设计一个处理复数运算的类，该类中至少有两个成员方法：

复数加法和复数减法运算。

在上述类中添加两个静态方法：求一个复数的模和求一个复

数的复角。 -Design a complex operation processing class in at least two members of the methods: complex addition and complex subtraction. Adding the above two static class method: find a complex number mode and the complex requirements of a complex angle.