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cal.html
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<html>
<head>
<title>Calculator</title>
<style>
body{
margin-top:15%;
background:white;
}
*{
box-sizing:border-box;
-webkit-box-sizing:border-box;
-moz-box-sizing:border-box;
}
.wrap{
width:300px;
margin:auto;
height:400px;
background:gray;
border: 3px solid black;
padding:10px;
border-radius: 20px;
}
input[type=text]{
background-color:lightsteelblue;
width:100%;
padding:5px;
font-size:22px;
font-height: bold;
margin-top:20px;
border-radius:5px;
border-color: black;
}
input[type=button]{
background-color: brown;
color: white;
width:63px;
padding:5px;
font-size:22px;
font-height:bold;
border-radius:5px;
border-color: black;
}
#del{
width:48%;
}
input:hover {
background-color:skyblue;
color: black;
}
</style>
</head>
<div class="wrap">
<form name ="cal">
<input type="text" name ="display">
<br><br>
<input type="button" value ="7" onclick ="cal.display.value+='7'">
<input type="button" value ="8" onclick ="cal.display.value+='8'">
<input type="button" value ="9" onclick ="cal.display.value+='9'">
<input type="button" value ="+" onclick ="cal.display.value+='+'">
<br><br>
<input type="button" value ="4" onclick ="cal.display.value+='4'">
<input type="button" value ="5" onclick ="cal.display.value+='5'">
<input type="button" value ="6" onclick ="cal.display.value+='6'">
<input type="button" value ="-" onclick ="cal.display.value+='-'">
<br><br>
<input type="button" value ="1" onclick ="cal.display.value+='1'">
<input type="button" value ="2" onclick ="cal.display.value+='2'">
<input type="button" value ="3" onclick ="cal.display.value+='3'">
<input type="button" value ="*" onclick ="cal.display.value+='*'">
<br><br>
<input type="button" value ="0" onclick ="cal.display.value+='0'">
<input type="button" value ="/" onclick ="cal.display.value+='/'">
<input type="button" value ="%" onclick ="cal.display.value+='%'">
<input type="button" value ="=" onclick ="cal.display.value =eval(cal.display.value)">
<br><br>
<input type="button" value ="DELETE" onclick ="cal.display.value=''" id="del">
<input type="button" value=" √ " onclick="sq()">
<input type="button" value ="." onclick ="cal.display.value+='.'">
</form>
<script>
j
function sq(){
cal.display.value=Math.sqrt(cal.display.value);
}
</script>
<body>
</body>
</html>