CalcQX ~ the calculator

Using CalcQX, no longer double checking the answer by doing the calculation again!
Standard Mode: Works like the way billions of real standard calculators in the world do.
Engineering Mode: Capable of doing complex scientific calculation, but remains easy-to-use as a standard calculator.
Large buttons and easy-to-use. CalcQX gives you seamless calculation experience like a real calculator you used in daily life.
CalcQX is a general purpose calculator designed to meet daily calculation requirement with easy-to-use, fully reversible, convenient memory slots, and beautifull, info-rich screen.
CalcQX features:
* iPad/iPhone/iPod Retina display ready for vivid and elegant image
* Up to 50 memory slots for historical calculations/expressions
* Swipe-right to undo, swipe-left to redo at any step during calculation
* Jump into any step of calculation to modify operator or operand
* Info-rich display
* Scientific function support.
* Percent button will behave like real calculator
* 4 additional memory slots (M1 ~ M4) for calculation (Tap-and-hold or M+/M- to memory the number currently shown on the screen and tap again to recall)
* Reusable expressions/results
* Clipboard/email support.
* More great features, but even easier to use than build-in calculator. You will love it!

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