Introduction - If you have any usage issues, please Google them yourself
The design of a complex type, able to complete the basic operations between plural, rewrite the method toString (), so that it can output the plural (in the form as follows: real part+ imaginary part i). Designed to be the plural there are three types of structural function, respectively, without parameters, a parameter and two constructor parameters, including the completion of the basic operations of the two complex add, subtract, multiply, divide and transform the complex conjugate.