picking a random char from an array : <p>I was wondering if there is a way of randomly picking a character from the following array in C but only picking each character once....</p>

<pre><code>const char characters[13][4] =
                    {   'A' , 'B' , 'C' , 'D' , 'E' , 'F' , 'G' , 'H' , 'I' ,
                        'J' , 'K' , 'L' ,'M' , 'N' , 'O' , 'P' , 'Q' , 'R' ,
                        'S' , 'T' , 'U' , 'V' , 'W' , 'X' , 'Y', 'Z', 

                        'A' , 'B' , 'C' , 'D' , 'E' , 'F' , 'G' , 'H' , 'I' ,
                        'J' , 'K' , 'L' , 'M'  , 'N' ,'O' , 'P' , 'Q' , 'R' ,
                        'S' , 'T' , 'U' , 'V' , 'W' , 'X' , 'Y', 'Z'

                    };
</code></pre>
