title: 1e-9 or -1e9, which one is correct?
body: <p>I am assigned some old code and when I was reading through it, I noticed it had these in the form of:</p>
  
  <pre><code>float low = 1e-9;
  float high = 1e9;
  
  float lowB = 1e-9;
  float highB = 1e9;
  
  float lowL = 1e-9;
  float highL = 1e9;
  </code></pre>
  
  <p>So I see that it's trying to define some ranges using the e notation, right? But isn't <code>1e-9</code> supposed to be <code>-1e9</code>?</p>
  
  <p>Then the values would be between <code>-1000000000</code> and <code>1000000000</code>, right?</p>
  
  <p>I am not sure what <code>1e-9</code> is meant for?</p>