title: How to print 2d-array with comma and new line
body: <pre><code>int **arr;  //For example: 4 by 3 array
  </code></pre>
  
  <p>How can I print 2d-array with comma and new line like below?</p>
  
  <pre><code>01, 02, 03, 04  // At last, new line without comma
  05, 06, 07, 08 
  09, 10, 11, 12
  </code></pre>
  
  <p>I need the fastest method to print like it.</p>