Name: Calculator
Rating: 4.8 (34 reviews)
Author: 20.100

This widget is a scientific calculator.

Some key features:
  - It will honor priorities (x and / have priority over + and -, ^ has priority over everything)
  - It computes with double precision even if it displays with reduced number of  digits after the dot. Note that when using the constant Pi and E, it internally stores the full double precision number for more accurate trigonometry results.
  - It shows the stack of operator pending just under the number to give a sense where things stand with priority deferrals. The clear button ("C") successfully clears the stack. It can take several clear to reset everything.
  - It support full standard memory operations (M+ adds t the memory, M- subtract from the memory, MR recalls the memory and MC clears the memory). M is displayed when there is a number in memory.
  - Trigonometry functions can operate using degrees or radians. This is selected in the scientific screen.
  - It keeps the last 4 successful operations so you can go back and see what the computations were. It also displays the current computation (in blue) and if there is an error, it shows the computation that led to the error (in red). The current computation is useful for deep stacking or after using the clear function to remember where things stand.
  - The glance view shows the last result if configured so one can go back to that last number quickly
  - The inv button allows to switch between functions and their inverse. It provide the generic X^y and ysqrt(X), which allows for any power and square roots, without going through painful exp() and ln().
  - Conversions will only be applied when using the cnv button. Conversion preview is on the bottom and different type of conversions and units can be cycled through..

The calculator can be controlled fully by touch or fully with the buttons or a combination.

Touch control:
  - Swipe up or down will switch between standard, scientific conversion functionality
  - Swipe left will provide the history screen to see the last 4 successful computation plus the current one.
  - Swipe right will return back when from the history screen or exit the widget when from one of the calculator screens unless the select button what pushed (see button control), in which case it will exit from the button based entry system.
  - tap digits, operators, conversion for entering computations

Button control (does not apply to Venu series):
  - Push up or down will switch between standard, scientific or conversion functionality
  - Push Menu (holding a few seconds) will provide the history screen to see the last 4 successful computation plus the current one
  - Push back will return back
  - For entering numbers, operation or conversions, first push the start/stop button. A red circle will appear on the first number or operator. Use the up and down button to cycle through the numbers/operators. Push Start/Stop again to enter the number of operation/conversion. To exit from this mode (so that you can switch between standard/scientific/conversion or history screen) push the back button once (twice would exit the widget). 

Display settings (starts with V1.5) are available through Connect IQ or on the device by swiping/Menu pushing while in the history screen

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