linux系统下的文件操作实验程序，完成的功能如下。

在一个半径为R的监测区域，随机分布有M个节点，每个节点的感应半径为r，请完成：

（1）建立节点的位置信息文件

（2）建立网络的拓扑信息文件

-linux operating system files under the experimental procedures, the completion of the function as follows. Radius of R in a monitoring region, a random distribution of M nodes, each node of the sensor radius r, please complete: (1) to establish the location of the node information file (2) the establishment of the network topology information file