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I have one very basic question,
I would like to know:
what programming languages are used to built bitcoin?
The reference implementation, Bitcoin Core, is written primarily in C++, with various resource files and scripts in other languages.
Another implementation, mainly used in lightweight clients like MultiBit and Bitcoin Wallet (Android), is bitcoinj. It is written in Java.
pretty much all of them. Bitcoin libraries are available in most major flavours.
The original Satoshi client is c++