Numeral System Calculator

Perfect for students and programmers!
The calculator allows to perform operations with numbers and to convert fractional numbers between numeral systems. Such numeral systems are available: binary, octal, decimal and hexadecimal.
Usage:
let we have to convert a number from binary system:
- touch EditText near label "Bin"
- input binary number
Act similarly to other numeral systems.

In the program you can buy the ability to perform four arithmetic operations on numbers and to view two's complement code.

New in version 1.9:
- backspace button "<<";
- expanded the range of valid numbers (64-bit numbers);
- the ability to define the number of decimal places;
- the ability to view Two's complement code (requires IAP)

Notice: the program needs 3 permissions: billing, access wifi state and read phone state.