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              <div class="container ">
  <div class="row">
    <span id="input" class="animated fadeInDownBig"></span> 
  </div>
  <div class="row" id="button-background">
    <div class="row animated fadeInUpBig"
         style="animation-delay: 100ms;">
      <span><a class="waves-effect waves-light btn red">C</a></span>
      <span><a class="waves-effect waves-light btn grey darken-4">%</a></span>
      <span><a class="waves-effect waves-light btn  grey darken-4">!</a></span>
      <span><a class="waves-effect waves-light btn  grey darken-4">&#960</a></span>
    </div>
    <div class="row animated fadeInUpBig"
         style="animation-delay: 200ms;">
      <span><a class="waves-effect waves-light btn">7</a></span>
      <span><a class="waves-effect waves-light btn">8</a></span>
      <span><a class="waves-effect waves-light btn">9</a></span>
      <span><a class="waves-effect waves-light btn  grey darken-4">+</a></span></div>
    <div class="row animated fadeInUpBig"
         style="animation-delay: 300ms;">
      <span><a class="waves-effect waves-light btn">4</a></span>
      <span><a class="waves-effect waves-light btn">5</a></span>
      <span><a class="waves-effect waves-light btn">6</a></span>
      <span><a class="waves-effect waves-light btn  grey darken-4">-</a></span>
    </div>
    <div class="row animated fadeInUpBig"
         style="animation-delay:  400ms;">
      <span><a class="waves-effect waves-light btn">1</a></span>
      <span><a class="waves-effect waves-light btn">2</a></span>
      <span><a class="waves-effect waves-light btn">3</a></span>
      <span><a class="waves-effect waves-light btn grey darken-4">÷</a></span>
    </div>
    <div class="row animated fadeInUpBig"
         style="animation-delay: 500ms;">
      <span><a class="waves-effect waves-light btn">0</a></span>
      <span><a class="waves-effect waves-light btn">.</a></span>
      <span><a class="waves-effect waves-light btn black">=</a></span>
      <span><a class="waves-effect waves-light btn grey darken-4">x</a></span>
    </div>
  </div>
<p>by <strong>Suleyman Tekin</strong></p>
            
          
!
            
              * {
  margin: 0px;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Roboto Mono', monospace;
}

body {
  background-color: #b0bec5;
  color: white; 
  -webkit-user-select: none; /* Chrome/Safari */        
  -moz-user-select: none; /* Firefox */
  -ms-user-select: none; /* IE10+ */
}

.container {
  width: 304px;
  height: 617px;
  background-image: url(https://www.mobicommerce.net/wp-content/uploads/2017/03/phone_1x.png);
/*  background-repeat: no-repeat;
  background-size: contain;
  */
  background-position: center;
  border-radius: 40px;
  background-color: #004d40;
  box-shadow: -1px 0 0 #004d40;

}

#input {
  color: white;
  position: absolute;
  margin: 120px 0px 0px 11px;
  width: 304px;
  font-size: 20px;
  height: 150px;
  padding: 20px 20px;
  background: black;
  overflow: hidden;
  user-select: none;
}



#button-background{
  padding: 270px 0px 0px 31px;
}

@media screen and (min-width: 990px) {
  #button-background {
    padding-left:26px;

  }
  
}

@media screen and (min-width: 1200px) {
  #button-background {
    padding-left:21px;

  }
}
p{
  text-align:center;
  color: #424242;
}



            
          
!
            
              /*
 * By Suleyman Tekin
 */

var flag = false;
$("a").click(function() {
  switch ($(this).text()) {
    case ".":
    case "0":
    case "1":
    case "2":
    case "3":
    case "4":
    case "5":
    case "6":
    case "7":
    case "8":
    case "9":
      if(flag){$("#input").text("");}
      $("#input").append($(this).text());
      flag = false;
      break;
      
    case "-":
    case "+":
    case "÷":
    case "x":
    case "%":
      if (checkOperator()) {
        $("#input").append($(this).text());
        flag=false;
      }
      break;
      
    case "=":
      if (checkOperator()) {
        var inputResult = $("#input").text();
        inputResult = inputResult.replace(/÷/g, "/");
        inputResult = inputResult.replace(/x/g, "*");
        var result = eval(inputResult);
        $("#input").text(result);
        flag = true;
      }
      break;
      
    case "C":
      $("#input").text("");
      break;
      
    case 'π':
      var str = $("#input").text();
      var last = str[str.length - 1]
      if("-+x÷%".indexOf(last) != -1){
        $("#input").append("3.1415926535");
      }else{
        $("#input").text("3.1415926535");
      }
      flag = true;
      break;
      
    case '!':
      var str = $("#input").text()
          if(!/[\+\-x÷\%]/.test(str) && str.length != 0){
            $("#input").text(factorial(Number(str)));
            flag = true;
          }
      break;
  }
});

//Checks if the number is an operator if it is return true else false
function checkOperator() {
  var str = $("#input").text();
  var last = str[str.length - 1];
  var operators = "-+x÷%";
  if (operators.indexOf(last) == -1) {
    if (str.length == 0) {
      return false;
    }
    return true;
  }
  return false;
}


//Calculates the factoriel of the given number
function factorial (n) {
  var result = 1;
  if (n == 0 || n == 1){
    return 1;
  } else{
    for(var i = 1; i <= n; i++){
      result *= i;
    }
    return result;
  }
}
            
          
!
999px
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