2、　　程序中用一个栈形象的表示为车厢的调度站。演示程序以用户和计算机的对话方式执行，即在计算机终端上显示“提示信息”之后，由用户在键盘上输入演示程序中规定的命令；相应的输入数据和运算结果显示在其后。程序的输入为整形数据，并且要在1—20之间，若超出此范围，会显示“输入错误”的提示信息。-2, the program that used the image of a stack for the car dispatch station. Demo program to computer users and the implementation of dialogue, or a computer terminal display " reminder" , the keyboard input by the user specified in the order demo program　the corresponding input data and calculation results in the following. Data input for the shaping process, and to between 1-20, if beyond this range, will display " input error"　message.