/* There are 7 different blocks, and when we create a new one
** to fall from the top, it can be any of these.
*/

void create_block(block *p)
{
     switch(random(7))
     {
                      case 0: p->t=square;          break;
                      case 1: p->t=horizontal_long; break;
                      case 2: p->t=stair1;          break;
                      case 3: p->t=stair3;          break;
                      case 4: p->t=T_up;            break;
                      case 5: p->t=L1_down;         break;
                      case 6: p->t=L2_down;         break;
     }
     place_block(p, SCREEN_WIDTH/2,2);
}