title: bc is ignoring scale option
body: <p>I can't figure out why bc tool sometimes ignores the scale option.</p>
  
  <p>Here is an example:</p>
  
  <pre><code>&gt; echo 'scale=2; 2.777 - 1.4744' | bc
  1.3026
  </code></pre>
  
  <p>Expected result is:</p>
  
  <pre><code>1.30
  </code></pre>
  
  <p>Additional information:</p>
  
  <pre><code>&gt; bash --version
  GNU bash, version 2.05b.0(1)-release (x86_64-suse-linux)
  Copyright (C) 2002 Free Software Foundation, Inc.
  &gt; bc --version
  bc 1.06
  Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.
  </code></pre>