Hexadecimal calc

A calculator for all that supports Hexadecimal numbers. Hexadecimal calculator, which is able to add, subtract, multiply and divide numbers in Hexadecimal format number.

Any number can be represented in symbols 0123456789ABCDEF.

Hex numbers are up to 16 digits.

[AC] is All Clear, and [BS] is BackSpace(Delete a last inputed number).
Operation is performed according to input sequences.
i.e. 2 + 3 x 4 = becomes 20.
(when "2 + 3 x ", result area becomes 5.)