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HTML

              
                <html lang="en-US">
<!-- Still in Progress/ Being Worked On -->
<head>

  <title>RDaniels34 | Calculator --- Not Finished</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="css/normalize.css">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css">
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.4.0/css/font-awesome.min.css">
  <link href='https://fonts.googleapis.com/css?family=Montserrat:400,700|Bitter:400,400italic|Josefin+Sans:400,300italic' rel='stylesheet' type='text/css'>

  <style>
    <!-- #main {
        width: 100px;
        height: 200px;
        border: 3px solid #c3c3c3;
        display: -webkit-flex;
        /* Safari */
        -webkit-flex-flow: row-reverse wrap;
        /* Safari 6.1+ */
        display: flex;
        flex-flow: wrap;
        justify-content: space-around;
      }
      
      #main div {
        width: 55px;
        height: 50px;
      }  -->
  </style>
</head>

<body style="background-color: lightyellow;">
  <header>
    <div class="header-div">
      <h1>Calculator</h1>
      <h3>Made by: RDaniels34</h3>
    </div>
  </header>

  <container class="container">

    <div class="well well-lg" id="numberDisplay">
      <div id="numberDisplay1">0</div>
      <br>
      <div id="numberDisplay2" class="display">0</div>
    </div>

    <div id="separator-line"></div>

    <div id="buttonGroup">
      <button type="button" onclick="clrFunction()" value="C" id="clr" class="btn btn-default btn-sm">C</button>
      <button type="button" onclick="divideFunction()" value="/" id="divideNum" class="divideNum operators btn btn-default btn-sm">/</button>
      <button type="button" onclick="timesFunction()" value="X" id="timesNum" class="timesNum btn btn-default btn-sm">X</button>
      <button type="button" onclick="backspaceFunction()" id="backspace" class="backspace btn btn-default btn-sm fa fa-caret-left" style="font-size:20px"></button>
      <button type="button" onclick="sevenFunction()" value="7" id="numbers" class="numbers btn btn-default btn-sm">7</button>
      <button type="button" onclick="eightFunction()" value="8" id="numbers" class="numbers btn btn-default btn-sm">8</button>
      <button type="button" onclick="nineFunction()" value="9" id="numbers" class="numbers btn btn-default btn-sm">9</button>
      <button type="button" onclick="addFunction()" value="+" id="addNum" class="addNum btn btn-default btn-sm">+</button>
      <button type="button" onclick="fourFunction()" value="4" id="numbers" class="numbers btn btn-default btn-sm">4</button>
      <button type="button" onclick="fiveFunction()" value="5" id="numbers" class="numbers btn btn-default btn-sm">5</button>
      <button type="button" onclick="sixFunction()" value="6" id="numbers" class="numbers btn btn-default btn-sm">6</button>
      <button type="button" onclick="subtractFunction()" value="-" id="minusNum" class="minusNum btn btn-default btn-sm">-</button>
      <button type="button" onclick="oneFunction()" value="1" id="numbers" class="numbers btn btn-default btn-sm">1</button>
      <button type="button" onclick="twoFunction()" value="2" id="numbers" class="numbers btn btn-default btn-sm">2</button>
      <button type="button" onclick="threeFunction()" value="3" id="numbers" class="numbers btn btn-default btn-sm">3</button>
      <button type="button" onclick="percentFunction()" value="%" id="percentNum" class="percentNum btn btn-default btn-sm ">%</button>
      <button type="button" onclick="zeroFunction()" value="0" id="numbers" class="numbers btn btn-default btn-sm">0</button>
      <button type="button" onclick="decimalFunction()" value="." id="numbers" class="numbers btn btn-default btn-sm ">.</button>
      <button type="button" onclick="plusminusFunction()" value="+/-" id="plusminus" class="plusminus btn btn-default btn-sm">+/-</button>
      <button type="button" onclick="rd34Function()" id="rd34" class="btn btn-default btn-sm">RD</button>
      <button type="button" onclick="equalsFunction()" val="=" id="equals" class="btn btn-default btn-sm">=</button>
    </div>
  </container>


  <div id="footer">
    Copyright © RDaniels34 - 2016
  </div>

  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
  <script src="vendor/angular.js" type="text/javascript"></script>
  <script src="scripts/app.js" type="text/javascript"></script>

</body>
              
            
!

