定义类Complex如下：class Complex { public:Complex(double r=0,double i=0):Real(r),Imag(i){}; friend定义类Complex如下：class Complex{public:Complex(double r=0,double i=0):Real(r),Imag(i){};friend Complex operator +
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Complex operator+(Complex& a,Complex& b)
{static c;//函数结束时为了保留值
c.Real=a.Real+b.Real;
c.Imag=a.Imag+b.Imag;
return c;
}