Pre and Post Increment Operator in Java

         In Java we have pre and post increment operator .. Pre increment will increase the value at the start and take the value. Post Increment will take the value and increment it.
For instance,
 if a=5;  a++ and ++ a will be printed as 5 and 6 receptively finally the value of a will be 6 for a.
       Now lets play a game with a logic. If you understand the above mentioned elementary part, then you can win this game easily.
 int a =3;
int k= a++ + a++ + ++a;
Whats the value of k ?
..
..
k=13, try it out.    k= 3 + 4 + 6=13 and a=6.
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