实验三 ......\1 ......\.\A1.txt ......\.\A2.txt ......\.\B1.txt ......\.\B2.txt ......\.\UDPbfcli2.c ......\.\UDPbfser2.c ......\.\UDPclient.c ......\.\UDPserver.c ......\.\udpcli1.c