No more forgetting what've you calculated and it's easy to going backward or forward to your calculation with undo and redo feature.
Once you're done calculating, you can add note to each step of your calculation.
Finally, you can export it into PDF for documentation use.
Undo and Redo button:
Go backward to your previous calculation or forward to your saved calculation.
Undo and redo only works on calculation, not anything you typed on main screen.
Tips button (15%, and 18%):
Convert current value into pushed tip percentage, but not creating/adding calculation.
You put 100, and then push 15%, main screen should display 15.
But no such as 100 * 0.15 calcualtion created.
Menu - Export
Export all your calculation list to PDF.
The export path on your sdcard is: /memcal/memcal_[day]_[year]_[hour]_[min]_[sec].pdf