deleted:    ex1_11.c
	deleted:    ex1_12.c
	deleted:    ex1_13.c
	deleted:    ex1_14.c
	deleted:    ex1_15.c
	deleted:    ex1_16.c
	deleted:    ex1_17.c
	deleted:    ex1_18.c
	deleted:    ex1_19.c
	deleted:    ex1_20.c
	deleted:    ex1_21.c
	deleted:    ex1_22.c
	deleted:    ex1_23.c
	deleted:    ex1_24.c
	modified:   ex1_8.c
	modified:   ex1_9.c