Petit probleme avec la SDL

int continuer = 1;
SDL_EnableKeyRepeat(1,1);
SDL_Event event;
while (continuer)
    {
t = 1;
s = 1;
u = 1;
w = 1;
x = 1;


        SDL_WaitEvent(&event);
        switch(event.type)
        {
            case SDL_QUIT:
                continuer = 0;
            case SDL_KEYDOWN:
             switch(event.key.keysym.sym)
             {
            case SDLK_UP:
                    if(s == 1)
                    {
                         RS232_SendByte(5,'3');
                    //s++;

                    }
                    break;
            case SDLK_RIGHT:
                if(u==1)
                {
                     RS232_SendByte(5,'4');
                    u++;
                }


                break;
            case SDLK_LEFT:
                if(w==1)
                {
                     RS232_SendByte(5,'5');
                   //  w++;
                }
                break;
            case SDLK_DOWN:
                if(x==1)
                {
                    RS232_SendByte(5,'1');
                   // x++;
                }

                break;

}
             break;
          case SDL_KEYUP:
            RS232_SendByte(5,'0');
                         // t++;
                        break;


        }