What is the Currency in (Budapest) Hungary?
No, it is still not the euro, it is the HungarianForint (HUF or Ft) (say four-int). The Hungarian Forint has no change (it used to be filler but not any more). Euro is accepted at several places though, but your safe bet would be to find an Exchange Bureau (abundant in the city center, in plazas and in the shopping street Vaci utca) and change some of your currency into Hungarian Forints. Even better, you can safely rely on your credit card as most major credit cards are accepted anywhere (from stores to restaurants), like Visa, MasterCard, American Express etc. And, unlike in Japan, you cannot pay with your cell phone yet.