#include <iostream>
void Swatp(std::string *j,std::string *k) {
    std::string l = *j;
    *j = *k;
    *k = l;
}
int main() {
    std::string j = "Are you happy? if you are happy them you die.";
    std::string k = "Hello world!";
    std::cout << k << std::endl;
    Swatp(&j,&k);
    std::cout << k << std::endl;
    return 0;
}