自己的复数类，简单好用，而且清晰易懂，并且在此基础上进一步改动，扩展功能，相比原来自带的复数类而言，没有冗余的部分功能。-Their plural class, easy to use, and lucid, and on this basis, further changes, extensions, compared to the original complex number class comes, there is no redundancy in some functions.