定义一个复数类Complex，重载运算符"+"

定义一个复数类Complex，重载运算符"+".使之能用于复数的加法运算，将运算符函数重载为非成员、非友员的普通函数。编写程序求2个复数之和。

#include<iostream>
using namespace std;
class Complex
{
public:
Complex(){real=0;imag=0;}
Complex(double r,double i){real=r;imag=i;}
void display();
double real;
double imag;
};

void Complex::display()
{
cout<<"("<<real<<","<<imag<<"i)";
}

Complex operator +(Complex &c1,Complex &c2)
{
Complex p;
p.real=c1.real+c2.real;
p.imag=c1.imag+c2.imag;
return p;
}
int main()
{
Complex c1(5,2),c2(1,3),c3;
c1.display();
cout<<"+";
c2.display();
cout<<"=";
c3=c1+c2;
c3.display();

}

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