基于管道的进程间通信。功能说明：本程序用于判断某目录下存放的若干个求n!的程序是否正确。这些求n!的程序都从其标准输入读入一个整数输入值n,计算出结果后，再往标准输出打印出结果对应的整数。-Inter-process communication based on the pipe.Function:This program is used to determine the accuracy of some programs to get the answer of n! which are st