index.html

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Bootstrap demo</title>
  </head>
  <body>
    <h1>Hello, world!</h1>

    <input type="text" placeholder="type a number" onchange="valueChange(event)" />

    <button onclick="displayValue()">Try Me!</button>

    <script src="main.js"></script>
  </body>
</html>
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