C++ 复数类的运算

根据以下代码段完善 ?? 处内容及程序内容，以实现规定的输出。

class Complex
{public:Complex(double r=0, double i=0):real(r), imag(i){	}Complex operator+( ?? ) const;//重载双目运算符'+'Complex operator-=( ?? ); //重载双目运算符'-='friend Complex operator-( ?? ) const;//重载双目运算符'-'void Display() const;private:double real;double imag;
};void Complex::Display() const
{cout << "(" << real << ", " << imag << ")" << endl;
}int main()
{double r, m;cin >> r >> m;Complex c1(r, m);cin >> r >> m;Complex c2(r, m);Complex c3 = c1+c2;c3.Display();c3 = c1-c2;c3.Display();c3 -= c1;c3.Display();return 0;
}

#include
using namespace std;class Complex
{public:Complex(double r=0,double i=0):real(r), imag(i){}Complex operator+(Complex &) const;//重载双目运算符'+'Complex operator-=(Complex &); //重载双目运算符'-='friend  const Complex operator-(Complex &,Complex &);//重载双目运算符'-'void Display() const;private:double real;double imag;
};Complex Complex::operator + (Complex &C) const
{return Complex(real+C.real,imag+C.imag);        //重载 + 返回值为相加之后的结果
}Complex Complex::operator-=(Complex &C)
{real=real-C.real;imag=imag-C.imag;return Complex(real,imag);          //重载 -= 返回值为减后结果，且对象本身数值也发生变化
}Complex const operator - (Complex &C1,Complex &C2)  //重载 - 返回值为相减后的结果
{return Complex(C1.real-C2.real,C1.imag-C2.imag);
}void Complex::Display() const
{cout << "(" << real << ", " << imag << ")" << endl;
}int main()
{double r, m;cin >> r >> m;Complex c1(r, m);cin >> r >> m;Complex c2(r, m);Complex c3 = c1+c2;c3.Display();c3 = c1-c2;c3.Display();c3 -= c1;c3.Display();return 0;
}

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