boolean function ( ) { return numEl == 0 ; }
determines if the queue is empty . concode_field_sep int rear concode_elem_sep Card[] discardPile concode_elem_sep int numEl concode_elem_sep int maxSize concode_elem_sep int front concode_field_sep void insert concode_elem_sep boolean isFull concode_elem_sep void displayQueue concode_elem_sep Card remove concode_elem_sep Card remove concode_elem_sep Card peek concode_elem_sep int peek