tic-tac-toe-cpp/ttt.cc

#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();
}