Converter

User defines measures and the conversion rates between them. The app converts quantities from one measure to another based on these user definitions.

The first time that the app runs, it creates a file, converter.txt, on the device. This file contains some default measures and the conversion rates for the measures. A conversion rate is a simple multiplier number.

The user can add custom conversion definitions. For example if the user thinks that burning off one cookie requires running for 12 minutes, the user can add this line in converter.txt:
1 cookie = 12 minute-of-running
The app then allows conversion of the number of cookies to minutes of running and vice versa.

The user can delete any lines of conversion which are not needed from converter.txt.

The user can change lines too. In particular, the foreign exchange rates change frequently and the user should update these if they are used.