CalcQX ~ the calculator for iOS

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