例3_4 .....\chap3_4.cpp .....\chap3_4.dsp .....\chap3_4.dsw .....\chap3_4.ncb .....\chap3_4.opt .....\chap3_4.plg .....\Debug .....\.....\chap3_4.obj .....\.....\chap3_4.pdb .....\.....\vc60.pdb