Connect four game help

hi all i know this might be a simple game for you guys but i need help with it, if anyone is willing to help then i thank u in advance.

ive define this structure:

struct Gamestate
{
char board [] [];
char symbol;
char nextTurn;
};

now i would like to the following function:
void computerMove(Gamestate &);
int checkWinner(Gamestate, &);
bool saveGame (GameState, char []);
bool loadGame (GameState &, char[]);

Code:

#include <iostream>

using namespace std;

const int ROW=7;

const int COL=8;



const char PLAYER1='O';

const char PLAYER2='X';



void drawHeader();

char chooseOption();

void initialiseBoard(char[row][col]);

void drawBoard(char[row][col]);

int playerMove(char[row][col], char, int);



int main()

{

	int move=1;

	bool quit=false, startGame=true;

	char board[row][col], playAgain, option;

	

	drawHeader();

	initialiseBoard(board); 

	option = chooseOption();

	if (option!='c') // quit not selected

	{

		while(!quit) //while game not finished 

		{	

			if(startGame)

			{	 

				initialiseBoard(board);

				startGame=false;

			}	  	  	  

			

			drawBoard(board);

			move=playerMove(board, PLAYER1, 1);

			if (move!=0) // player 1 has not quit current game

			{

				drawBoard(board);

				move=playerMove(board, PLAYER2, 2);

								}	 

			if (move==0) // quit set by any of the players	  	  

			{

				cout << "Do you want to start a new game (y/n)?: ";

				cin >>  playAgain;

				if(playAgain == 'n' || playAgain =='N')

					quit=true;

				else

					startGame=true;

			}	 	 	 

		}

	}

	cout << "\nThanks for playing Connect Four, the game of the clever people!\n";

	   

	return 0;

}



int playerMove(char board[row][col], char symbol, int player)

{

	char input;

	int move;

	bool legalMove=false, positionFound=false;



	do{

		cout << "Player " << player << " move (1-8, 0 to quit): ";

		cin >>  input; //read as char to avoid cin errors

		move = static_cast<int>(input) - 48; // convert to integer

		if(move<0 || move >8)

			cout << "Move not allowed!\n"; 

		else if(move && board[0][move-1]!='.')

			cout << "Sorry no more room in this column...\n";

		else 

			legalMove = true;	 	   	   

	}while(move<0 || move >8 || !legalMove);

	

	if(move!=0)		

	{

		for(int row=ROW-2; row>=0  && !positionFound; row--)

		{

			if(board[row][move-1]=='.')

			{

				board[row][move-1]= symbol;

				positionFound=true;

			}

		}

	} 	  

	return move;

}





void drawBoard(char board[row][col])

{

	for(int row=0; row < ROW; row++)

	{

		for(int col=0; col< COL; col++)

			cout << board[row][col];

			cout << endl;

	}

	return;

}

void initialiseBoard(char board[row][col])

{

	//create bottom line of game board: 12345678

	for(int col=0; col < COL ; col++)

		board[row-1][col] = col + '1';

	//fill the rest of the board with .'s, that is initialise the rest of the 2D array to .'s

	for(int row=0; row < ROW-1; row++)

		for(int col=0; col < COL; col++)

			board[row][col]='.';

	

	return;

}	 	 	 

void drawHeader()

{

	cout <<"***********************************************
**********\n";

	cout <<"*                   Connect Four                        *\n";

	cout <<"***********************************************
**********\n";

	cout <<"Welcome to the Connect Four computer game. You can choose\n";

	cout <<"to play against another player or against the computer\n";

	cout <<" (not implemented in this version)\n";

	cout <<"In this game the first player to position four of his/her\n";

	cout <<"pieces on a line will win. The line can be horizontal, \n";

	cout <<"vertical or at an angle, but the 4 pieces must be next to\n";

	cout <<"each other.\n";

	cout <<"***********************************************
**********\n";

	cout << endl;



	return;

}	 

char chooseOption()

{

	char option;

	do

	{

		cout <<"*************************************\n";

		cout <<"*         Choose an Option          *\n";

		cout <<"*************************************\n";

		cout <<"* a) Play against the computer      *\n";

		cout <<"* b) Play against another player    *\n";

		cout <<"* c) Quit                           *\n";

		cout <<"*************************************\n";

		cout <<"Enter your choice: ";

		

		cin >> option;

		if(option=='a')

			cout << "\nThis option has not yet been implemented\n\n";

	} while (option!='b' && option !='c');

		

	return option;

}

... and the problem is? That's a lot of code to look through. Perhaps you can point us towards a specific problem you're having.

im not too sure how to add these following function into the code:

void computerMove(Gamestate &);
int checkWinner(Gamestate, &);
bool saveGame (GameState, char []);
bool loadGame (GameState &, char[]);



computer move does the random move on the game
int checkWinner checks whos the winner of the game
save game is i would like to save the game every time i make a move or the computer does
and loading the game.