operator<<的问题。

[yumangmang]

大家好！
清明节快乐！！

今天我学习C++的时候学到了操作符重载这个部分，看了书以后自己按照书里的范例背写一个类的设计，但是总是出现这个错误：
--------------------Configuration: time - Win32 Debug--------------------
Compiling...
mytime0.cpp
E:\VC++STUDY\time\mytime0.cpp(83) : error C2248: 'hours' : cannot access private member declared in class 'Time'
e:\vc++study\time\mytime0.h(10) : see declaration of 'hours'
E:\VC++STUDY\time\mytime0.cpp(83) : error C2248: 'minutes' : cannot access private member declared in class 'Time'
e:\vc++study\time\mytime0.h(11) : see declaration of 'minutes'
Error executing cl.exe.

time.exe - 2 error(s), 0 warning(s)
意思好像是说我不能访问私有成员，问题是在类的设计里面使用了友元，应该可以通过阿，而且我发现我写的代码和书里的也没有什么区别，但就是总出现上面的错误，各位给看看吧：

类定义文件mytime0.h:

#ifndef MYTIME0_H_
#define MYTIME0_H_
#include<iostream>

using namespace std;

class Time
{
private:
	int hours;
	int minutes;
public:
	Time();
	Time(int hr,int min = 0);
	void addmin(int min);
	void addhr(int hr);
	void reset(int hr = 0,int min = 0);
	Time sum(const Time & t);
	Time operator+(const Time & t);
	Time operator-(const Time & t);
	Time operator*(unsigned int n);
	friend Time operator*(unsigned int n,Time & t){return t * n;}
	void show()const;
	friend ostream & operator<<(ostream & os,const Time & t);
};

#endif

类方法文件mytime.cpp

#include<iostream>
#include"mytime0.h"

using namespace std;

Time::Time()
{
	hours = minutes = 0;
}

Time::Time(int hr,int min)
{
	hours = hr;
	minutes = min;
}

void Time::addmin(int min)
{
	minutes += min;
	hours += minutes / 60;
	minutes %= 60;
}

void Time::addhr(int hr)
{
	hours += hr;
}

void Time::reset(int hr,int min)
{
	hours = hr;
	minutes = min;
}

Time Time::sum(const Time & t)
{
	Time sm;
	sm.minutes = minutes + t.minutes;
	sm.hours =hours + t.hours + sm.minutes / 60;
	sm.minutes %= 60;
	return sm;
}

Time Time::operator+(const Time & t)
{
	Time sm;
	sm.minutes = minutes + t.minutes;
	sm.hours =hours + t.hours + sm.minutes / 60;
	sm.minutes %= 60;
	return sm;
}

Time Time::operator-(const Time & t)
{
	Time sub;
	sub.minutes = minutes - t.minutes;
	if(sub.minutes > 0)
		sub.hours = hours - t.hours;
	else{
		sub.minutes += 60;
		sub.hours = hours - t.hours - 1;
	}
	return sub;
}

Time Time::operator*(unsigned int n)
{
	Time mul;
	mul.minutes = minutes * n;
	mul.hours = hours * n + mul.minutes/60;
	mul.minutes %= 60;
	return mul;
}


void Time::show()const
{
	cout<<"it's "<<hours<<" hour(s),"<<minutes<<" minute(s)"<<endl;
}

ostream & operator<<(ostream & os,const Time & t)
{
	os<<"it's "<<t.hours<<" hour(s),"<<t.minutes<<" minute(s)"<<endl;//错误行，咋回事阿？？
	return os;
}

[effective_person]

呵呵。
你应该用的vc6.0
vc6.0 不支持标准的c++
可以这样改
头文件#include <iostream>
using namespace std;
改成：
#include <iostream.h>

[Inhibitory]

没有用VC，没遇到过这个问题，换个环境编译试试，　VC如果没有升级到SP6的话，对C++标准支持不太好．

[WingForce]

VC 6.0中要定义友元函数时要用头文件 #include <iostream.h> 代替 #include <iostream> using namespace std;

[taodm]

class Time
{
private:
int hours;
int minutes;
public:
Time();
Time(int hr,int min = 0);
void addmin(int min);
void addhr(int hr);
void reset(int hr = 0,int min = 0);
Time sum(const Time & t);
Time operator+(const Time & t);
Time operator-(const Time & t);
Time operator*(unsigned int n);
friend Time operator*(unsigned int n,Time & t){return t * n;}
void show()const;
friend ostream & operator<<(ostream & os,const Time & t)
{
os<<"it's "<<t.hours<<" hour(s),"<<t.minutes<<" minute(s)"<<endl;//错误行，咋回事阿？？
return os;
}

};

[hellodudu]

我用dev-c++编译没问题啊
lz试试把类的实现文件和头文件放一起

[hellodudu]

把mytime.cpp内容放到mytime0.h中试试

[yumangmang]

非常感谢各位的回复！！
我使用的是vc++6编译器，据说是带sp6的（至少启动界面上有sp6字样）。
按照各位的指点，无论是使用把<iotream>改成<iostream.h>的做法，还是将友元函数代码写到类定义内部的做法都使问题得到了解决，所以再次表示感谢！
但是这让我很郁闷，难道大名鼎鼎的微软出品的vc++编译器不值得信任么？