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calculator.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="description" content="Calculator">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="style.css">
<title>Calculator</title>
</head>
<body>
<div id="calculator">
<input id="display" readonly>
<div id="keys">
<button onclick="appendToDisplay('+')" class="op_btn">+</button>
<button onclick="appendToDisplay('7')">7</button>
<button onclick="appendToDisplay('8')">8</button>
<button onclick="appendToDisplay('9')">9</button>
<button onclick="appendToDisplay('-')" class="op_btn">-</button>
<button onclick="appendToDisplay('4')">4</button>
<button onclick="appendToDisplay('5')">5</button>
<button onclick="appendToDisplay('6')">6</button>
<button onclick="appendToDisplay('*')" class="op_btn">*</button>
<button onclick="appendToDisplay('1')">1</button>
<button onclick="appendToDisplay('2')">2</button>
<button onclick="appendToDisplay('3')">3</button>
<button onclick="appendToDisplay('/')" class="op_btn">/</button>
<button onclick="appendToDisplay('0')">0</button>
<button onclick="appendToDisplay('3.1415')">π</button>
<button onclick="calculate()">=</button>
<button onclick="appendToDisplay('**')" class="op_btn">**</button>
<button onclick="appendToDisplay('.')" class="op_btn">.</button>
<button onclick="clearOneDisplay()" class="op_btn">C</button>
<button onclick="clearDisplay()" class="op_btn">CA</button>
</div>
</div>
<script src="script.js"></script>
</body>
</html>