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CSS

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HTML 

              
                <!-- <div class="container-fixed"> -->
<div class="container">
  <div class="calculator">
    <div class="row">
      <div class="col-xs-4 col-md-offset-4 text-center" id="title">
        REVERSE POLISH NOTATION CALCULATOR
      </div>
    </div>
    <div class="row">
      <div class="col-xs-4 col-md-offset-4 text-center" id="rtfm">
        <span id="rtfm" data-toggle="modal" data-target="#help">
          RTFM here
        </span>
        <!-- Modal -->
        <div id="help" class="modal fade" role="dialog">
          <div class="modal-dialog">

            <!-- Modal content-->
            <div class="modal-content">
              <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal">&times;</button>
                <h4 class="modal-title">How to use an RPN calculator?</h4>
              </div>
              <div class="modal-body text-left">
                <p>A reverse Polish notation calculator works like this:</p>
                <ol>
                  <li>Type a number... any number.</li>
                  <li>Press ENT</li>
                  <li>Repeat steps 1 and 2</li>
                  <li>Press an operation button (+-*/)</li>
                </ol>
                <p>Every time the you enter a number followed by ENT, you push a number in the stack. When the stack has two or more numbers the operation buttons become active. When you press an operation button, the calculator pops the two most recent numbers out of the stack, performs the selected operation and pushes the result in the stack.</p>
                <p>An RPN calculator is a fast, elegant and super cool way to perform calculations with fewer keystrokes than with an algebraic calculator.</p>
                <p>Read more about <a href="https://en.wikipedia.org/wiki/Reverse_Polish_notation" target="_blank">RPN on Wikipedia!</a></p>
              </div>
              <div class="modal-footer">
                <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
              </div>
            </div>

          </div>
        </div>
      </div>
    </div>
    <!-- display stack -->
    <div class="row">
      <div id="div-stack" class="col-xs-4 col-md-offset-4 div-display"></div>
    </div>
    <!-- /display stack -->
    <!-- display -->
    <div class="row">
      <div id="div-display" class="col-xs-4 col-md-offset-4 div-display"></div>
    </div>
    <!-- /display -->
    <!-- first row of keys -->
    <div class="row">
      <div class="col-xs-4 col-md-offset-4 div-button-row">
        <div class="col-xs-3 calc-button calc-button-left">CE</div>
        <div class="col-xs-3 calc-button">C</div>
        <div class="col-xs-3 calc-button" id="button-smiley">:)</div>
        <div class="col-xs-3 calc-button operation-button">/</div>
      </div>
    </div>
    <!-- /first row of keys -->
    <!-- second row of keys -->
    <div class="row">
      <div class="col-xs-4 col-md-offset-4 div-button-row">
        <div class="col-xs-3 calc-button calc-button-left">7</div>
        <div class="col-xs-3 calc-button">8</div>
        <div class="col-xs-3 calc-button">9</div>
        <div class="col-xs-3 calc-button operation-button">*</div>
      </div>
    </div>
    <!-- /second row of keys -->
    <!-- third row of keys -->
    <div class="row">
      <div class="col-xs-4 col-md-offset-4 div-button-row">
        <div class="col-xs-3 calc-button calc-button-left">4</div>
        <div class="col-xs-3 calc-button">5</div>
        <div class="col-xs-3 calc-button">6</div>
        <div class="col-xs-3 calc-button operation-button">-</div>
      </div>
    </div>
    <!-- /third row of keys -->
    <!-- fourth row of keys -->
    <div class="row">
      <div class="col-xs-4 col-md-offset-4 div-button-row">
        <div class="col-xs-3 calc-button calc-button-left">1</div>
        <div class="col-xs-3 calc-button">2</div>
        <div class="col-xs-3 calc-button">3</div>
        <div class="col-xs-3 calc-button operation-button">+</div>
      </div>
    </div>
    <!-- /fourth row of keys -->
    <!-- fifth row of keys -->
    <div class="row">
      <div class="col-xs-4 col-md-offset-4 div-button-row">
        <div class="col-xs-6 calc-button calc-button-left">0</div>
        <div class="col-xs-3 calc-button">.</div>
        <div class="col-xs-3 calc-button">ENT</div>
      </div>
    </div>
    <!-- /fifth row of keys -->
  </div>
  <!--   </div> -->
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Montserrat);
@font-face {
  font-family: "digital-7";
  src: url(https://dl.dropboxusercontent.com/u/393119/web/digital-7%20%28mono%29.ttf) format("truetype");
}

