ryantomlinson95 / javascriptcalculator

Calculator made to explore javascript functionality

JavaScript Calculator

This program uses Middleman and JavaScript to display a functional calculator

##Requirements##

• Ruby v2.2.2
• Ubuntu 14.04 LTS
• Mozilla Firefox
• The 'middleman' gem

//To install required gem, do:
$ gem install middleman

//The installation process will add one new command to your environment/directory, with features you can use:
$ middleman init
$ middleman server
$ middleman build

NOTE:

• This has only been tested with the above requirements. Other operating systems and other versions of Ruby may also work.

##Starting the Program## To run the program, do:

$ cd <path/to/JavaScriptCalculator/>
$ ruby run.rb

After running run.rb, the program will begin

• Changes can be viewed live while editing /DavisSiteUpgrade/source/*.html.erb

##Use##

###Entering Expressions### This calculator allows you to enter expressions as a whole string such as:

1 + 6 x 4 - 3

As a user, you can expect the calculator to complete the calculation using the standard order of operations, PEMDAS.

###Powers### To calculate the result of a number to the power of another number, you must use the exp button. First press the button then pow( will appear on the screen, then enter the base followed by a comma, then enter the exponent followed by a closed parenthese. The exponent can be a part of any expression and will still be properly evaluated.

x^y  =>  pow(x,y)

###Root### To calculate a root of a number, you must use the √ button. First press the button then sqrt( will appear on the screen, then enter the number whose root you want to take followed by a comma, then enter the root followed by a closed parenthese. The sqrt() function can be a part of any expression and will still be properly evaluated.

x√y  =>  sqrt(y,x)

###π### To use π (pi), simply press the button with the pi symbol on it.

Valid:    2*pi
Invalid:  2pi

###Trig Functions### All three trig functions - Sine, Cosine, and Tangent - are calculated in radians.

###Memory Functions###

• MS will save current result to memory
• MC will reset the number in memory to 0
• M+ will add the current result to the number in memory
• MR will display the number in memory to screen

##Limitations## Due to JavaScript only allowing floating point arithmetic, operations such as 1.2 - 1.1 will have results such as 0.09999999999999987 instead of 0.1 which is a known limitation of javascript.

##Debugging## If firefox opens but the page does not load, check the terminal and look for something like the following:

== The Middleman uses a different port "<some number>" then the configured one "4567" because some other server is listening on that port.
== View your site at "http://VirtualBox.local:<some number>", "http://10.0.2.15:<some number>"

Follow the instructions and type http://VirtualBox.local:<some number> into your browser to view the page.

##Sources## CSS3 3D Button - http://www.paulund.co.uk