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Task/Tic-tac-toe/Phix/tic-tac-toe.phix

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+sequence board = repeat(' ',9)  -- {' '/'X'/'O'}
+
+constant wins = {{1,2,3},{4,5,6},{7,8,9},{1,4,7},{2,5,8},{3,6,9},{1,5,9},{3,5,7}}
+
+function check_winner()
+    for w=1 to length(wins) do
+        integer {i,j,k} = wins[w],
+                boardi = board[i]
+        if boardi!=' ' and boardi=board[j] and boardi=board[k] then
+            return boardi
+        end if
+    end for
+    return 0
+end function
+
+procedure showboard()
+    printf(1," %c | %c | %c\n---+---+---\n %c | %c | %c\n---+---+---\n %c | %c | %c\n",board)
+end procedure
+
+integer best_i
+function test_move(integer val, integer depth)
+integer score = check_winner()
+integer best = -1, changed = 0
+    if score!=0 then return iff(score=val?1:-1) end if
+    for i=1 to 9 do
+        if board[i]=' ' then
+            {changed,board[i]} @= val
+            score = -test_move('O'+'X'-val, depth + 1)
+            board[i] = ' '
+            if score>best then
+                if depth=0 then
+                    best_i = i;
+                end if
+                best = score;
+            end if
+        end if
+    end for
+    return iff(changed!=0?best:0)
+end function
+
+integer user = 1
+
+function game()
+integer key, k, win
+    board = repeat(' ',9)
+
+    printf(1,"Board postions are numbered so:\n1 2 3\n4 5 6\n7 8 9\n");
+    printf(1,"You have O, I have X.\n\n");
+    for n=1 to 9 do
+        if(user) then
+            printf(1,"your move: ");
+            while 1 do
+                key = wait_key()
+                if find(key,{#1B,'q','Q'}) then return "Quit" end if
+                k = key-'0'
+                if k>=1 and k<=9 and board[k]=' ' then
+                    board[k] = 'O'
+                    printf(1,"%c\n",key)
+                    exit
+                end if
+            end while
+        else
+            if n=1 then --/* randomize if computer opens, less boring */
+                best_i = rand(9)
+            else
+                {} = test_move('X', 0);
+            end if
+            board[best_i] = 'X'
+            printf(1," my move: %d\n", best_i);
+        end if
+        showboard();
+        user = 1-user
+        win = check_winner()
+        if win!=0 then
+            return iff(win=='O' ? "You win.\n\n" : "I win.\n\n");
+        end if
+    end for
+    return "A draw.\n\n";
+end function
+
+while 1 do
+    string res = game()
+    puts(1,res)
+    if res="Quit" then exit end if
+end while