title: Print information in "test mode" but not in "normal execution"
body: <p>I am using an application in c++ that uses a special dprintf function to print information, this is an example:</p>
  
  <pre><code>dprintf(verbose, "The value is: %d", i);
  </code></pre>
  
  <p>What is doing is when I define verbose for test purposes then I print the information and when I am working in normal execution I do not define it and I do not see useless information in the screen. My question is how can I do that function or implement the same idea?.</p>