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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>Bootstrap Calculator</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="container mt-5">
        <div class="row justify-content-center">
            <div class="col-md-4">
                <div class="card">
                    <div class="card-header bg-primary text-white text-center">
                        Complex Calculator
                    </div>
                    <div class="card-body">
                        <div class="display bg-dark text-white text-right p-3 mb-3" id="display">0</div>
                        <div class="buttons">
                            <div class="btn-group d-flex mb-2">
                                <button class="btn btn-secondary w-100" onclick="clearDisplay()">C</button>
                                <button class="btn btn-secondary w-100" onclick="deleteLast()">DEL</button>
                                <button class="btn btn-secondary w-100" onclick="appendOperator('%')">%</button>
                                <button class="btn btn-primary w-100" onclick="appendOperator('/')">/</button>
                            </div>
                            <div class="btn-group d-flex mb-2">
                                <button class="btn btn-light w-100" onclick="appendNumber('7')">7</button>
                                <button class="btn btn-light w-100" onclick="appendNumber('8')">8</button>
                                <button class="btn btn-light w-100" onclick="appendNumber('9')">9</button>
                                <button class="btn btn-primary w-100" onclick="appendOperator('*')">*</button>
                            </div>
                            <div class="btn-group d-flex mb-2">
                                <button class="btn btn-light w-100" onclick="appendNumber('4')">4</button>
                                <button class="btn btn-light w-100" onclick="appendNumber('5')">5</button>
                                <button class="btn btn-light w-100" onclick="appendNumber('6')">6</button>
                                <button class="btn btn-primary w-100" onclick="appendOperator('-')">-</button>
                            </div>
                            <div class="btn-group d-flex mb-2">
                                <button class="btn btn-light w-100" onclick="appendNumber('1')">1</button>
                                <button class="btn btn-light w-100" onclick="appendNumber('2')">2</button>
                                <button class="btn btn-light w-100" onclick="appendNumber('3')">3</button>
                                <button class="btn btn-primary w-100" onclick="appendOperator('+')">+</button>
                            </div>
                            <div class="btn-group d-flex mb-2">
                                <button class="btn btn-light w-50" onclick="appendNumber('0')">0</button>
                                <button class="btn btn-light w-50" onclick="appendNumber('.')">.</button>
                            </div>
                            <button class="btn btn-success w-100" onclick="calculateResult()">=</button>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
    <script src="script.js"></script>
    <script src="https://code.jquery.com/jquery-3.5.1.slim.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/@popperjs/[email protected]/dist/umd/popper.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
</body>
</html>