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CALCULATOR.html
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<html>
<head>
<title>
Calculator
</title>
<style>
table{
text-align: center;
}
h1{
text-align: center;
}
input{
font-size: 35px;
}
</style>
<script>
function display(val){
document.getElementById("result").value+=val
}
function solve(){
var x=document.getElementById("result").value
var y= eval(x)
document.getElementById("result").value=y
}
function clear()
{
document.getElementById("result").innerHTML=" " ;
}
</script>
<style>
input{
width: 100%;
height: 100%;
background-color: cyan;
}
</style>
</head>
<body bgcolor="ffeb0e">
<h1><u>CALCULATOR</u></h1><br><br>
<table border=2 align="center" height="65%" width="60%">
<tr>
<td colspan="3" height="25%" ><input type="text" id="result" width="100px" disabled></td>
<td><input type="button" value="c" onclick="clear()"></td>
</tr>
<tr>
<td><input type="button" value="7" onclick="display('7')"></td>
<td><input type="button" value="8" onclick="display('8')"></td>
<td><input type="button" value="9" onclick="display('9')"></td>
<td><input type="button" value="+" onclick="display('+')"></td>
</tr>
<tr>
<td><input type="button" value="4" onclick="display('4')"></td>
<td><input type="button" value="5" onclick="display('5')"></td>
<td><input type="button" value="6" onclick="display('6')"></td>
<td><input type="button" value="-" onclick="display('-')"></td>
</tr>
<tr>
<td><input type="button" value="1" onclick="display('1')"></td>
<td><input type="button" value="2" onclick="display('2')"></td>
<td><input type="button" value="3" onclick="display('3')"></td>
<td><input type="button" value="*" onclick="display('*')"></td>
</tr>
<tr>
<td><input type="button" value="0" onclick="display('0')"></td>
<td><input type="button" value="." onclick="display('.')"></td>
<td><input type="button" value="=" onclick="solve()"></td>
<td><input type="button" value="/" onclick="display('/')"></td>
</tr>
</table>
</body>
</html>