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#include <iostream>
/*
*
*
*
*
*/
int main () {
std::ostream *a = &std::cout; // get address of cout
std::ostream *b = std::cin.tie(&std::cout); // Tie cin and cout
std::ostream *c = std::cin.tie(); // return address of that cin is tied to (cout)
std::cin.tie(0); // Untie by giving null
std::ostream *e = std::cin.tie(); // Check if it's tied, should return null
std::cin.tie(c); // Tie it again to address pointed to by c
std::ostream *f = std::cin.tie(); // Check if it's tied. Should return same address as c or &std::cout
std::cout << a << "\n" << c << std::endl;
std::cout << e << "\n" << f << std::endl;
if(b) // compiler please be quiet
return 0;
}
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