Copyright: K5 produced, will be fine, welcome collection comment https://blog.csdn.net/a694861283/article/details/91039559
I. Introduction
String processing involves coding will have problems with the function extension Ascii character A represents, with the suffix function W (wide char) represent Unicode code
Two .Ascii code and Unicode code difference
Ascii code is only one byte, only supports English
There are two-byte Unicode code, full language support