#include <stdio.h>

#define NROWS 6
#define NCOLS 7

// right now this just prints out the characters in the array,
// but you could also decorate them with additional characters
// to make a grid like this:
//
// +---+---+---+---+
// | X | O |   |   |
// +---+---+---+---+
//
// etc.

void print_board(char board[NROWS][NCOLS]) {

  int i, j;

  for (i=0; i<NROWS; ++i) {
    for (j=0; j<NCOLS; ++j) {
      printf("%c", board[i][j]);
    }
    printf("\n");
  }


}


// use space for empty cells
// use X for red
// use O for black
void init_board(char board[NROWS][NCOLS]) {

  int i, j;

  for (i=0; i<NROWS; ++i) {
    for (j=0; j<NCOLS; ++j) {
      board[i][j] = '_';
    }
  }

}

// write this function to see if either player has connected 4
// so player gets passed in as X or O and the function returns
// 1 if there is a connect 4.
int has_won(char board[NROWS][NCOLS], char player) {
  return 0; // no winner
}

// write this function to find out what row the piece lands
// in, or return -1 if the move is illegal.  if the column
// is empty, you should return the largest row (NROWS-1)
int row_for_column(char board[NROWS][NCOLS], int col) {
}

int main() {

  // this defines the board to be a NROWSxNCOLS matrix of characters
  char board[NROWS][NCOLS];

  init_board(board);

  board[5][3] = 'X';
  board[5][4] = 'O';

  print_board(board);

  // get the number of players (2 players or human vs computer)
  // initialize the board
  // loop until the game is done
  //   - get the desired move or choose for the computer
  //   - detect what row the piece goes in
  //   - update the board
  //   - check to see if the game is over

  return 0;

}