title: error; data argument not used by format string
body: <p>I opened iphoneMultichannelmixerTest from Apple developer's site in the new xcode upgrade. Lots of fixes, but I'm stuck with one: </p>
  
  <blockquote>
    <p>data argument not used by format string</p>
  </blockquote>
  
  <p>This is it:</p>
  
  <pre><code>printf("BUS %%disON %lu\n", inputNum, isONValue);
  </code></pre>
  
  <p>I really don't have a clue. Can anybody help me to fix this?
  (Since there appears a tiny little marker under <code>isONValue</code>, I think that might be the problem?!?)</p>