write a code for simple calculator in html 5

Sure, here’s a simple calculator implemented using HTML5:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Simple Calculator</title>
    <style>
        body {
            font-family: Arial, sans-serif;
        }
        .calculator {
            width: 200px;
            margin: 0 auto;
            padding: 20px;
            border: 1px solid #ccc;
            border-radius: 5px;
            background-color: #f9f9f9;
        }
        input[type="text"] {
            width: 100%;
            margin-bottom: 10px;
            padding: 5px;
            font-size: 18px;
        }
        input[type="button"] {
            width: 48%;
            padding: 10px;
            margin: 5px;
            font-size: 16px;
            border: none;
            cursor: pointer;
            background-color: #007bff;
            color: #fff;
            border-radius: 5px;
        }
        input[type="button"]:hover {
            background-color: #0056b3;
        }
    </style>
</head>
<body>
    <div class="calculator">
        <input type="text" id="display" readonly>
        <div>
            <input type="button" value="7" onclick="addToDisplay('7')">
            <input type="button" value="8" onclick="addToDisplay('8')">
            <input type="button" value="9" onclick="addToDisplay('9')">
            <input type="button" value="+" onclick="addToDisplay('+')">
        </div>
        <div>
            <input type="button" value="4" onclick="addToDisplay('4')">
            <input type="button" value="5" onclick="addToDisplay('5')">
            <input type="button" value="6" onclick="addToDisplay('6')">
            <input type="button" value="-" onclick="addToDisplay('-')">
        </div>
        <div>
            <input type="button" value="1" onclick="addToDisplay('1')">
            <input type="button" value="2" onclick="addToDisplay('2')">
            <input type="button" value="3" onclick="addToDisplay('3')">
            <input type="button" value="*" onclick="addToDisplay('*')">
        </div>
        <div>
            <input type="button" value="0" onclick="addToDisplay('0')">
            <input type="button" value="." onclick="addToDisplay('.')">
            <input type="button" value="=" onclick="calculate()">
            <input type="button" value="/" onclick="addToDisplay('/')">
        </div>
        <div>
            <input type="button" value="C" onclick="clearDisplay()">
        </div>
    </div>

    <script>
        function addToDisplay(value) {
            document.getElementById("display").value += value;
        }

        function calculate() {
            try {
                document.getElementById("display").value = eval(document.getElementById("display").value);
            } catch (error) {
                document.getElementById("display").value = 'Error';
            }
        }

        function clearDisplay() {
            document.getElementById("display").value = '';
        }
    </script>
</body>
</html>

This HTML code creates a simple calculator with buttons for numbers (0-9), arithmetic operations (+, -, *, /), decimal point (.), equals (=), and clear (C). The JavaScript functions addToDisplay, calculate, and clearDisplay handle the calculator’s functionality.

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