C语言实验指导书http://lx.cdn.baidupcs.com/file/5d0eab7492d7c0758731dcb2497c19a3?bkt=p2-nj-213&xcode=f61ab79a7f49227c1de94bf99e60fb8bd9f65991cb82d0caa271ffda32bcb45b&fid=2517212642-250528-646737879400150&time=1421201688&sign=FDTAXERLBH-DCb740ccc5511e5e8fedcff06b081203-7pb3P%2FB5HWZmbkhLBGdi%2FPDMl4w%3D&to=c