Dan Frakes:
?PCalc also takes advantage of the iPhone?s touchscreen and accelerometer. When performing calculations, a swipe of the LCD to the right invokes the Undo feature; a swipe to the left invokes Redo. (Multiple levels of undo and redo are supported.) And if pressing the Clear and Clear All buttons is too pedestrian for your iPhone-loving hands, give the phone a left-right shake; two shakes equates to Clear, three to Clear All.
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