ex_2_1\ex_2_1.cpp
...3_1\ex_3_1
......\ex_3_1.cpp
......\Makefile
......\nouse.cpp
.....2\ex_3_2.cpp
......\ex_3_2.h
......\ex_3_2_test
......\ex_3_2_test.cpp
......\libex_3_2.a
......\libex_3_2.so
......\Makefile
......\Makefile.dynamic
......\Makefile.static
ex_2_1
ex_3_1
ex_3_2