、定义一个复数类complex，在类中包含两个数据成员，即复数的实数部分real和复数的虚数部分image。在类中定义几个必须的成员函数，再用友元来重载+，-，*，/四种运算符实现复数的四种运算。-, Define a complex type of complex, in the category of data consists of two members, namely, the real part of complex real and the imaginary part of the plural image. In the class definition must be a member of a number of functions, and then UFIDA million to four+,-,*,/ operator overloading to achieve the four computing plural.