1.本程序中,实现集合的交,并差,求补,求子串运算.集合的元素限定在[‘a’ … ’z’].集合的输入形式为输入一个字符串,以0和回车符号作为结束.

2. 演示程序以用户和计算机对话的方式,即在计算机终端显示”提示信息”之后,由用户在键盘上输入演示程序中规定的运算命令:相应的输入数据和运算结果显示在其后.

-1. The program and sets policy, worse, seeking fill, Praying for Bearing Children string operations. Set elements confined to the [ 'a' ... 'z']. Set the input forms for the importation of a string, Enter 0 and as a symbol end. 2. Demonstration Program to computer users and dialogue, that the computer terminals showed "a message", by the user at the keyboard input demonstration procedures in the operation order : corresponding to the input data and calculation results in later.