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index.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 app with basic operation</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<h2 style="text-align: center; margin-top:60px; font-size: 40px;">Calculator</h2>
<div class="main">
<table style="text-align: center;">
<tr>
<td colspan="4"><input type="text" id="textbox"></td>
</tr>
<tr>
<td><input type="button" onclick="display('1')" value="1"></td>
<td><input type="button" onclick="display('2')" value="2"></td>
<td><input type="button" onclick="display('3')" value="3"></td>
<td><input type="button" onclick="display('+')" value="+"></td>
</tr>
<tr>
<td><input type="button" onclick="display('4')" value="4"></td>
<td><input type="button" onclick="display('5')" value="5"></td>
<td><input type="button" onclick="display('6')" value="6"></td>
<td><input type="button" onclick="display('-')" value="-"></td>
</tr>
<tr>
<td><input type="button" onclick="display('7')" value="7"></td>
<td><input type="button" onclick="display('8')" value="8"></td>
<td><input type="button" onclick="display('9')" value="9"></td>
<td><input type="button" onclick="display('*')" value="*"></td>
</tr>
<tr>
<td><input type="button" onclick="display('.')" value="."></td>
<td><input type="button" onclick="display('0')" value="0"></td>
<td><input type="button" onclick="calculate()" value="="></td>
<td><input type="button" onclick="display('/')" value="/"></td>
</tr>
<tr>
<td colspan="2"><input type="button" onclick="clr()" value="Clear"></td>
<td colspan="2"><input type="button" onclick="Delete()" value="delete"></td>
</tr>
</table>
</div>
<script src="calc.js"></script>
</body>
</html>