CSS

              
                /*******************************
         Header
*******************************/

body
/* {background-image:url(https://cdn.shopify.com/s/files/1/0269/7611/products/248_54434c9ede99e_3_1413696670_rustic-table-4.jpeg?v=1444237519);
  background-repeat: no-repeat;
  background-position: 0px 0px;
  /*background-attachment: ;*/

background-size: cover;
*/
}
.header-div {
  margin: 0 0;
  height: 90px;
  background-color: black;
}
.header-div h1 {
  font-size: 35px;
  font-family: "Josefin Sans", Ariel, serif;
  font-weight: 900;
  color: black;
  text-align: center;
  margin-top: 0px;
  margin-bottom: -10px;
  padding-top: 5px;
  padding-bottom: 0;
}
.header-div h3 {
  font-size: 20px;
  font-family: "Josefin Sans", Ariel, serif;
  font-weight: 400;
  color: black;
  padding-top: 0;
  padding-bottom: 4px;
  text-align: center;
  border-bottom: 1px solid black;
}

/***********************************
        Body of Calculator
************************************/
.container {
  /* styles whole body of calculator */
  
  border: 2px solid grey;
  display: block;
  background: linear-gradient(to bottom right, Silver, DarkSlateGrey);
  background-color: grey;
  box-shadow: 10px 10px 15px 1px black;
  height: 420px;
  max-width: 280px;
  min-width: 280px;
  margin-top: 10px;
  padding-top: 0px;
  border-radius: 15px;
}
#numberDisplay {
  /* Display of Calc Output */
  
  height: 95px;
  box-shadow: 2px 2px 10px 1px DarkSlateGrey inset;
  border: 2px black DarkSlateGrey;
  font-family: "Montserrat", Ariel, serif;
  font-weight: 700;
  font-size: 16px;
  color: blue;
  text-align: right;
  width: 225px;
  padding-top: 15px;
  margin-top: 20px;
  margin-left: auto;
  margin-right: auto;
}
#numberDisplay1 {
  height: 16px;
}
#numberDisplay2 {
  height: 16px;
}
#separator-line {
  width: 85%;
  margin-left: 20px;
  border-top: 2px solid DarkSlateGrey;
}

/*****************************
        Buttons
******************************/
.btn:focus {
  /* Removes any outlining from button containers */
  
  outline: 0 !important;
}
.btn {
  /* Button Sizing and Spacing */
  
  display: block;
  width: 45px;
  margin: 4px;
  margin-bottom: 5px;
  text-align: center;
}
#buttonGroup {
  /* Buttons Container */
  
  padding-left: 1px;
  padding-top: 10px;
  align-content: center;
  font-family: "Montserrat", Ariel, serif;
  font-weight: 700;
  color: #000;
  text-align: center;
}

/*********************************
 Function Buttons Style on Hover
*********************************/
#buttonGroup #divideNum:hover,
#buttonGroup #percentNum:hover,
#buttonGroup #plusminus:hover,
#buttonGroup #addNum:hover,
#buttonGroup #minusNum:hover,
#buttonGroup #timesNum:hover,
#buttonGroup #enter:hover,
#buttonGroup #clr:hover,
#buttonGroup #backspace:hover,
#buttonGroup #equals:hover,
#buttonGroup #rd34:hover {
  background-color: silver;
}

