Would like some assistance please

This is my final project for engineering C++. The rules are: Allow for multiple games, must use a 2-D array, must use at least 3 functions, 2 player, prompt user to enter a row number and column number of chosen cell, test for a winner and a draw, output the grid as it currently stands, guard against cheaters (don't let a player choose a cell that has already been used), guard against exceeding the bounds of the array...

This what I have written thus far. I'm having trouble trying to figure out the best way to guard against cheaters and exceeding the bounds of the array. Any help would be greatly appreciated.

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#include <iostream>
#include <string>
#include <time.h>
#include <conio.h>
using namespace std;

int MAX=4;

char playerInput (char piece, char player1piece, char player2piece, string player1, 
				  string player2, char win, int &player, char input[4][4], int limit);
void board (char input[4][4], int limit);
char test (char win, char input[4][4], int limit);

unsigned char upright=191;
unsigned char botleft=192;
unsigned char botup=193;
unsigned char topdown=194;
unsigned char leftright=195;
unsigned char horiz=196;
unsigned char cross=197;
unsigned char vert=179;
unsigned char rightleft=180;
unsigned char botright=217;
unsigned char upleft=218;
unsigned char beep=7;
unsigned char X=1;
unsigned char s=' ';

int main()
{
	char input[4][4], win='n', player1piece, player2piece, piece;
	int player=1, x, y, limit=MAX;
	string player1, player2;
	char repeat='y';
	cout <<"Final: Tic Tac Toe by Brandy McCoy\n\n";
	cout <<"Player 1, please enter your name:  ";
	cin >>player1;
	cout <<"\nPlayer 2, please enter your name:  ";
	cin >>player2;
	while (repeat=='y' || repeat=='Y')
	{
		x=1;
		while (x<=3)
		{
			y=1;
			while (y<=3)
			{
				input[x][y]=' ';
				y++;
			}
			x++;
		}
		player1piece='X';
		player2piece='O';
		system ("cls");
		player=1;
		do
		{
			board (input, limit);
			if (player==1 && win=='n')
			{
				piece=player1piece;
				win= playerInput(player1piece, player2piece, piece, 
									 player1, player2, win, player, 
									 input, limit);
				player=2;
			}
			board (input, limit);
			if (player==2 && win=='n')
			{
				piece=player2piece;
				win= playerInput(piece, player1piece, player2piece,
									 player1, player2, win, 
									 player, input, limit);
				player=1;
			}
			board (input, limit);
			system ("cls");
		}
		while (win=='n' || win=='N');
		board (input, limit);
		if (win=='d')
		{
			cout <<"The game is a draw.\n";
		}
		else if (win=='y')
		{
			if (player==2)
			{
				cout <<player1<<" wins!";
			}
			else if (player==1)
			{
				cout <<player2<<" wins!";
			}
		}
	cout <<"Would you like to play again?\n";
	cin >>repeat;
	win='n';
	}
return 0;
}
char playerInput (char piece, char player1piece, char player2piece, string player1,
				  string player2, char win, int &player, char input[4][4], int limit)
{
	int row, col;
	string name;
	if (player==1)
	{
		name=player1;
	}
	else
	{
		name=player2;
	}
	cout <<name<<", please pick a row to put your "<<piece<<" in or 0 to quit:  ";
	cin >>row;
	if (row==0)
	{
		player=1;
		return win='O';
	}
	cout <<name<<", please pick a column to put your "<<piece<<" in:  ";
	cin >>col;
	system ("cls");
	if (input[row][col]==' ')
	{
		input[row][col]=piece;
		board (input, limit);
		win=test(win, input, limit);
	}
	else
	{
		cout<<"Please try again!";
	}
	return win;
}
void board(char input[4][4], int limit)
{
	system ("cls");
	cout <<"Final: Tic Tac Toe by Brandy McCoy\n";
	cout <<"Player 1, you are X's.\n";
	cout <<"Player 2, you are O's.\n\n";
	cout <<"   "<<s<<" "<<s<<s<<s<<" "<<s<<s<<s<<" "<<s<<endl<<endl;
	cout <<"   "<<s<<s<<s<<vert<<s<<s<<s<<vert<<s<<s<<s<<endl;
	cout <<"   "<<s<<input[1][1]<<s<<vert<<s<<input[2][1]<<s<<vert
		 <<s<<input[3][1]<<s<<endl;
	cout <<"   "<<s<<s<<s<<vert<<s<<s<<s<<vert<<s<<s<<s<<endl;
	cout <<"   "<<horiz<<horiz<<horiz<<cross<<horiz<<horiz<<horiz
		 <<cross<<horiz<<horiz<<horiz<<endl;
	cout <<"   "<<s<<s<<s<<vert<<s<<s<<s<<vert<<s<<s<<s<<endl;
	cout <<"   "<<s<<input[1][2]<<s<<vert<<s<<input[2][2]<<s<<vert
		 <<s<<input[3][2]<<s<<endl;
	cout <<"   "<<s<<s<<s<<vert<<s<<s<<s<<vert<<s<<s<<s<<endl;
	cout <<"   "<<horiz<<horiz<<horiz<<cross<<horiz<<horiz<<horiz
		 <<cross<<horiz<<horiz<<horiz<<endl;
	cout <<"   "<<s<<s<<s<<vert<<s<<s<<s<<vert<<s<<s<<s<<endl;
	cout <<"   "<<s<<input[1][3]<<s<<vert<<s<<input[2][3]<<s<<vert
		 <<s<<input[3][3]<<s<<endl;
	cout <<"   "<<s<<s<<s<<vert<<s<<s<<s<<vert<<s<<s<<s<<endl<<endl;
	return ;
}
char test(char win, char input[4][4], int limit)
{
	int i=1, j=1;
	if (input[1][1]!=' ')
	{
		if (input[1][1]==input[2][1])
		{
			if (input[1][1]==input[3][1])
				return win='y';
		}
		if (input[1][1]==input[1][2])
		{
			if (input[1][1]==input[1][3])
				return win='y';
		}
		if(input[1][1]==input[2][2])
		{
			if (input[1][1]==input[3][3])
				return win='y';
		}
	}
	if (input[2][2]!=' ')
	{
		if (input[2][2]==input[2][1])
		{
			if (input[2][2]==input[2][3])
				return win='y';
		}
		if (input[2][2]==input[1][2])
		{
			if (input[2][2]==input[3][2])
				return win='y';
		}
		if(input[2][2]==input[1][3])
		{
			if (input[2][2]==input[3][1])
				return win='y';
		}
	}
	if (input[3][3]!=' ')
	{
		if (input[3][3]==input[3][2])
		{
			if (input[3][3]==input[3][1])
				return win='y';
		}
		if (input[3][3]==input[1][3])
		{
			if (input[3][3]==input[2][3])
			{
				return win='y';
			}
		}
	}
	if (input[1][1]!=' ' && win!='y')
	{
		int count=0;
		for (i=1;i<=3;i++)
		{
			for(j=1;j<=3;j++)
			{
				if (input[i][j]!=' ')
				{
					count=count++;
				}
			}
		}
		if (count==9)
		{
			return win='d';
		}
		else
		{
			return win='n';
		}
	}
	return win='n';
}
For cheaters:

Check to see if the place the asked to put their "token" on is already X or O, if so, tell them to pick again.

For bounds:

Just check if the numbers the entered to put their "token" on is greater then 3 (2) or less then 1 (0).
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