Check win with "if statements"

6 views (last 30 days)
Nathan Ross
Nathan Ross on 17 Apr 2021
Edited: Image Analyst on 18 Apr 2021
I have been working on different methods to check for a winner in my game of tic tac toe. My current approach is using "if" statements. My problem is I am not sure how to properly define my values to exectute my "winner" dialogue . Could I get some help on this? My code is below and What I am attempting to add is commented towards the bottom right before the three "ends".
%start of game file
TTCboard = zeros(3,3);% creates a 3x3 matrix of zeros
% for creating the standard tic-tac-toe board in blue and red
figure
plot([0 3],[-1 -1], 'b','linewidth',1);% creates top horizontal line in board
hold on
plot([2 2],[0 -3], 'b','linewidth',1)% creates right-most vertical line
plot([3 3],[0 -3], 'r','linewidth',2)% boxes in right-most lines
plot([0 3],[-3 -3], 'r','linewidth',2)% boxes in the bottom-most lines
plot([0 3],[0 0], 'r','linewidth',2)% boxes in top -most lines
plot([0 3],[-2 -2], 'b','linewidth',1)% creates bottom horizontal line
plot([0 0],[0 -3], 'r','linewidth',2 ...
)% boxes in left-most lines
plot([1 1],[0 -3], 'b','linewidth',1)% creates left-most vertical line
title('welcome to tic-tac-toe! Good Luck!');% creates title above the game
axis off % keeps the X & y-axis off, creating a better looking natural board
hold off% ensures later commands are added to existing board
xticks([0 1 2 3]); yticks([0 1 2 3]);
xticklabels([]); yticklabels([]);
player = 'X'; % designates the first player as X
while true % when it is player x's turn, the following holds true
fprintf('%s click to place an X\n', player); % creates X in the cell clicked on
[x, y] = ginput(1);
x = floor(x)+0.5 ;
y = floor(y)+0.5;
while TTCboard(x+0.5,-(y-0.5)) ~= 0
disp('Please pick an open square')% when more than one X or O attempts to be entered in the same space, the message will appear in command window prompting the player to try again
[x, y] = ginput(1);
x = floor(x)+0.5;
y = floor(y)+0.5;
end
text(x,y,player, 'horizontalalignment', 'center', 'FontSize',24);% gives specific parameters to the X on the board and centers it in the clicked on cell
TTCboard(x+0.5,-(y-0.5)) = 1;
xticks([0 1 2 3]); yticks([0 1 2 3]);
xticklabels([]); yticklabels([]);
player2 = 'O'; % Designates the 2nd players turn after player 1
while true %for when it is player 2's turn, the following holds true
fprintf('%s click to place an O \n', player2);% instructs the player to put down their O in one of the available cells
[x, y] = ginput(1);
x = floor(x)+0.5;
y = floor(y)+0.5;
while TTCboard(x+0.5,-(y-0.5)) ~= 0
disp('Please pick an open square')% when more than one X or O attempts to be entered in the same space, the message will appear in command window.
[x, y] = ginput(1);
x = floor(x)+0.5;
y = floor(y)+0.5;
end
text(x,y,player2, 'horizontalalignment', 'center', 'FontSize',24);% specifies the style and size of the O used in the game and centers it
TTCboard(x+0.5,-(y-0.5)) = 2;% assigns a value to the O cell
% if (1,1)=(1,2)==(1,3);
% waitfor(warndlg('player wins'));
% close all
end
end
end
%end of game file
% Thank you for playing
  1 Comment
Nathan Ross
Nathan Ross on 17 Apr 2021
Sidenote. There should be a break; before the commented code

Sign in to comment.

Answers (1)