/*********************************
  Function Buttons Normal Style
*********************************/
#buttonGroup #divideNum,
#buttonGroup #percentNum,
#buttonGroup #plusminus,
#buttonGroup #addNum,
#buttonGroup #minusNum,
#buttonGroup #timesNum,
#buttonGroup #clr,
#buttonGroup #backspace,
#buttonGroup #rd34 {
  font-weight: 900;
  background-color: lightgrey;
}
#buttonGroup #equals {
  /* Equals Button - Sizing and Style */
  /*align-items: stretch;*/
  
  font-size: 20px;
  padding-top: 2px;
  margin-top: 3px;
  width: 210px;
  height: 40px;
  background-color: lightgrey;
}
#buttonGroup .btn {
  /* Individual Button Styles */
  
  box-shadow: 4px 4px 15px 1px DarkSlateGrey;
  border: 3px solid Grey;
  border-style: ridge;
  border-radius: 15px;
  font-weight: 900;
  font-size: 14px;
}
#buttonGroup .btn:active {
  background-color: lightgrey;
  box-shadow: 0 3px #666;
  transform: translateY(1px);
}

/*************************************
        Footer
*************************************/
#footer {
  font-family: "Bitter", Ariel, serif;
  font-weight: 400;
  text-align: center;
  padding-top: 70px;
  padding-bottom: 30px;
}
              
            
!

JS

              
                /**************************************************** 
   Mathematical Functions Buttons For Top Readout
*****************************************************/

var topNumber = [];
//eval(topNumber.join(''));
///var newAnswer = topNumber; 

function clrFunction() {
  topNumber.splice(0, topNumber.length);
  document.getElementById("numberDisplay1").innerHTML = 0;
}

function divideFunction() {
  topNumber[topNumber.length] = " / ";
  document.getElementById("numberDisplay1").innerHTML = topNumber.join("");
}

function timesFunction() {
  topNumber[topNumber.length] = " X ";
  document.getElementById("numberDisplay1").innerHTML = topNumber.join("");
}

function backspaceFunction() {
  topNumber.splice(topNumber.length - 1, 1);
  document.getElementById("numberDisplay1").innerHTML = topNumber.join("");
  if (topNumber.length == []) {
    document.getElementById("numberDisplay2").innerHTML = "";
  }
}

function subtractFunction() {
  topNumber[topNumber.length] = " - ";
  document.getElementById("numberDisplay1").innerHTML = topNumber.join("");
}

function addFunction() {
  topNumber[topNumber.length] = " + ";
  document.getElementById("numberDisplay1").innerHTML = topNumber.join("");
}

function percentFunction() {
  topNumber[topNumber.length] = "% ";
  document.getElementById("numberDisplay1").innerHTML = topNumber.join("");
}

function rd34Function() {
  document.getElementById("numberDisplay1").innerHTML = "Programming is Fun!";
}

function decimalFunction() {
  topNumber[topNumber.length] = ".";
  document.getElementById("numberDisplay1").innerHTML = topNumber.join("");
}

/********************************************* 
      Upper Display Number Button Functions 
**********************************************/

function oneFunction() {
  topNumber[topNumber.length] = 1;
  document.getElementById("numberDisplay1").innerHTML = topNumber.join("");
}

function twoFunction() {
  topNumber[topNumber.length] = 2;
  document.getElementById("numberDisplay1").innerHTML = topNumber.join("");
}

function threeFunction() {
  topNumber[topNumber.length] = 3;
  document.getElementById("numberDisplay1").innerHTML = topNumber.join("");
}

function fourFunction() {
  topNumber[topNumber.length] = 4;
  document.getElementById("numberDisplay1").innerHTML = topNumber.join("");
}

function fiveFunction() {
  topNumber[topNumber.length] = 5;
  document.getElementById("numberDisplay1").innerHTML = topNumber.join("");
}

function sixFunction() {
  topNumber[topNumber.length] = 6;
  document.getElementById("numberDisplay1").innerHTML = topNumber.join("");
}

function sevenFunction() {
  topNumber[topNumber.length] = 7;
  document.getElementById("numberDisplay1").innerHTML = topNumber.join("");
}

function eightFunction() {
  topNumber[topNumber.length] = 8;
  document.getElementById("numberDisplay1").innerHTML = topNumber.join("");
}

function nineFunction() {
  topNumber[topNumber.length] = 9;
  document.getElementById("numberDisplay1").innerHTML = topNumber.join("");
}

function zeroFunction() {
  topNumber[topNumber.length] = 0;
  document.getElementById("numberDisplay1").innerHTML = topNumber.join("");
}

