because nobody wins at tictactoe when properly played i think this is the shortest code
echo 0;
7 chars
Update: A better entry for bash would be this:
86 characters or 81 excluding function definition(win()).
win()for q in 1 28 55 3 12 21 4 20;{ [[ 3*w -eq B[f=q/8]+B[g=q%8]+B[g+g-f] ]]&&break;}
But, This is code from by tic-tac-toe program in bash so it does not quite meet specification.
# player is passed in caller's w variable. I use O=0 and X=2 and empty=8 or 9
# if a winner is found, last result is true (and loop halts) else false
# since biggest test position is 7 I'll use base 8. could use 9 as well but 10 adds 2 characters to code length
# test cases are integers made from first 2 positions of each row
# eg. first row (0 1 2) is 0*8+1 = 1
# eg. diagonal (2 4 6) is 2*8+4 = 20
# to convert test cases to board positions use X/8, X%8, and X%8+(X%8-X/8)
# for each test case, test that sum of each tuplet is 3*player value