Image Analyst
Image Analyst on 17 Apr 2021
Try this:
% Let's get 10 random boards and check to see which player won, if anyone.
for k = 1 : 10
% Get sample board.
TTCboard = randi([0, 1], 3, 3)
% See if 1 (X) won this board.
winnerIs1 = any(sum(TTCboard, 1) == 3) || ...
any(sum(TTCboard, 2) == 3) || ...
(TTCboard(1,1) == 1 && TTCboard(2,2) == 1 && TTCboard(3,3) == 1) || ...
(TTCboard(1,3) == 1 && TTCboard(2,2) == 1 && TTCboard(3,1) == 1);
if winnerIs1
fprintf('1 X won this board.\n\n');
end
% See if 0 (O) won this board.
winnerIs0 = any(sum(TTCboard, 1) == 0) || ...
any(sum(TTCboard, 2) == 0) || ...
(TTCboard(1,1) == 0 && TTCboard(2,2) == 0 && TTCboard(3,3) == 0) || ...
(TTCboard(1,3) == 0 && TTCboard(2,2) == 0 && TTCboard(3,1) == 0);
if winnerIs0
fprintf('O won this board.\n\n');
end
% If it was a draw, print that out.
if ~(winnerIs0 || winnerIs1)
fprintf('No one won this board -- it was a draw.\n\n');
end
end
  4 Comments
Nathan Ross
Nathan Ross on 17 Apr 2021
After working on it more and taking your suggestions I have made some more progress. My issue now is that I get an "x wins " message upon placing the third X even when there isnt a line of them for some reason.
This is what I have done.
TTCboard = zeros(3,3);% creates a 3x3 matrix of zeros
% for creating the standard tic-tac-toe board in blue and red
figure
plot([0 3],[-1 -1], 'b','linewidth',1);% creates top horizontal line in board
hold on
plot([2 2],[0 -3], 'b','linewidth',1)% creates right-most vertical line
plot([3 3],[0 -3], 'r','linewidth',2)% boxes in right-most lines
plot([0 3],[-3 -3], 'r','linewidth',2)% boxes in the bottom-most lines
plot([0 3],[0 0], 'r','linewidth',2)% boxes in top -most lines
plot([0 3],[-2 -2], 'b','linewidth',1)% creates bottom horizontal line
plot([0 0],[0 -3], 'r','linewidth',2 ...
)% boxes in left-most lines
plot([1 1],[0 -3], 'b','linewidth',1)% creates left-most vertical line
title('welcome to tic-tac-toe! Good Luck!');% creates title above the game
axis off % keeps the X & y-axis off, creating a better looking natural board
hold on% ensures later commands are added to existing board
xticks([0 1 2 3]); yticks([0 1 2 3]);
xticklabels([]); yticklabels([]);
player = 'X'; % designates the first player as X
while true % when it is player x's turn, the following holds true
fprintf('%s click to place an X\n', player); % creates X in the cell clicked on
[x, y] = ginput(1);
x = floor(x)+0.5 ;
y = floor(y)+0.5;
while TTCboard(x+0.5,-(y-0.5)) ~= 0
disp('Please pick an open square')% when more than one X or O attempts to be entered in the same space, the message will appear in command window prompting the player to try again
[x, y] = ginput(1);
x = floor(x)+0.5;
y = floor(y)+0.5;
end
TTCboard(x+0.5,-(y-0.5)) = 1;
winnerIs1 = any(sum(TTCboard, 1) == 3) || ...% for checking if X wins
any(sum(TTCboard, 2) == 3) || ...%checks for sum in 2nd row
(TTCboard(1,1) == 1 && TTCboard(2,2) == 1 && TTCboard(3,3) == 1) || ... % one winning combination
(TTCboard(1,1) == 1 && TTCboard(2,1) == 1 && TTCboard(3,1) == 1) || ... % one winning combination
(TTCboard(1,3) == 1 && TTCboard(2,2) == 1 && TTCboard(3,1) == 1);% one winning combination
(TTCboard(1,1) == 1 && TTCboard(1,2) == 1 && TTCboard(1,3) == 1);% one winning combination
(TTCboard(1,3) == 1 && TTCboard(1,2) == 1 && TTCboard(1,1) == 1);% one winning combination
(TTCboard(3,1) == 1 && TTCboard(3,2) == 1 && TTCboard(3,3) == 1);% one winning combination
text(x,y,player, 'horizontalalignment', 'center', 'FontSize',24);% gives specific parameters to the X on the board and centers it in the clicked on cell
if winnerIs1
waitfor(warndlg(' X wins')); % displays that x wins
close all;
end
xticks([0 1 2 3]); yticks([0 1 2 3]);
xticklabels([]); yticklabels([]);
player2 = 'O'; % Designates the 2nd players turn after player 1
while true %for when it is player 2's turn, the following holds true
fprintf('%s click to place an O \n', player2);% instructs the player to put down their O in one of the available cells
[x, y] = ginput(1);
x = floor(x)+0.5;
y = floor(y)+0.5;
while TTCboard(x+0.5,-(y-0.5)) ~= 0
disp('Please pick an open square')% when more than one X or O attempts to be entered in the same space, the message will appear in command window.
[x, y] = ginput(1);
x = floor(x)+0.5;
y = floor(y)+0.5;
end
winnerIso= any(sum(TTCboard, 1) == 0) || ...% checks for o winner
any(sum(TTCboard, 2) == 0) || ...
(TTCboard(1,1) == 0 && TTCboard(2,2) == 0 && TTCboard(3,3) == 0) || ... % possible win
(TTCboard(1,3) == 0 && TTCboard(2,2) == 0 && TTCboard(3,1) == 0);% possible win
text(x,y,player2, 'horizontalalignment', 'center', 'FontSize',24);% specifies the style and size of the O used in the game and centers it
if winnerIso
fprintf('O won this board.\n\n');
end
TTCboard(x+0.5,-(y-0.5)) = 1;% assigns a value to the O cell
break;
if ~(winnerIs0 || winnerIs1)
waitfor(warndlg('Its a draw!'));% displays draw message
close all
end
end
end
Do you see where/why that error could be happening?
I appreciate your help very much.
Image Analyst
Image Analyst on 18 Apr 2021
Edited: Image Analyst on 18 Apr 2021
What is the pattern that gave a false indication of a win? And why did you add in all those extra conditions for a win that were unneeded because they were handled by the "any" condition?

Sign in to comment.

Categories

Find more on Environment and Settings in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!