unsigned char ARRAY[] = {0,1,2,3,4,5};
void ShiftLeft(void) {
  unsigned char i=0, j=ARRAY[0];
  while( i++ < (sizeof(ARRAY)-1) )
    ARRAY[i-1] = ARRAY[i];
  ARRAY[sizeof(ARRAY)-1] = j;
 }
void ShiftRight(void) {
  unsigned char i=sizeof(ARRAY)-1, j=ARRAY[sizeof(ARRAY)-1];
  while( i-- > 0 )
    ARRAY[i+1] = ARRAY[i];
  ARRAY[0] = j;
 }