创建一个复数类，定义属性：实部、虚部。定义方法：复数加法、复数减法、复数乘法、求实部，求虚部，将复数输出，判断两个复数相等。通过一个类举例验证这些方法。-create a plural categories, defined attributes : real and imaginary parts. Definition : plural addition, the plural subtraction, multiplication complex, realistic Ministry for the imaginary part of the plural output, the same judge two plural. For category through a validation of these methods.