/**************************************************** 
   Mathematical Function Buttons For Bottom Readout
*****************************************************/

$(document).ready(function() {

  var testNumLength = function(firstNumber) {
    if (firstNumber.length > 9) {
      $("#numberDisplay2").text(firstNumber.substr(firstNumber.length - 9, 9));
      if (firstNumber.length > 15) {
        $("#numberDisplay1").text(firstNumber.substr(firstNumber.length - 15, 15));
        firstNumber = "";
        $("#numberDisplay2").text("Err");
      }
    }
  }
  var topNumber = "";
  //var firstNumber = "";
  var secondNumber = "";
  var answer = "";
  var newAnswer = "";
  var operator = "";

  $("#numberDisplay2").text("0");

  $(".numbers").click(function() {
    topNumber += $(this).text();
    $("#numberDisplay2").text(topNumber);
    testNumLength(topNumber);
  });

  // $(".operators").click(function() {
  //   operator = $(this).text();
  //   secondNumber = firstNumber;
  //   firstNumber = "";
  //   $("#numberDisplay2").text();
  // });

  $(".addNum").click(function() {
    operator = $(this).text();
    secondNumber = topNumber;
    topNumber = "";
    $("#numberDisplay2").text();
  });

  $(".minusNum").click(function() {
    operator = $(this).text();
    secondNumber = topNumber;
    topNumber = "";
    $("#numberDisplay2").text();
    //$("#numberDisplay1").text(newAnswer + operator);
    // answer =  newAnswer - secondNumber;
  });

  $(".divideNum").click(function() {
    operator = $(this).text();
    secondNumber = topNumber;
    topNumber = "";
    $("#numberDisplay2").text();
  });

  $(".timesNum").click(function() {
    operator = $(this).text();
    secondNumber = topNumber;
    topNumber = "";
    $("#numberDisplay2").text();
  });

  $(".percentNum").click(function() {
    if (operator = "-") {
      answer = parseFloat(topNumber) - ((parseFloat(topNumber) * ((parseFloat(secondNumber)) / 100)));
    } else if (operator = "*") {
      answer = parseFloat(topNumber) * (parseFloat(topNumber) * (parseFloat(secondNumber) / 100));
    } else if (operator = "+") {
      answer = parseFloat(topNumber) + (parseFloat(topNumber) * (parseFloat(secondNumber) / 100));
    } else if (operator = "/") {
      answer = (parseFloat(topNumber)) / ((parseFloat(secondNumber) / 100));
    }

    $("#numberDisplay2").text(answer);
  });

  $("#clr").click(function() {
    topNumber = "";
    $("#numberDisplay2").text("0");
    if ($(this).attr("id") == "clr") {
      topNumber = "";
    }
  });

  $("#backspace").click(function() {
    topNumber = topNumber.substring(0, topNumber.length - 1);
    document.getElementById("numberDisplay2").innerHTML = "";
  });

  $("#equals").click(function() {
    if (operator == "+") {
      answer = parseFloat(topNumber) + parseFloat(secondNumber);
    } else if (operator == "-") {
      answer = secondNumber - topNumber;
    } else if (operator == "X") {
      answer = secondNumber * topNumber;
    } else if (operator == "/") {
      answer = secondNumber / topNumber;
    } // else if (operator == "%") {
    //  answer = secondNumber / 100;
    //}

    answer; //newAnswer = 
    //newAnswer = eval(topNumber.join(""));
    $("#numberDisplay2").text(answer.toPrecision(6));
    //$("#numberDisplay2").text(eval(topNumber));
  });
});

              
            
!
999px

Console