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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Power of 2 divide loop</title>
</head>
<body>
  <h1>Divide-by-2 loop check</h1>
  <p>Edit <code>values</code>, then <strong>Run</strong>.</p>
  <pre id="out"></pre>
  <script>
    (function () {
      function isPowerOfTwo(num) {
        if (num <= 0) {
          return false;
        }
        while (num > 1 && num % 2 === 0) {
          num = Math.floor(num / 2);
        }
        return num === 1;
      }
      var values = [1, 8, 6, 16, 0];
      var lines = [];
      var i;
      for (i = 0; i < values.length; i++) {
        var value = values[i];
        var label = isPowerOfTwo(value) ? "yes" : "no";
        lines.push(value + ": " + label);
      }
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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JavaScript Power of 2 — Divide Loop (Try It)