespace std;

void swap(int *&lft, int *&rht)
{
	auto tmp = lft;
	lft = rht;
	rht = tmp;
}

int main()
{
	int i = 42, j = 99;
	auto lft = &i;
	auto rht = &j;
	swap(lft, rht);
	cout << *lft << " " << *rht << endl;

	return 0;
}