为什么会报错显示Match不是类或命名空间名称

class Time
{
friend void Match::printTime(Time &t);
public:

Time(int hour, int min, int sec)
{
  m_iHour = hour;
  m_iMinute = min;
  m_iSecond = sec;
}
private:
int m_iHour;
int m_iMinute;
int m_iSecond;
};
class Match
{
public:
void printTime(Time &t)
{
  cout << t.m_iHour << "-" << t.m_iMinute << "-" << t.m_iSecond << endl;
}
};
int main()
{
Time t(6, 36, 25);
Match m;
m.printTime(t);
system("pause");
return 0;
}

是土土土呀

2018-09-09

源自：C++远征之模板篇 2-2

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5 回答

qq_谢谢惠顾_2
2018-09-11

#include <iostream>
using namespace std;
class Match;
class Time
{
   friend Match;
public:

   Time(int hour, int min, int sec)
   {
       m_iHour = hour;
       m_iMinute = min;
       m_iSecond = sec;
   }
private:
   int m_iHour;
   int m_iMinute;
   int m_iSecond;
};
class Match
{
public:
   void printTime(Time &t)
   {
       cout << t.m_iHour << "-" << t.m_iMinute << "-" << t.m_iSecond << endl;
   }

};
int main()
{
   Time t(6, 36, 25);
   Match m;
   m.printTime(t);
   system("pause");
   return 0;
}    这个是友元类的实现方式只有在友元情况下 t.m_iMinute才是对的

1 回复有任何疑惑可以回复我~

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qq_谢谢惠顾_2
2018-09-11

#include <iostream>
using namespace std;
class Time
{
public:
   friend void printTime(Time &t);
   Time(int hour, int min, int sec)
   {
       m_iHour = hour;
       m_iMinute = min;
       m_iSecond = sec;
   }
private:
   int m_iHour;
   int m_iMinute;
   int m_iSecond;
};

   void printTime(Time &t)
   {
       cout << t.m_iHour << "-" << t.m_iMinute << "-" << t.m_iSecond << endl;
   }
int main()
{
   Time t(6, 36, 25);

      printTime(t);
   system("pause");
   return 0;
}

1 回复有任何疑惑可以回复我~

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qq_谢谢惠顾_2
2018-09-11

那也是一样的你最需要注意的是t.m_iHour这种写法是不对的因为你的数据是私有的实例化的对象是不能直接访问的

0 回复有任何疑惑可以回复我~

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qq_谢谢惠顾_2
2018-09-10

#include <iostream>
using namespace std;
class Match;
class Time
{
   friend Match;
public:

   Time(int hour, int min, int sec)
   {
       m_iHour = hour;
       m_iMinute = min;
       m_iSecond = sec;
   }
   void printTime()
   {
       cout << m_iHour << "-" << m_iMinute << "-" << m_iSecond << endl;
   }
private:
   int m_iHour;
   int m_iMinute;
   int m_iSecond;
};
class Match
{
public:
   /*void printTime(Time &t)
   {
       cout << t.m_iHour << "-" << t.m_iMinute << "-" << t.m_iSecond << endl;
   }*/
};
int main()
{
   Time t(6, 36, 25);
   /*Match m;
   m.printTime(t);*/
   t.printTime();
   system("pause");
   return 0;

}