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calculator.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>calculator</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" integrity="sha384-9aIt2nRpC12Uk9gS9baDl411NQApFmC26EwAOH8WgZl5MYYxFfc+NcPb1dKGj7Sk" crossorigin="anonymous">
<style>
#screen-top
{
border: transparent;
text-align: right;
pointer-events: none;
border-radius: 0;
border-top-left-radius: 20px;
border-top-right-radius: 20px;
}
#screen-bottom
{
border: transparent;
text-align: right;
pointer-events: none;
border-radius: 0;
border-bottom-left-radius: 20px;
border-bottom-right-radius: 20px;
}
</style>
<script>
var y=0;
function bttnclick(val)
{
if(val=='+')
{
document.getElementById("screen-top").value+="+";
document.getElementById("screen-bottom").value="";
}
else if(val=='-')
{
document.getElementById("screen-top").value+="-";
document.getElementById("screen-bottom").value="";
}
else if(val=='*')
{
document.getElementById("screen-top").value+="*";
document.getElementById("screen-bottom").value="";
}
else if(val=='/')
{
document.getElementById("screen-top").value+="/";
document.getElementById("screen-bottom").value="";
}
else
{
document.getElementById("screen-bottom").value+=val;
document.getElementById("screen-top").value+=val;
}
}
function clearoff()
{
document.getElementById("screen-top").value="";
document.getElementById("screen-bottom").value="";
}
function back()
{
var value = document.getElementById("screen-bottom").value;
document.getElementById("screen-bottom").value = value.substr(0, value.length - 1);
var value = document.getElementById("screen-top").value;
document.getElementById("screen-top").value = value.substr(0, value.length - 1);
}
function equalclick()
{
var text=document.getElementById("screen-top").value;
var result=eval(text);
document.getElementById("screen-bottom").value=result;
}
function percent()
{
var per = document.getElementById("screen-top").value;
per=eval(per);
per=per/100;
document.getElementById("screen-bottom").value=per;
document.getElementById("screen-top").value=per;
}
function sqr()
{
var squar=document.getElementById("screen-bottom").value;
squar=Math.sqrt(squar);
document.getElementById("screen-bottom").value=squar;
document.getElementById("screen-top").value=squar;
}
</script>
</head>
<body>
<div class="container p-5 bg-dark">
<div class="row">
<div class=" col-12 col-md-4">
<input type="text" id="screen-top" class="form-control">
<input type="text" id="screen-bottom" class="form-control form-control-lg">
<div class="btn-group p-1" style="width: 100%;">
<button type="button" class="btn btn-danger" onclick="clearoff()">C</button>
<button type="button" class="btn btn-primary" onclick="back()">DEL</button>
<button type="button" class="btn btn-primary" onclick="percent()">%</button>
<button type="button" class="btn btn-warning" onclick="sqr()">√</button>
</div>
<div class="btn-group btn-group-justified p-1" style="width: 100%;">
<button type="button" class="btn btn-primary" onclick="bttnclick(7)">7</button>
<button type="button" class="btn btn-primary" onclick="bttnclick(8)">8</button>
<button type="button" class="btn btn-primary" onclick="bttnclick(9)">9</button>
<button type="button" class="btn btn-warning" onclick="bttnclick('/')">/</button>
</div>
<div class="btn-group btn-group-justified p-1" style="width: 100%;">
<button type="button" class="btn btn-primary" onclick="bttnclick(4)">4</button>
<button type="button" class="btn btn-primary" onclick="bttnclick(5)">5</button>
<button type="button" class="btn btn-primary" onclick="bttnclick(6)">6</button>
<button type="button" class="btn btn-warning" onclick="bttnclick('*')">x</button>
</div>
<div class="btn-group btn-group-justified p-1" style="width: 100%;">
<button type="button" class="btn btn-primary" onclick="bttnclick(1)">1</button>
<button type="button" class="btn btn-primary" onclick="bttnclick(2)">2</button>
<button type="button" class="btn btn-primary" onclick="bttnclick(3)">3</button>
<button type="button" class="btn btn-warning" onclick="bttnclick('-')">-</button>
</div>
<div class="btn-group btn-group-justified p-1" style="width: 100%;">
<button type="button" class="btn btn-primary" onclick="bttnclick(0)">0</button>
<button type="button" class="btn btn-primary" onclick="bttnclick('00')">00</button>
<button type="button" class="btn btn-primary" onclick="bttnclick('.')">.<button>
<button type="button" class="btn btn-warning" onclick="bttnclick('+')">+</button>
</div>
<div class="p-1">
<button type="button" class="btn btn-success" style="width:100%" id="lastbutton" onclick="equalclick()">=</button></div>
<p class="address text-white p-1">
Calculator © 2020::
developed by Sarath Raj
</p>
</div>
</div>
</div>
</div>
<!-- JS, Popper.js, and jQuery -->
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js" integrity="sha384-OgVRvuATP1z7JjHLkuOU7Xw704+h835Lr+6QL9UvYjZE3Ipu6Tp75j7Bh/kR0JKI" crossorigin="anonymous"></script>
</body>
</html>