Introduction - If you have any usage issues, please Google them yourself
1. Heap allocated storage, said with a string type to achieve the minimum operating Hstring subset. 2. The rest of the abstract string type to achieve the basic operations (such as join, delete, etc.), and the language itself can not use the c string function, you must construct a new function to achieve their own string of basic operations. 3. This demo system is a command interpreter, the cycle of processing user input each command, the command up until the termination of the program. 4. Parameters of legitimacy must be strictly inspected in strict accordance with command input format for input, otherwise the program may not correctly execute instructions.