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! Follow us on Facebook: http://www.facebook.com/pages/CalcQX/171355629551053