Two Line Calculator app for iPhone and iPad

Two Line Calculator is a simple calculator with a two-line display.

Features:
- Two-line display
- BackSpace key
- Right swipe to add to a stored number
- Left swipe to subtract from a stored number
- Tap a stored number which is blow a display,
the number will be put on the top line of a display
- seven digits can be entered
- the results will be displayed 8 digits,
an error will appear in more than nine digits
- It can calculate up to the third decimal place
it is rounded off to the fourth decimal place

Please use after a full verification that this application works properly.