Tic Tac Toe

/*
Tic Tac Toe, by Cow_Fu
 */

//include the libraries
#include <iostream>
#include <string>

//use standard namespace

using namespace std;

//declare functions
void showBoard();
bool moveIsValid(int m);
int whoWon(); //returns 0 if no one has won, 1 if player 1 has won and 2 if player 2 has won

//declare global variables
char Board[9];


void main() {
    //declare local variables
    string Player_1_Name;
    string Player_2_Name;
    int Whose_Turn = 1;   //1 means its player 1's turn, 2 means its player 2's turn
    int Move; //stores where the player wants to move
    int Total_Moves = 0;



    //assign values to the playing board
    Board[0] = '0';
    Board[1] = '1';
    Board[2] = '2';
    Board[3] = '3';
    Board[4] = '4';
    Board[5] = '5';
    Board[6] = '6';
    Board[7] = '7';
    Board[8] = '8';


    //get player names
    cout << "Player 1: Please enter your name." << endl;
    cin >> Player_1_Name;

    cout << "Player 2: Please enter your name." << endl;
    cin >> Player_2_Name;

    while(whoWon ( ) == 0 && Total_Moves < 9)
    {



        //do this until the player chooses a valid move
        do {

            //show the board
            showBoard();

            //tell which player to move
            if (Whose_Turn == 1) {
                cout << Player_1_Name << ": It's Your turn" << endl;
            }
            else {
                cout << Player_2_Name << ": It's Your turn" << endl;
            }

            //get the move
            cout << "Enter the number of the spot where you'd like to move" << endl;
            cin >> Move;

        }
        while (moveIsValid(Move) != true);

        //Add 1 to Total_Moves
        Total_Moves++;

        cout << endl;
        cout << Total_Moves << endl;
        cout << endl;



        //change whose turn it is
        switch (Whose_Turn) {
            case (1): {
                Board[Move] = 'x';
                Whose_Turn = 2;
                break;
            }

            case (2): {
                Board[Move] = 'o';
                Whose_Turn = 1;
            }

        }
    }
    //show the board
    showBoard();

    if(whoWon() == 1)
    {
        cout << Player_1_Name << " has won the game!" << endl;
        system("PAUSE");
    }
    else if(whoWon() == 2)
    {
        cout << Player_2_Name << " has won the game!" << endl;
        system("PAUSE");
    }
    else
    {
        cout << "It's a tie game!" << endl;
        system("PAUSE");
    }
}

void showBoard ( )
{
    cout << endl;
    cout << Board[0] << " | " <<  Board[1] << " | " << Board[2] << endl;
    cout << "--+---+--" << endl;
    cout << Board[3] << " | " <<  Board[4] << " | " << Board[5] << endl;
    cout << "--+---+--" << endl;
    cout << Board[6] << " | " <<  Board[7] << " | " << Board[8] << endl;
    cout << endl;
}

bool moveIsValid (int m)
{
    if(Board[m] != 'x' && Board[m] != 'o')
    {
        return true;
    }
    else
    {
        return false;
    }
}

int whoWon( )
{
    if(Board[0] == Board[1] && Board[1] == Board[2])
    {
        if(Board[0] == 'x')
        {
            return 1;
        }
        else
        {
            return 2;
        }

    }

    if(Board[3] == Board[4] && Board[4] == Board[5])
    {
        if(Board[3] == 'x')
        {
            return 1;
        }
        else
        {
            return 2;
        }

    }
    if(Board[6] == Board[7] && Board[7] == Board[8])
    {
        if(Board[6] == 'x')
        {
            return 1;
        }
        else
        {
            return 2;
        }

    }
    if(Board[0] == Board[3] && Board[3] == Board[6])
    {
        if(Board[0] == 'x')
        {
            return 1;
        }
        else
        {
            return 2;
        }

    }
    if(Board[1] == Board[4] && Board[4] == Board[7])
    {
        if(Board[1] == 'x')
        {
            return 1;
        }
        else
        {
            return 2;
        }

    }
    if(Board[2] == Board[5] && Board[5] == Board[8])
    {
        if(Board[2] == 'x')
        {
            return 1;
        }
        else
        {
            return 2;
        }

    }
    if(Board[2] == Board[4] && Board[4] == Board[6])
    {
        if(Board[2] == 'x')
        {
            return 1;
        }
        else
        {
            return 2;
        }

    }
    if(Board[0] == Board[4] && Board[4] == Board[8])
    {
        if(Board[0] == 'x')
        {
            return 1;
        }
        else
        {
            return 2;
        }

    }
    return 0;
}