title: to read a double value from file in java
body: <p>My file contains only 18.746786635311242 as a content and nothing else
  when I try to read that double number using code</p>
  
  <pre><code>FileInputStream fin = new FileInputStream("output");
          DataInputStream din = new DataInputStream(fin);
           f = din.readDouble();
          System.out.println(f);
          din.close();
  </code></pre>
  
  <p>and try to print f the value shows 1.3685694889781536E-71</p>