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HTML

              
                <p id="title"> Calculator </p>
<div id="calculator">
  <div id="screen"><p id="text"> </p> </div>
  
    <div id="cola">
      <button class="btn" name="1"> 1 </button> 
      <button class="btn" name="2"> 2 </button> 
      <button class="btn" name="3"> 3 </button>
      <button class="operation" name="+"> + </button>
      <button class="btn" name="4"> 4 </button>
      <button class="btn" name="5"> 5 </button>
      <button class="btn" name="6"> 6 </button>
      <button class="operation" name="-"> - </button>
      <button class="btn" name="7"> 7 </button>
      <button class="btn" name="8"> 8 </button>
      <button class="btn" name="9"> 9 </button>
      <button class="operation" name="*"> * </button>
      <button class="clear" name="AC"> AC </button>
      <button class="btn" name="0"> 0 </button> 
      <button class="btn" name="."> . </button>
      <button class="operation" name="/"> / </button>
      <button class="equal" name="="> = </button>
  </div>
</div>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Indie+Flower');
#title{
  color: white;
  text-align: center;
  font-size: 7vmin;
  font-family: 'Indie Flower', cursive;
}
div#screen{
  width: 90%;
  height: 40px;
  position: relative;
  top: 20px;
  border-radius: 5px;
  background-color: black;
  margin: auto;
}
body{
  background-color: black;
}
#text{
  padding-top: 8px;
  padding-left: 20px;
  font-size: 20px;
  color: white;
}
#calculator{
  background-color: grey;
  width: 300px;
  height: 350px;
  margin: auto;
  margin-top: 110px;
  border-radius: 20px;
  position: relative;
}
#cola{
  margin-top: 30px;
  height: 270px;
}

#cola button{
  width: 45px;
  height: 34px;
  margin: 13px;
  margin-top: 20px;
  background-color: black;
  background-image: linear-gradient(135deg, white, white 10%, black 50%);
  border-radius: 10px;
  color: white;
  box-shadow: 0px 3px 4px 2px rgba(100,100,100,0.5);
}
button:hover{
  cursor: pointer;
}
button:focus{
  outline: none;
}
.operation:active, .btn:active, .clear:active{
  position: relative;
  top: 2px;
  box-shadow: none !important;
}
 
.equal{
  position: absolute;
  top: 0;
  right: -1px;
  height: 40px !important;
}
              
            
!

JS

              
                /*
Array []									Array[20,+]
1. Click number >>> Create a variable where you store this number 		Number: 
                >>> Display 							Variable: 40
                >>> Add the specific "name" of the button to variable

2. Click operation >>> If there is no number displayed(beginning) do nothing
		   >>> IF the length of the array is 2 then
			add number to array
			asign to array >> operation(array)
			add the current sign to array
                   >>> ELSE add to array the number and the sign
		   >>> Assign number with ""

3. Click = >>> Transform the value into a number and add it to the array
	   >>> Call operation function()
	   >>> number = ""

Create operation function(array);
	
*/
$(document).ready(function() {
  //acumulator for the operation between any 2 numbers
  var acumulator = [];
  
  var number = "";
  
  //Used to determine if there was an '=' finished operation before
  var bool;
  
  //Adds to the current number displayed the digit you just pushed!:)
  //If there was any operation before, finished with an '=' this emptys the current number
  $(".btn").on("click", function(){
    if(bool){
      number = "";
    }
    bool = false;
    var digit = this.name;
    number += digit;
    $("#text").html(number);
  });
  
  //Does some MAGIC for the chain operations 
  $(".operation").on("click", function() {
    if (number !== "") {
      var sign = this.name;
      if(acumulator.length === 2){
        acumulator.push(number);
        acumulator = operate(acumulator);
        acumulator.push(sign);
        number = acumulator[0];
        $("#text").html(number);
      }
      else{
        acumulator.push(number, sign);
      }
    }
    number = "";
  });
  
  //Also MAGIC for the equal operator
  $(".equal").on("click",function(){
    if((number !== "") && (acumulator.length === 2)){
      acumulator.push(number);
      acumulator = operate(acumulator);
      number = acumulator[0].toString();
      $("#text").html(number);
      bool = true;
      acumulator = [];
    }
  });
  
  //All Clear Button
  $(".clear").on("click",function(){
    number = "";
    $("#text").html(number);
  });
  
  //Takes in an array of 3 elements, the sign being the middle one
  //Returns an array with only one element, the result of the operation beetwen the 2 in the beginning
  function operate(arr) {
    var result;
    arr[0] = parseFloat(arr[0]);
    arr[2] = parseFloat(arr[2]);
    switch (arr[1]) {
      case "+":
        result = arr[0] + arr[2];
        arr = [];
        arr[0] = result;
        break;
      case "*":
        result = arr[0] * arr[2];
        arr = [];
        arr[0] = result;
        break;
      case "/":
        result = arr[0] / arr[2];
        arr = [];
        arr[0] = result;
        break;
      case "-":
        result = arr[0] - arr[2];
        arr = [];
        arr[0] = result;
        break;
    }
    return arr;
  }
});
              
            
!
999px

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