калькулятор

<!DOCTYPE html>
<html lang="ru">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Калькулятор</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="calculator">
        <input type="text" id="result" disabled>
        <div class="buttons">
            <button onclick="clearResult()">C</button>
            <button onclick="appendToResult('7')">7</button>
            <button onclick="appendToResult('8')">8</button>
            <button onclick="appendToResult('9')">9</button>
            <button onclick="appendToResult('/')">/</button>

Results: