C++运算符重载（输入输出运算符重载）

class complex1
{
public:
	complex1(double r=0,double i=0){real = r;imag=i;}
	friend istream &operator>>(istream &in,complex1 &c);
	friend ostream &operator<<(ostream &ou,complex1 &c);
	void display(){cout<<real<<"____"<<imag<<endl;}
private:
	double real,imag;
};
istream &operator >>(istream &in,complex1 &c)//重载“>>”输入运算符
{
	in>>c.real>>c.imag;
	return in;
}
ostream &operator <<(ostream &ou,complex1 &c)//重载“<<”输出运算符
{
	ou<<c.real<<"+"<<c.imag;
	return ou;
}