"Anirudha Bhowmik calculator"
Bootstrap 4.1.1 Snippet by anirudhabhowmik

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<!DOCTYPE html>
<html>
<head>
<title>javascript calculator</title>
</head>
<body>
<div id="background">
<div id="result"></div>
<div id="main">
<div id="first-rows">
<button id="delete">Del</button>
<button value="%" class="btn-style operator opera-bg">%</button>
<button value="+" class="btn-style opera-bg value operator">+</button>
</div>
<div class="rows">
<button value="7" class="btn-style num first-child">7</button>
<button value="8" class="btn-style num">8</button>
<button value="9" class="btn-style num">9</button>
<button value="-" class="btn-style opera-bg operator">-</button>
</div>
<div class="rows">
<button value="4" class="btn-style num first-child">4</button>
<button value="5" class="btn-style num">5</button>
<button value="6" class="btn-style num">6</button>
<button value="*" class="btn-style opera-bg operator">x</button>
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body {
background:#777;
}
#background {
width:300px;
height:400px;
background:gray;
margin:50px auto;
-webkit-animation:bgChange 1s 1s alternate infinite;
transition: all 1s ease;
}
button {
border:0;
color:#fff;
}
#result {
display:block;
font-family: sans-serif;
width:230px;
height:40px;
margin:10px auto;
text-align: right;
border:0;
background:#3b3535;
color:#fff;
padding-top:10px;
font-size:20px;
margin-left: 25px;
outline: none;
overflow: hidden;
letter-spacing: 4px;
position: relative;
top:10px;
}
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window.onload = function() {
var current,
screen,
output,
limit,
zero,
period,
operator;
screen = document.getElementById("result");
var elem = document.querySelectorAll(".num");
var len = elem.length;
for(var i = 0; i < len; i++ ) {
elem[i].addEventListener("click",function() {
num = this.value;
output = screen.innerHTML +=num;
limit = output.length;
if(limit > 16 ) {
alert("Sorry no more input is allowed");
}
},false);
}
document.querySelector(".zero").addEventListener("click",function() {
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