title: why drand48 () show same value in each run in my program?
body: <p>I try to create a variable to get value random with  <strong><em>drand48 ()</em></strong> but in each run my variable take a same value . 
  can anybody help me , (i want in each run my variable take different value) ???</p>
  
  <pre><code>let number = drand48 ()
  </code></pre>