I have not tested it with stock Android Marshmellow (version 6) yet, but since stock Android Nougat (version 7), the calculator app that relies on *CRCalc* can display **indefinite digits behind decimal.** They can be accessed by side-swiping. Also, the advanced calculation options are accessible in the vertical calculator! But Samsung's precluded calculator software (since at least 2013) has a calculation history that the stock Android pocket calculator app lacks. Desktop Linux users can access unlimited digits behind decimal through the *`bc`* command-line tool. The *`expr`* command only works with integers.