title: What are the differences between 'Other C Flags' and 'Preprocessor Macros' in Xcode
body: <p>It can be found in Build Settings.</p>
  
  <p>For example, what are the differences below:</p>
  
  <p>define -DDEBUG in Other c flags</p>
  
  <p>and</p>
  
  <p>define -DDEBUG in Preprocessor Marcos</p>
  
  <p>thanks</p>