title: strcat() for formatted strings
body: <p>I'm building a string piece by piece in my program and am currently using a mix of strcat() when I'm adding a simple string onto the end, but when im adding a formatted string I'm using sprintf() e.g.:</p>
  
  <pre><code>int one = 1;
  sprintf(instruction + strlen(instruction), " number %d", one);
  </code></pre>
  
  <p>is it possible to concatenate formatted string using strcat() or what is the preferred method for this?</p>