例10.3.txt

《C++程序设计(谭浩强)》代码,均按章节分类

例10.3 将运算符“+”重载为适用于复数加法，重载函数不作为成员函数，而放在类外，作为Complex类的友元函数。
#include <iostream>
using namespace std;
class Complex
{public:
Complex( ){real=0;imag=0;}
Complex(double r,double i){real=r;imag=i;}
friend Complex operator + (Complex &c1,Complex &c2);//重载函数作为友元函数
void display( );
 private:
double real;
double imag;
};

Complex operator + (Complex &c1,Complex &c2)          //定义作为友元函数的重载函数
{return Complex(c1.real+c2.real, c1.imag+c2.imag);}

void Complex∷display( )
{cout<<″(″<<real<<″,″<<imag<<″i)″<<endl;}
int main( )
{Complex c1(3,4),c2(5,-10),c3;
c3=c1+c2;
cout<<″c1=″; c1.display( );
cout<<″c2=″; c2.display( );
cout<<″c1+c2 =″; c3.display( );
}