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HTML

              
                <div class="container">
	<div class="everything shadow">
		<p id="only">CASIO CopyCat</p>
		<div id="theOuterBorder">
			<div class="well well-md">
				<p id="theCalculation"></p>
				<p id="theResult"></p>
			</div>
		</div>

	<div class="row">
		<button class="btn btn-default" id="del">DEL</button>
		<button class="btn btn-default" id="AC">AC</button>
	</div>	
	<div class="row">
		<button class="btn btn-default" id="exp">^</button>	
		<button class="btn btn-default theXters">π</button>
		<button class="btn btn-default theXters">sin</button>
		<button class="btn btn-default theXters">cos</button>
		<button class="btn btn-default theXters">tan</button>
	</div>
	<div class="row">
		<button class="btn btn-default theNumbers">7</button>
		<button class="btn btn-default theNumbers">8</button>
		<button class="btn btn-default theNumbers">9</button>
		<button class="btn btn-default theXters">(</button>
		<button class="btn btn-default theXters">)</button>
	</div>	
	<div class="row">
		<button class="btn btn-default theNumbers">4</button>
		<button class="btn btn-default theNumbers">5</button>
		<button class="btn btn-default theNumbers">6</button>
		<button class="btn btn-default" id="theDif">x</button>
		<button class="btn btn-default theXters">/</button>
	</div>	
	<div class="row">
		<button class="btn btn-default theNumbers">1</button>
		<button class="btn btn-default theNumbers">2</button>
		<button class="btn btn-default theNumbers">3</button>
		<button class="btn btn-default theXters">+</button>
		<button class="btn btn-default theXters">-</button>
	</div>	
	<div class="row">
		<button class="btn btn-default theNumbers">0</button>
		<button class="btn btn-default theXters">.</button>
		<button class="btn btn-default" id="exe">EXE</button>
	</div>

	</div>
</div>
              
            
!

CSS

              
                body {
	background-color: #757462; 
}

#theOuterBorder {
	border: 2px solid black;
	padding-top: 15px; 
	margin: 10px;
	border-radius: 5%;

} 

#only {
	margin-top: 5px;
	color: black;
	font-family: 'Lobster', cursive;
}

.btn {
  	margin-bottom: 5px;
  	border: 1px solid black;
  	width: 50px;
  	display: inline;
	box-shadow: 0 8px 6px -6px black;
	border-radius: 10px;
	font-weight: 600;
}

#exe {
	width: 50%;
}

#theResult {
	text-align: right;
}

#theCalculation {
	text-align: left;
}

.well {
	height: 100px;
	border: 2px rgb(10, 10, 10) solid;
	width: 90%;
	margin-left: 5%;
   	box-shadow: inset 0 0 10px #000000;
}

.everything {
	margin-left: auto;
	margin-right: auto;
	display: block;
    border-radius: 5px;
    border: 1px solid black;
    width: 300px;
    text-align: center;
    margin-top: 10%;
    padding: 5px 5px;
    background-color: #9898a0;
    border-radius: 6%;
    box-shadow:  7px 10px 24px 1px #000000;
} 

#exe, #AC, #del {
	background-color: black;
	color: white;
}


              
            
!

JS

              
                var TheMathCalculation = "";
var previousTarget = "<h1><h1>"; // assigned a random tag to it to avoid it being null

$(".theNumbers").on("click", function() {
	if ($("#theCalculation").html().length <= 25) {
		var i = $(this).text();
		if (previousTarget.innerHTML === ("sin" || "cos" || "tan")) {
			TheMathCalculation += i + ")";
			$("#theCalculation").html($("#theCalculation").html() + "(" + i + ")");		
		} else {
			TheMathCalculation += i;
			$("#theCalculation").html($("#theCalculation").html() + i);
		}
		previousTarget=this;
	}
})

$(".theXters").on("click", function() {
	var i = $(this).text();
	if ($("#theCalculation").html().length <= 25) {
		$("#theCalculation").html($("#theCalculation").html() + i);
		switch(i){
			case "π": 
				TheMathCalculation += "Math.PI";
				break;
			case "sin": 
				TheMathCalculation += "Math.sin(";
				break;
			case "cos":
				TheMathCalculation += "Math.cos(";
				break;
			case "tan":
				TheMathCalculation += "Math.tan(";
				break;
			default:
				TheMathCalculation += i;
		}
		previousTarget = this;
	}
})

var theAboveToString = "";
var indexes = [];

$("#exe").on("click", function() {
	var theMathResult = "";
	indexes = [];
	try {
		if (TheMathCalculation === "Math.PI") {
			theMathResult = eval(TheMathCalculation);
			$("#theResult").html(theMathResult);
		} else {
			//console.log(TheMathCalculation)
			theMathResult = eval(TheMathCalculation);
			$("#theResult").html(theMathResult.toPrecision(2));
			//the below code i used to deal with the decimals but it doesn't work so well
			//theAboveToString = theMathResult.toString().split("");
			//if (theAboveToString.indexOf(".") !== -1) {
			//	var idx = theAboveToString.indexOf("0");
			//	while (idx !== -1) {
  			//		indexes.push(idx);
  			//		idx = theAboveToString.indexOf("0", idx + 1);
  			//		if (true) {}
  			//		var newResult = theAboveToString.slice(0, indexes[1]).join("")
  			//		$("#theResult").html(newResult);
			//	}
			//} //else {
			//	$("#theResult").html(theMathResult);
			} 
			//console.log(theAboveToString)
		}
	catch(err) {
    $("#theResult").html("Syntax ERROR");
	}

})

$("#del").on("click", function(){
	$("#theResult").empty();

	var theSpec = $("#theCalculation").html().length-1;
	var theCalHtml = $("#theCalculation").html();
	var theResultemov = "";

	if (theCalHtml[theSpec] == "^") {
		TheMathCalculation = TheMathCalculation.slice(0, -2);
		$("#theCalculation").html(theResultemov);
	} else if (theCalHtml[theSpec] === ("n" || "s")) {
		TheMathCalculation = TheMathCalculation.slice(0, -8);
		theResultemov = theCalHtml.slice(0, -3);
		$("#theCalculation").html(theResultemov);
	} else if (theCalHtml[theSpec] === "π") {
		TheMathCalculation = TheMathCalculation.slice(0, -7);
		theResultemov = theCalHtml.slice(0, -1);
		$("#theCalculation").html(theResultemov);
	} else {
		TheMathCalculation = TheMathCalculation.slice(0, -1);
		theResultemov = theCalHtml.slice(0, -1);
		$("#theCalculation").html(theResultemov);
	}	
})

$("#AC").on("click", function(){
	$("#theCalculation").empty();
	$("#theResult").empty();
  TheMathCalculation = "";
})

$("#exp").on("click", function(){
	if ($("#theCalculation").html().length <= 25) {
		TheMathCalculation += "**";
		$("#theCalculation").html($("#theCalculation").html() + "^")
	}
})

// dealing with xx returning ** 
$("#theDif").on("click", function() {
	if ($("#theCalculation").html().length <= 25) {
		$("#theCalculation").html($("#theCalculation").html() + "x")
		if (previousTarget === this ) {
	 		TheMathCalculation += "x"
		} else {
			TheMathCalculation += "*";
		}
		previousTarget = this;	
	}
})


              
            
!
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