init and work on implementation

.vscode/settings.json

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+{
+  "files.associations": {
+    "iostream": "cpp"
+  }
+}

ttt.cc

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+#include <iostream>
+#include <string>
+
+using namespace std;
+
+
+const int ROWS = 3;
+const int COLUMNS = 3;
+
+/* Grid representing the tic-tac-toe field.
+   0  is empty,
+   1  is human,
+   -1 is computer.
+*/
+int grid[COLUMNS][ROWS];
+
+void printGrid() {
+  for (int y = 0; y < ROWS; y++) {
+    for (int x = 0; x < 2 * COLUMNS + 1; x++) {
+      cout << '-';
+    }
+    cout << endl;
+    for (int x = 0; x < COLUMNS; x++) {
+      if (x == 0) {
+        cout << '|';
+      }
+      if (grid[x][y] > 0) {
+        cout << 'X';
+      } else if (grid [x][y] < 0) {
+        cout << 'O';
+      } else {
+        cout << ' ';
+      }
+      cout << '|';
+    }
+    cout << endl;
+    if (y == COLUMNS - 1) {
+      for (int x = 0; x < 2 * COLUMNS + 1; x++) {
+        cout << '-';
+      }
+      cout << endl;
+    }
+  }
+}
+
+
+bool parse_move(string move, int &x, int &y) {
+  // split string on comma
+  string x_str;
+  string y_str;
+  int pos = move.find(',');
+
+  // error if no comma found
+  if (pos == string::npos) {
+    return false;
+  }
+
+  // split on ','
+  x_str = move.substr(0, pos);
+  y_str = move.substr(pos + 1, move.length() - 1 - pos);
+
+  // convert to int
+  int x_local = stoi(x_str);
+  int y_local = stoi(y_str);
+
+  // check conversion and return expected result
+  if (x_local != -1 && y_local != -1) {
+    x = x_local;
+    y = y_local;
+    return true;
+  }
+
+  return false;
+}
+
+void player_move() {
+  string move;
+  int x;
+  int y;
+  while (true) {
+    cout << "Enter a valid move. (Format is 'x,y')" << endl;
+    cin >> move;
+    if (!parse_move(move, x, y)) {
+      cout << "Couldn't parse move." << endl;
+      continue;
+    }
+    if (x < 0 || y < 0 || x >= COLUMNS || y >= ROWS) {
+      cout << "Coordinates out of bounds." << endl;
+      continue;
+    }
+    break;
+  }
+  grid[x][y] = '1';
+}
+
+void computer_move() {
+}
+
+bool game_over() {
+  return false;
+}
+
+/* Play one game of tic tac toe, 
+/* returns 0 if the player won and 1 if the computer won. 
+*/
+int play_game() {
+  // Query for starting player
+  int startPlayer = -1;
+  while (startPlayer != 0 && startPlayer != 1) {
+    cout << "Which player should start? (0 - You, 1 - Program)";
+    cin >> startPlayer;
+  }
+
+  // Do move according to startPlayer
+  if (startPlayer == 1) {
+    computer_move();
+  }
+
+  while(true) {
+    player_move();
+    if (game_over()) break;
+    computer_move();
+    if (game_over()) break;
+  }
+
+
+  return 0;
+}
+
+int main(int argc, char *argv[]) {
+  cout << "Hello world" << endl;
+  for (int y = 0; y < ROWS; y++) {
+    for (int x = 0; x < COLUMNS; x++) {
+      grid[x][y] = 1;
+    }
+  }
+  printGrid();
+  player_move();
+}