15C Calculator high-end RPN scientific 1984 app for iPhone and iPad

This app is simulator of HP-15c Calculator with below functions.

Swipe left of right on the display to show the back of calculator.

Press the MENU button to open MAIN MENU

Features:
* Decimal Style (1,234.56 1.234,56)

* RPN logic with 4 stack levels plus a last X (LSTx) register.

* 67 addressable registers, used for storage registers or program
steps.

* 19 storage registers in default configuration with 46 registers for programs (appx. 332 program steps).

* Programmable with up to 448 program steps. In this configuration only 3 storage registers are available: R0, R1 and RI

* 10 Flags and 12 conditional tests, such as x = 0, x ≠ 0 and x > y.
Indexed looping via storage gegister I.

* Full storage arithmetic: STO +, −, × and ÷.

* 5 softkeys, labeled A through E.

* Multiple number format: FIXed, SCIentific and ENGineering.

* Trigonometric functions SIN, COS and TAN.

* Hyperbolic trigonometric functions SINH, COSH TANH.

* Three trigonometric modes: DEGrees, RADians and GRADs.

* Reverse trigonometric functions for standard and hyperbolic functions.

* Mean and standard deviation of 2 variables.

* Summation of n, x, x2, y, y2 and xy for statistic calculations of 2 variables.

* Decimal hours and hrs.min.sec. conversions.

* Polar and rectangular conversions.

* Solve and root finder.

* Numeric integration.

* Linear regression.

* Complex numbers.

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