Kaktus C++ SDL game

#include "SDL/SDL.h"

using namespace std;

//variabler
bool quit = false;
SDL_Event event;
Uint8 *key;
int playerX = 0;
int playerY = 0;
bool menuQuit = false;


SDL_Surface* background = NULL;
SDL_Surface* screen = NULL;
SDL_Surface* player = NULL;

SDL_Surface* menuBackground = NULL;
SDL_Surface* menuStart = NULL;
SDL_Surface* menuExit = NULL;

SDL_Surface* arrow = NULL;


void apply_surface(int x, int y, SDL_Surface* source, SDL_Surface* destination) {
    SDL_Rect offset;

    offset.x = x;
    offset.y = y;

    SDL_BlitSurface(source, NULL, destination, &offset);
}

void paint() {
    SDL_BlitSurface(background, NULL, screen, NULL);
    apply_surface(playerX, playerY, player, screen);
}

void clean() {
    SDL_FreeSurface(background);
    SDL_FreeSurface(player);
    SDL_FreeSurface(menuBackground);
    SDL_FreeSurface(menuStart);
    SDL_FreeSurface(menuExit);
    SDL_FreeSurface(arrow);
}

void menu() {


    bool up = false;

    int arrowY = 125;

    menuBackground = SDL_LoadBMP("image/menu/background.bmp");
    menuStart = SDL_LoadBMP("image/menu/start.bmp");
    menuExit = SDL_LoadBMP("image/menu/exit.bmp");
    arrow = SDL_LoadBMP("image/menu/arrow.bmp");

    while(menuQuit == false) {
        if( SDL_PollEvent (&event)) {

                apply_surface(0,0,menuBackground, screen);
                apply_surface(200,100,menuStart, screen);
                apply_surface(200,180,menuExit, screen);
                apply_surface(165, arrowY, arrow, screen);

                if(event.type == SDL_KEYDOWN) {

                    switch(event.key.keysym.sym) {
                        case SDLK_UP:
                            if(up == true) {
                                arrowY-=80;
                                up = false;
                            }
                            break;

                        case SDLK_DOWN:
                            if(up == false) {
                                arrowY+=80;
                                up = true;
                            }
                            break;

                        case SDLK_SPACE:
                            if(up == false) {
                                menuQuit = true;
                            } else if(up == true) {
                                quit = true;
                                menuQuit = true;
                            }
                    }
                }

                else if(event.type == SDL_QUIT) {
                    quit = true;
                }
            }

            SDL_Flip(screen);
        }

}

void keyInput() {
    if( SDL_PollEvent (&event)) {

            if(event.type == SDL_KEYDOWN) {

                switch(event.key.keysym.sym) {

                    case SDLK_DOWN:
                        playerY+=1;
                        break;

                    case SDLK_UP:
                        playerY-=1;
                        break;

                    case SDLK_RIGHT:
                        playerX+=1;
                        break;

                    case SDLK_LEFT:
                        playerY-=1;
                        break;


                    //exit
                    case SDLK_ESCAPE:
                        quit = true;
                        break;
                }
            }

            else if(event.type == SDL_QUIT) {
                quit = true;
            }
        }
}


int main(int argc, char* args[]) {

    SDL_Init(SDL_INIT_EVERYTHING);
    SDL_WM_SetCaption("Kaktus SDL Project", NULL);

    screen = SDL_SetVideoMode(640, 480, 32, SDL_SWSURFACE);
    background = SDL_LoadBMP("image/background.bmp");
    player = SDL_LoadBMP("image/player.bmp");

    menu();

    while(quit == false) {
        paint();

        keyInput();

        SDL_Flip(screen);
    }

    clean();

    SDL_Quit();
    return 0;
}