多进程并发运行的程序，它由不同的进程完成下列工作：



（1）接收键盘输入进程

负责接收用户的键盘输入，并以适当的方式将由键盘获得的数据交给其它进程处理。



（2）显示进程

负责全部数据显示任务，包括键盘输入数据的显示和提示信息的显示。



（3）分发数据进程

将键盘输入的数据分为3类，即字母、数字和其它，并分别将字母写入文件letter.txt中，数字写入文件number.txt中，除字母和数字外其它数据丢弃。-Multi-process programs running concurrently, which consists of different processes to complete the following tasks: (1) receiving keyboard input process is responsible for receiving the user　s keyboard input, and keyboard in an appropriate manner the data obtained by other processes to deal with. (2) shows that the process responsible for all data tasks, including data display and keyboard input message of the show. (3) the process of distributing data to keyboard input data is divided into three categories, namely letters, numbers, and other, and the letters were written to the file letter.txt, the number written to the file number.txt, in addition to other letters and figures, data is discarded.