title: Finding if a number is the power of 2 in Scheme
body: <p>I'm fairly new to Scheme and am attempting to learn it on my own from scratch. I'm stuck on the syntax of this problem. I know that if I want to find out if a number is a power of 2, in C for instance, I would simply do:</p>
  
  <pre><code>return (x &amp; (x - 1)) == 0;
  </code></pre>
  
  <p>which would return true or false. How would I be able to convert this into a couple simple lines in Scheme?</p>