Connect-Four - Zach Daily

/*
 A simple Connect-Four game using a 2-dimensional array - [row][column]
 The player wins by connecting four of their spots in one of four directions
    - Horizontal
    | Veritcal
    / Diagonal
    \ Diagonal

 To be added: AI as an OPTION for player 2

 Date:   2-5-2012
 Author: Zach Daily
 */

#include <iostream>
using namespace std;


//The workings of Connect Four
class connectFour{
    int player;
    int score[2];
    int board[6][7];  //6 = Rows, 7 = Columns
    int move;
    bool win;

public:
    //Set the player number to one and the scores to zero
    connectFour(){
        player = 1;
        score[0] = 0;
        score[1] = 0;
        win = false;

        //Initialize board array
        for (int i = 0; i < 6; i++){
            for (int x = 0; x < 7; x++){
                board[i][x] = 0;
            }
        }
    }

    //Setup the turn by first checking for a win
    //If there is no win, continue by displaying the board
    //and getting the player's move
    void startTurn(){
        checkWin();
        if (win == true){
            clearScreen();
            display();
            cout<< "Player #" << player << " has won!" <<endl <<endl;
        }
        else{
            display();
            gatherMove();
        }
    }

    //Display the board
    void display(){
        clearScreen();
        cout<< " 1  2  3  4  5  6  7 " <<endl;
        for (int i = 0; i < 6; i++){
            for (int x = 0; x < 7; x++){
                cout<< "[" << board[i][x] << "]";
            }
            cout<< endl;
        }
    }

    //Gather the player's move
    void gatherMove(){
        int emptySpots = 0;
        cout<< endl << "Player #" << player << ": Move to which space? ";
        cin>> move;

        //If the player enters anything above 7, set it to 7
        if (move > 7){move = 7;}
        //If the player enters anything below 0, set it to 0
        if (move < 0){move = 0;}

        //Determine where the player's piece falls
        //If something occupies the lowest point already, put it above
        for (int i = 5; i >= 0; i--){
            if (board[i][move - 1] == 0){
                board[i][move - 1] = player;
                break;
            }
            else{
                emptySpots += 1;
            }
        }

        //If there are no more rows in a column, tell the player to try again
        if (emptySpots == 6){
            cout<< endl << "There are no empty spots on #" << move << "! Try again!";
            gatherMove();
        }

        //Set the next player to move
        if (player == 1){player = 2;}
        else {player = 1;}

        //Call start of next turn
        startTurn();
    }

    //Check for any winning combinations
    void checkWin(){
        int start = 0;

        //Horizontal Win
        for (int i = 0; i < 6; i ++){
            for (start = 0; start <= 3; start++){
                if ((board[i][start] == board[i][start+1] && board[i][start+1] == board[i][start+2] && board[i][start+2] == board[i][start+3]) && (board[i][start] != 0)){
                    win = true;
                    player = board[i][start];
                    break;
                }
            }
        }

        //Vertical Win
        for (int i = 0; i < 7; i ++){
            for (start = 0; start <= 2; start++){
                if ((board[start][i] == board[start+1][i] && board[start+1][i] == board[start+2][i] && board[start+2][i] == board[start+3][i]) && (board[start][i] != 0)){
                    win = true;
                    player = board[start][i];
                    break;
                }
            }
        }

        //Diagonal Win - "/"
        for (int i = 3; i < 6; i ++){
            for (start = 0; start <= 3; start++){
                if ((board[i][start] == board[i-1][start+1] && board[i-1][start+1] == board[i-2][start+2] && board[i-2][start+2] == board[i-3][start+3]) && (board[i][start] != 0)){
                    win = true;
                    player = board[i][start];
                    break;
                }
            }
        }

        //Diagonal Win - "\"
        for (int i = 0; i < 3; i ++){
            for (start = 0; start <= 4; start++){
                if ((board[i][start] == board[i+1][start+1] && board[i+1][start+1] == board[i+2][start+2] && board[i+2][start+2] == board[i+3][start+3]) && (board[i][start] != 0)){
                    win = true;
                    player = board[i][start];
                    break;
                }
            }
        }
    }

    //Clear the screen
    //Set for OSX currently - Change the inner system call for Windows or Linux
    void clearScreen(){
        system("clear");
    }

};

//Main function - Nice and small just like I like it!
int main (int argc, char * const argv[]) {
    connectFour play;
    play.startTurn();

    return 0;
}