Is this psuedocode implementation correct? (TicTacToe)

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Matt Amador on 2 Nov 2017

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https://in.mathworks.com/matlabcentral/answers/364800-is-this-psuedocode-implementation-correct-tictactoe

Closed: Walter Roberson on 3 Nov 2017

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Hello there. I've been at this particular psuedocode set that is made for a tic-tac-toe game for quite sometime, and the MATLAB implementation indicates something wrong in this, but even with the explanation it gives, I still can't seem to figure that's wrong with it. Can anyone help out?

clc
clear
G = [0 0 0; 0 0 0; 0 0 0];
turn = 1;
rand(5)
if rand < 0.5
    turn = -1;
end
gameOn = true;
plotTicTacToe(G)
while gameOn == true
    if turn < 0
        [r,c] = getMove(G,-1);
    if r == 0 || c == 0
        r = [0,G];
        c = [0,G];
    end
    G(r,c) = -1;
    turn = 1;
    else
        r = input('Give r');
        c = input('Give c');
        if G(r,c) ~= 0
            continue
        else
            G(r,c) =  1;
            turn = -1;
        end
    end
      plotTicTacToe(G)
      p = getWinner(G);
      if p == 1
          disp('You won!')
          gameOn = false;
      elseif p == -1
          disp('Computer won!')
          gameOn = false;
      elseif p == 2
          disp('Draw!')
          gameOn = false;
      end
  end

Here is the rest of the code (functions) needed:

getWinner.m:

function[p1] = getWinner(p)
if p == -1
    disp('Computer Wins!')
elseif p == 1
    disp('You won!')
elseif p == 2
    disp('Draw!')
elseif p == 0
    disp('No winner yet.')
end
p1 = p;

getMove.m:

function[G, p] = getMove(r,c)
G = [0 0 0; 0 0 0; 0 0 0];
p = G;
s = 2 * p;
sumG = sum(G);
if sum(G) == s
    c = find(sumG == s);
    r = find(G(c) == 0);
elseif sum(G,3) == s
    c = find(sumG(1,2,3) == s);
    r = find(G(r,:) == 0);
elseif sum(diag(G)) == s
    r = find(diagG(fliplr) == 0);
    c = 4 - r;
else
    r = 0;
    c = 0;
end

plotTicTacToe.m:

function  plotTicTacToe(G)
% plotTicTacToe(G) plot the Tic-tac-toe matrix on the command window
    clc
    fprintf('  \n');
    fprintf('     |   |\n');
    fprintf('   %s | %s | %s \n', getSymb(G(1)), ...
                                  getSymb(G(4)), ...
                                  getSymb(G(7)));
    fprintf('  ---+---+---\n');
    fprintf('   %s | %s | %s \n', getSymb(G(2)), ...
                                  getSymb(G(5)), ...
                                  getSymb(G(8)));
    fprintf('  ---+---+---\n');
    fprintf('   %s | %s | %s \n', getSymb(G(3)), ...
                                  getSymb(G(6)), ...
                                  getSymb(G(9)));
    fprintf('     |   |\n');
    fprintf('  \n');
end

Also getSymb.m (To get X,O,):

function[s] = getSymb(s)
disp('-1 = X, 1 = O, 0 = Empty Space');
p = input('Give me your mark: ');
if p == -1
    s = 'X';
elseif p == 1
    s = 'O';
elseif p == 0
    s = ' ';
end
str = s;