下面c++有什么问题（运算符重载出了问题）

Question

#include<iostream>
using namespace std;

class time
{int hour,minute,second;
public:
time(int a,int b,int c):hour(a),minute(b),second(c){}
print(){printf("%d,%d,%d",hour,minute,second);}
friend time operator+(time&aa,time&bb);

};

time operator+(time &aa,time &bb)
{return time(aa.hour+bb.hour,aa.minute+bb.minute,aa.second+bb.second);}

main()
{

}

Answer 1

class time
{int hour,minute,second;
public:
time(int a,int b,int c):hour(a),minute(b),second(c){}
void print(){printf("%d,%d,%d",hour,minute,second);}
friend time operator+(time&aa,time&bb);

};

time operator+(time &aa,time &bb)
{return time(aa.hour+bb.hour,aa.minute+bb.minute,aa.second+bb.second);}

是print函数的问题

Answer 2

两个问题：一个是print前加void，另一个是time换成mTime。似乎和其它定义有冲突