Hey I am trying to do a tic tac to game, and im getting a few errors that I don't understand, Please help me.

Here is my code:

#include<iostream>
using namespace std;

const int num_rows = 3;
const int num_colm = 3;

void xPlayer(char board[][num_colm], int);

void oPlayer(char board[][num_colm], int);

bool checkBoardX(char board[][num_colm], int);

bool checkBoardO(char board[][num_colm], int);

int main()
{
        int X;
        int O;

        char board[num_rows][num_colm] = {{1,2,3},{4,5,6},{7,8,9}};

        for(int i=0; i < 3; i++)
        {
                cout << endl;
                for(int j=0; j<3; j++)
                        cout << board[i][j];
        }

        do
        {
                xPlayer(board, num_rows);
                if(!checkBoardX(board, num_rows))
                        oPlayer(board, num_rows);
        }
        while (checkBoardX(board, num_rows)||checkBoardO(board, num_rows));

        if(checkBoardX(board, num_rows))
                cout << "Player X wins" <<endl;
        else
                cout << "Player O wins" <<endl;

        return 0;
}

void xPlayer(char board[][num_colm], int num_rows)
{
        int move;

        cout << "Player X, please make your move (1-9): ";
        for(int i = 0; i < 3; i++)
        {
                cout << endl;
                for(int j = 0; j < num_rows; j++)
                cout << board[i][j];
        }
        cin >> move;

        switch(move)
        {
        case 1: board[0][0] = 'X';
                break;
        case 2: board[0][1] = 'X';
                break;
        case 3: board[0][2] = 'X';
                break;
        case 4: board[1][0] = 'X';
                break;
        case 5: board[1][1] = 'X';
                break;
        case 6: board[1][2] = 'X';
                break;
        case 7: board[2][0] = 'X';
                break;
        case 8: board[2][1] = 'X';
                break;
        case 9: board[2][2] = 'X';
                break;
        }
        return;
}

void oPlayer(char board[][num_colm], int num_rows)
{
        int move;

        cout << "Player X, please make your move (1-9): ";
        for(int i = 0; i < 3; i++)
        {
                cout << endl;
                for(int j = 0; j < num_rows; j++)
                cout << board[i][j];
        }

        cin >> move;

        switch(move)
        {
        case 1: board[0][0] = 'O';
                break;
        case 2: board[0][1] = 'O';
                break;
        case 3: board[0][2] = 'O';
                break;
        case 4: board[1][0] = 'O';
                break;
        case 5: board[1][1] = 'O';
                break;
        case 6: board[1][2] = 'O';
                break;
        case 7: board[2][0] = 'O';
                break;
        case 8: board[2][1] = 'O';
                break;
        case 9: board[2][2] = 'O';
                break;
        }
        return;
}

bool checkboardX(char board[][num_colm], int num_rows)
{
        if(board[0][0] == board[0][1] && board[0][2] == board[0][1])
                return true;
        if(board[1][0] == board[1][1] && board[1][2] == board[1][1])
                return true;
        if(board[2][0] == board[2][1] && board[2][2] == board[2][1])
                return true;
        if(board[0][0] == board[1][0] && board[2][0] == board[1][0])
                return true;
        if(board[0][1] == board[1][1] && board[2][1] == board[1][1])
                return true;
        if(board[0][2] == board[1][2] && board[2][2] == board[1][2])
                return true;
        if(board[0][0] == board[1][1] && board[2][2] == board[1][1])
                return true;
        if(board[2][0] == board[1][1] && board[0][2] == board[1][1])
                return true;
        else
        return false;
}

bool checkboardO(char board[][num_colm], int num_rows)
{
        if(board[0][0] == board[0][1] && board[0][2] == board[0][1])
                return true;
        if(board[1][0] == board[1][1] && board[1][2] == board[1][1])
                return true;
        if(board[2][0] == board[2][1] && board[2][2] == board[2][1])
                return true;
        if(board[0][0] == board[1][0] && board[2][0] == board[1][0])
                return true;
        if(board[0][1] == board[1][1] && board[2][1] == board[1][1])
                return true;
        if(board[0][2] == board[1][2] && board[2][2] == board[1][2])
                return true;
        if(board[0][0] == board[1][1] && board[2][2] == board[1][1])
                return true;
        if(board[2][0] == board[1][1] && board[0][2] == board[1][1])
                return true;
        else
        return false;
}

When I compile it this is what I get as my errors.

Undefined                       first referenced
 symbol                             in file
checkBoardX(char (*) [3], int)      /var/tmp//ccLH9ocm.o
checkBoardO(char (*) [3], int)      /var/tmp//ccLH9ocm.o
ld: fatal: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status

Thanks for the help.

your function definitions:

bool checkboardX(char board[][num_colm], int num_rows)
{
...

bool checkboardO(char board[][num_colm], int num_rows)
{

need to match your prototypes which have board capitalized, so they should be writen as:

bool checkBoardX(char board[][num_colm], int num_rows)
{
...

bool checkBoardO(char board[][num_colm], int num_rows)
{

case-sensitivity is easy to miss, however, if you come across this again your first hint should be 'Undefined symbol' meaning the function you were calling was undefined.