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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" />
<link rel="stylesheet" href="style/style.css" />
<script src="backend/index.js" defer></script>
<title>Calculator</title>
</head>
<body>
<div class="calculator">
<div class="display">
<input type="text" id="display" oninput="validateInput()" />
</div>
<div class="buttons">
<button onclick="updateDisplay('√')">√</button>
<button onclick="updateDisplay('log')">log</button>
<button onclick="updateDisplay('fact')">fact</button>
<button onclick="updateDisplay('.')">.</button>
<button onclick="updateDisplay('sin')">sin</button>
<button onclick="updateDisplay('cos')">cos</button>
<button onclick="updateDisplay('tan')">tan</button>
<button onclick="updateDisplay('**')">^</button>
<button onclick="updateDisplay('%')">%</button>
<button onclick="clearDisplay()">C</button>
<button onclick="backspace()">←</button>
<button onclick="updateDisplay('/')">/</button>
<button onclick="updateDisplay('7')">7</button>
<button onclick="updateDisplay('8')">8</button>
<button onclick="updateDisplay('9')">9</button>
<button onclick="updateDisplay('*')">*</button>
<button onclick="updateDisplay('4')">4</button>
<button onclick="updateDisplay('5')">5</button>
<button onclick="updateDisplay('6')">6</button>
<button onclick="updateDisplay('-')">-</button>
<button onclick="updateDisplay('1')">1</button>
<button onclick="updateDisplay('2')">2</button>
<button onclick="updateDisplay('3')">3</button>
<button onclick="updateDisplay('+')">+</button>
<button onclick="updateDisplay('0')" class="zero">0</button>
<button onclick="calculate()">=</button>
</div>
</div>
</body>
</html>