钢管订购和运输的最优规划 程序使用说明： 两种方法进行 1，运行deal3,输入D,得到单价的矩阵7*15 运行showlj,得到运输的路线； 2, 运行deal2,输入D,得到单价的矩阵7*15 -ordering pipe and the optimal transportation planning process for use : two methods for a running deal3. D input, to be priced mat

This program is to give you practice in the use of UNIX functions fork() and pipe() and to implement message communication between processes. In this program you will implement a simple UNIX shell in C. The shell reads a command line from the input,