//关于友元：可以*取得friend中private成员
//相同class的各object互为友元
#include <iostream>
using namespace std;
class complex{
    public:
         complex(int r=0,int i=0)
         :re(r),im(i){
         }
         int func(const complex& friends)
         {
             return friends.re+friends.im;
         }
    private:
        int re,im;
}; 
int main()
{
    complex c1(3,4);
    complex c2;
    cout<<c2.func(c1)<<endl;
    return 0;
}