title: How does number at JavaScript works
body: <p>I have this code in javascript </p>
  
  <pre><code>let a = 1;
  let b = 0.8;
  let c = a-b
  </code></pre>
  
  <p>I expect the value of c to be equal to 0.2, but the value I get is 0.19999999999999996 
  does any one have an explanation</p>