说明：  期末考试大三第一学期课程设计 根据给定的IP地址和子网掩码中1的个数，编程求出相应的广播地址和子网范围，并画出相应的子网络划分后的拓扑图。
(The final exam the first semester junior curriculum design in accordance with the given IP address and subnet mask in the number of one, programming to derive the corresponding broadcast address and subnet range, and draw the corresponding sub-network topology after division.)