Help with Tic-Tac-Toe

#include<iostream>
#include<vector>
#include<string>

using namespace std;
//global constants
char board[3][3];
const int TURN = 9;
int MOVE = 0;
//functions
void instructions();
void displayBoard();
char PLAYER_TURN();
char CPU_TURN();
void checkWinner();
char CPU_TURN(); // Human player for now
int main()
{
	instructions();
	while (TURN < 10)
	{
		if(TURN == 0) 
		displayBoard();
		PLAYER_TURN();
		checkWinner();
		displayBoard();
		CPU_TURN();
		checkWinner();
	}	
		return 0;
}
void instructions()
{
	cout << "Tic-Tac-Toe";
	cout << "The rules are simple, try to outwit your opponent by getting three.\n";
	cout << "In a row before he does.\n";
	cout << "The board looks something like this...";
	
	cout << "		0 | 1 | 2\n";
	cout << "		---------\n";
	cout << "		3 | 4 | 5\n";
	cout << "		---------\n";
	cout << "		6 | 7 | 8\n\n";
}   
void displayBoard()
{
	cout << board[0] << " | " << board[1] << " | " << board[2];
	cout << "---------";
	cout << board[3] << " | " << board[4] << " | " << board[5];
	cout << "---------";
	cout << board[6] << " | " << board[7] << " | " << board[8];
	cout << "\n\n";
}
char PLAYER_TURN()
{
	cout << "select a number from 0-8.";
	cin >> MOVE;
	
	for(MOVE > 9 || MOVE < 1 || ('X' == board[MOVE] || 'O' == board[MOVE]);)
	{
	cout << "You cannot make that move, please try again: ";
	cin >> MOVE;
	}	
	board[MOVE] = 'X';
	TURN++;
	MOVE++;
	
}
char CPU_TURN() // this is a test right now CPU is actually a second player...
{
	cout << "select a number from 0-8.";
	cin >> MOVE;
	
	for(MOVE > 9 || MOVE < 1 ('X' == board[MOVE] || 'O' == board[MOVE]);)
	{
	cout << "You cannot make that move, please try again: ";
	cin >> MOVE;
	}
	board[MOVE] = 'O';
	TURN++;
	MOVE++;
}
void checkWinner()
{
	while(TURN < 10)
	{
	// Check for Player 1...
	
	// diagonal \/
	if (board[0] && board[4] && board[8]== 'X') {cout<<"Player 1 is the winner";break;}
	if (board[6] && board[4] && board[2]== 'X') {cout<<"Player 1 is the winner";break;}
	// vertical |
	if (board[0] && board[3] && board[6]== 'X') {cout<<"Player 1 is the winner";break;}
	if (board[1] && board[4] && board[7]== 'X') {cout<<"Player 1 is the winner";break;}
	if (board[2] && board[5] && board[8]== 'X') {cout<<"Player 1 is the winner";break;}
	// horizontal ---
	if (board[0] && board[1] && board[2]== 'X') {cout<<"Player 1 is the winner";break;}
	if (board[3] && board[4] && board[5]== 'X') {cout<<"Player 1 is the winner";break;}
	if (board[6] && board[7] && board[8]== 'X') {cout<<"Player 1 is the winner";break;}
	
	// Check for Player 2...
	
	// diagonal \/
	if (board[0] && board[4] && board[8]== 'O') {cout<<"Player 2 is the winner";break;}
	if (board[6] && board[4] && board[2]== 'O') {cout<<"Player 2 is the winner";break;}
	// vertical |
	if (board[0] && board[3] && board[6]== 'O') {cout<<"Player 2 is the winner";break;}
	if (board[1] && board[4] && board[7]== 'O') {cout<<"Player 2 is the winner";break;}
	if (board[2] && board[5] && board[8]== 'O') {cout<<"Player 2 is the winner";break;}
	// horizontal ---
	if (board[0] && board[1] && board[2]== 'O') {cout<<"Player 2 is the winner";break;}
	if (board[3] && board[4] && board[5]== 'O') {cout<<"Player 2 is the winner";break;}
	if (board[6] && board[7] && board[8]== 'O') {cout<<"Player 2 is the winner";break;}
	// After 9 MOVES there is no winner...
	if (MOVE == 9){cout<<"The game is over and no one wins.";break;}
	}	
}

for(MOVE > 9 || MOVE < 1 ('X' == board[MOVE] || 'O' == board[MOVE]);)

while(MOVE > 8 || MOVE < 0 || 'X' == board[MOVE] || 'O' == board[MOVE])

for(MOVE > 9 || MOVE < 1 || ('X' == board[MOVE] || 'O' == board[MOVE]);)

MOVE++;

if (MOVE == 9){cout<<"The game is over and no one wins.";break;}

if (TURN == 9){cout<<"The game is over and no one wins.";break;}

if (board[0] && board[4] && board[8]== 'X')

if (board[0] == 'X' && board[4] == 'X' && board[8] == 'X')

if(board[0]&&board[4]&&board[8]== 'X') is correct except that condition won't be met properly.Since, each individual array element is true in itself. 

char board[9];