samples
.......\add_a.c
.......\add_s.c
.......\compare_a.c
.......\compare_s.c
.......\delete_a.c
.......\delete_s.c
.......\info.c
.......\modify_a.c
.......\modify_s.c
.......\rdn_a.c
.......\rdn_s.c
.......\search_s.c
.......\search_st.c