Pseudo-code is an algorithm description language. The purpose of using pseudocode is to make the described algorithm easy to implement in any programming language (Pascal, C, Java, etc.). Therefore, pseudocode must be clear in structure, simple in code, readable and similar to natural language. Between natural language and programming language. The function of the algorithm is explained in the form of programming language. Use pseudocode, don't stick to specific implementation. Compared with programming languages (such as Java, C++, C, Dephi, etc. ), more similar to natural language. This is a semi-language and non-standard language. The structure of the whole algorithm operation process can be described in a form close to natural language (any familiar words can be used, and the key is to express the meaning of the program).