Easy Calc ($0,99):Youtube video: Easy Calc Video
+ Variables support like in spreadsheets.
+ The result is computed in real-time while the user inserts the input.
+ All inputs can be edited.
+ An arbitrary number of calculations can be created and edited at the same time.
+ The whole calculation and the result are displayed on the screen.
+ Common calculators display error when the user inserts wrong input. This new calculator highlights wrong characters in the calculation and ignors them for the computing.
+ Cut, Copy, Paste functionality.