$brokenwhite: #ddd;
$border: #c0c0c9;
$button: #333;
$background: #057;
$display: #beb;
$calc-width: 390px;

body {
  background-color: $background;
}

#title {
  font-family: montserrat;
  font-size: 1.5em;
  color: $brokenwhite;
}

.calculator {
  margin-top: 80px;
}

.div-display {
  width: $calc-width !important;
  font-family: "digital-7";
  font-size: 3em;
  text-align: right;
  color: $button;
  background-color: $display;
  height: 1.5em;
  padding-right: .75em;
  border-left: solid;
  border-right: solid;
  border-color: $border;
}

#div-display {
  border-bottom: solid;
  border-color: $border;
}

#div-stack {
  border-top: solid;
  border-color: $border;
  text-align: left;
}

.div-button-row {
  width: $calc-width !important;
  font-family: "verdana";
  font-size: 2em;
  text-align: center;
  background-color: $button;
  padding: 0px;
}

.calc-button {
  color: white;
  border-right: solid;
  border-bottom: solid;
  // color: $display;
  border-color: $border;
  height: 1.5em;
}

.calc-button:hover {
  cursor: pointer;
}

.calc-button-left {
  border-right: solid;
  border-left: solid;
  border-color: $border
}

.calc-button-pressed {
  background-color: blue;
}

.calc-button-inactive {
  color: gray;
}

.tissit {
  text-align:center;
  font-size:.9em;
  height: 1.65em;
}

#rtfm {
  color: gray;
}

#rtfm:hover {
  cursor: pointer;
}
!

JS 

              
                $(document).ready(function() {
  var stack = [];
  var operationDone = false;
  var lastButtonPressed = null;
  $(".operation-button").addClass("calc-button-inactive");

  clearDisplay();
  $(".calc-button").click(function(event) {
    if (lastButtonPressed) {
      lastButtonPressed.removeClass("calc-button-pressed");
    }
    var btnPressed = $(this).html();
    if (btnPressed === "C") {
      lastButtonPressed = $(this).addClass("calc-button-pressed");
      clearDisplay();
      clearStackDisplay();
      stack = [];
    } else if (btnPressed === "CE") {
      lastButtonPressed = $(this).addClass("calc-button-pressed");
      clearDisplay();
    } else if ("+-*/".indexOf(btnPressed) !== -1 && stack.length > 1) {
      //console.log(stack.length);
      lastButtonPressed = $(this).addClass("calc-button-pressed");
      if (btnPressed === "+") {
        stack = sum(stack);
        operationDone = true;
      } else if (btnPressed === "-") {
        stack = sub(stack);
        operationDone = true;
      } else if (btnPressed === "*") {
        stack = multiply(stack);
        operationDone = true;
      } else if (btnPressed === "/") {
        stack = divide(stack);
        operationDone = true;
      }
    } else if (btnPressed === "ENT") {
      lastButtonPressed = $(this).addClass("calc-button-pressed");
      stack.push(parseFloat(getDisplay()));
      setDisplayStack(stack);
      clearDisplay();
    } else if ("0123456789.".indexOf(btnPressed) !== -1) {
      lastButtonPressed = $(this).addClass("calc-button-pressed");
      if (operationDone) {
        clearDisplay();
        operationDone = false;
      }
      if (btnPressed === "." && getDisplay().indexOf(".") === -1 || btnPressed !== ".") {
        addToDisplay($(this).html());
      }
    }
    if (stack.length < 2) {
      $(".operation-button").addClass("calc-button-inactive");
    } else {
      $(".operation-button").removeClass("calc-button-inactive");
    }
  });
})

function addToDisplay(d) {
  var oldValue = getDisplay();
  if (oldValue === "0") {
    $("#div-display").html("");
    oldValue = "";
  }
  if (oldValue.length < 18) {
    var newValue = oldValue + d;
    setDisplay(newValue);

    if (newValue === "715517") {
      tissit();
    }
  }
}

function setDisplay(s) {
  $("#div-display").html(s);
}

function setDisplayStack(s) {
  $("#div-stack").html(s.join(" "));
}

function getDisplay() {
  return $("#div-display").html();
}

function clearDisplay() {
  $("#div-display").html("0");
}

function clearStackDisplay() {
  $("#div-stack").html("");
}

function sum(stack) {
  stack.push(stack.pop() + stack.pop());
  clearDisplay();
  setDisplayStack(stack);
  return stack;
}

function sub(stack) {
  var last = stack.pop();
  stack.push(stack.pop() - last);
  clearDisplay();
  setDisplayStack(stack);
  return stack;
}

function multiply(stack) {
  stack.push(stack.pop() * stack.pop());
  clearDisplay();
  setDisplayStack(stack);
  return stack;
}

function divide(stack) {
  var last = stack.pop();
  stack.push(stack.pop() / last);
  clearDisplay();
  setDisplayStack(stack);
  return stack;
}

function tissit() {
  $("#button-smiley").addClass("tissit");
  $("#button-smiley").html("(.)(.)");
}
!
999px

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