Changing the game's internal representation

exercise No. 157

Q:

This exercise aims at changing the subsequent items with respect to the previous Tic-tac-toe solution:

End user perspective

  1. End users are used to count from 1 to 9 rather than from 0 to 8. Consequently we should supply a different hint regarding the fields' numbering scheme: 

    012
345
678
    		 ⇒ 
    123
456
789

  2. The two players should have a choice about who is to start a game: 

    Numbering scheme:

1|2|3
—+—+—
4|5|6
—+—+—
7|8|9


Who is going to start? 0 = June, other = Bill
0


June, please enter next field's number:

  3. The numbering hints should appear “right” to the current tic-tac-toe board rather than on top of it. Furthermore only the remaining free fields shall be on offer. In the next example this restriction excludes position “4”: 

    Player June(O)
vs. Bill(X)          Free fields

 | |                   1|2|3
—+—+—                  —+—+—
O| |                    |5|6
—+—+—                  —+—+—
 | |                   7|8|9

Bill, please enter next field's number:

A:
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