============================= board.hpp =======================================
extern SDL_Surface* screen;
class board {
private:
    int brd[3][3]; /* brd contains the blocks. 0 is empty, 1s are Xs and 2s are Os */
    int brdLocs[3][3][2];
    /* brdLocs stores the positions where the marks ( X or O ) are drawn. */
    SDL_Surface* brdImg;
    SDL_Surface* XImg;
    SDL_Surface* OImg;

public:
    board(void);
    void assignBlock(int x, int y, int type);
    void drawBoard(void);
    void drawBlocks(void);
};

board::board(){
    brdImg = SDL_DisplayFormat(IMG_Load("board.png"));
    XImg = SDL_DisplayFormat(IMG_Load("x.png"));
    OImg = SDL_DisplayFormat(IMG_Load("o.png"));
    brdLocs =  { { {28,32}, {112,33}, {220,51} }, { {20,122}, {115,131}, {222,144 } }, { {13,210}, {111,221}, {227,238} } };
    if( brdImg == NULL or XImg == NULL or OImg == NULL){
        fprintf(stderr,"Failed to load one or more GFX files. Please make sure they are all in the same folder as this executable\n");
    }
}

void board::assignBlock(int x, int y, int type){
    if ( brd[x-1][y-1] == 0){
        brd[x-1][y-1] = type;
    //  return true;
    } //else {
        //return false;
    //}
}

void board::drawBoard(void){

}

void board::drawBlocks(void){

}
============================ End board.hpp ==========================================



============================ main.cpp ================================================
#include <SDL/SDL.h>
#include <SDL/SDL_image.h>
#include "board.hpp"

SDL_Surface* screen;

SDL_Event event;

int player;

void player_change (){
    if (player == 1) {
        player = 2;
    } else if (player == 2) {
        player = 1;
    } else {
     player = 1; // This should never happen.. really!
    }
}

int main(void){
    SDL_Init(SDL_INIT_EVERYTHING);
    screen = SDL_SetVideoMode( 320, 320, 32, SDL_SWSURFACE );
    board brd;
    int mousex;
    int mousey;
    bool gameRunning = true;
    while(gameRunning){
        while(SDL_PollEvent(&event)){
            if(event.type == SDL_MOUSEBUTTONDOWN){
                SDL_GetMouseState( &mousex, &mousey );
                if(mousex <= 106){
                    if (mousey <= 106) {
                        brd.assignBlock(1,1,player);
                        player_change();
                    } else if ( mousey > 106 && mousey <= 212 ){
                        brd.assignBlock(1,2,player);
                        player_change();
                    } else if ( mousey > 106 && mousey <= 320 ){
                        brd.assignBlock(1,3,player);
                        player_change();
                    }
                } else if ( mousex > 106 && mousex <= 212 ){
                    if (mousey <= 106) {
                        brd.assignBlock(2,1,player);
                        player_change();
                    } else if ( mousey > 106 && mousey <= 212 ){
                        brd.assignBlock(2,2,player);
                        player_change();
                    } else if ( mousey > 106 && mousey <= 320 ){
                        brd.assignBlock(2,3,player);
                        player_change();
                    }
                } else if ( mousex > 212 && mousex <= 320 ){
                    if (mousey <= 106) {
                        brd.assignBlock(3,1,player);
                        player_change();
                    } else if ( mousey > 106 && mousey <= 212 ){
                        brd.assignBlock(3,2,player);
                        player_change();
                    } else if ( mousey > 106 && mousey <= 320 ){
                        brd.assignBlock(3,3,player);
                        player_change();
                    }
                }
            } else if (event.type == SDL_QUIT) {
                gameRunning = false;
            }
        }

        SDL_Flip( screen );
    }
    SDL_Quit();
    return 0;
}
==================================== end main.cpp =========================================