#include
using namespace std;
ostream &sethex(ostream &stream)
{
stream.unsetf(ios::dec | ios::oct);
stream.setf(ios::hex | ios::uppercase | ios::showbase);
return stream;
}
// Reset flags.
ostream &reset(ostream &stream)
{
stream.unsetf(ios::hex | ios::uppercase | ios::showbase);
stream.setf(ios::dec);
return stream;
}
int main()
{
cout << sethex << 100 << '\n';
cout << reset << 100 << '\n';
return 0;
}