例3_1 .....\chap3_1.cpp .....\chap3_1.dsp .....\chap3_1.dsw .....\chap3_1.ncb .....\chap3_1.opt .....\chap3_1.plg .....\Debug .....\.....\chap3_1.obj .....\.....\chap3_1.pdb .....\.....\vc60.pdb