//f0806.cpp
//Time类的operator++应用
#include<iostream>
#include<iomanip>
using namespace std;
class Time{
int hour,minute,second;
public:
void set(int h,int m,int s)
{hour=h;minute=m;second=s;}
friend Time&operator++(Time& a);
friend Time operator++(Time& a,int);
friend ostream& operator<<(ostream& o,const Time& t);
};
Time& operator++(Time& a)
{
if(!(a.second=(a.second+1)%60)&&!(a.minute=(a.minute+1)%60))
a.hour=(a.hour+1)%24;
return a;
}
Time operator++(Time& a,int )
{Time t(a);
if(!(a.second=(a.second+1)%60)&&!(a.minute=(a.minute+1)%60))
a.hour=(a.hour+1)%24;
return t;
}
ostream& operator<<(ostream& o,const Time& t)
{o<<setfill('0')<<setw(2)<<t.hour<<":"<<setw(2)<<t.minute<<":"
return o<<setw(2)<<t.second<<"\n"<<setfill(' ');
}
int main()
{Time t;
t.set(11,59,58);
cout<<t++;
cout<<++t;
}

#include<iomanip>
#include<iostream.h>

class Time{
private:
int hour,minute,second;
public:
Time()
{
hour = 0;
minute = 0;
second = 0;
}
Time(const Time & t)
{
hour = t.hour;
minute = t.minute;
second = t.second;
}
void set(int h,int m,int s)
{hour=h;minute=m;second=s;}
friend Time&operator++(Time& a);
friend Time operator++(Time& a,int);
friend ostream& operator<<(ostream& o,const Time& t);
};
Time& operator++(Time& a)
{
if(!(a.second=(a.second+1)%60)&&!(a.minute=(a.minute+1)%60))
a.hour=(a.hour+1)%24;
return a;
}
Time operator++(Time& a,int )
{Time t(a);
if(!(a.second=(a.second+1)%60)&&!(a.minute=(a.minute+1)%60))
a.hour=(a.hour+1)%24;
return t;
}
ostream& operator<<(ostream& o,const Time& t)
{
o<<t.hour<<":"<<t.minute<<":"<<t.second<<"\n";
return o;
}

int main()
{Time t;
t.set(11,59,58);
cout<<t++;
cout<<++t;
return 0;
}

太谢谢一楼了.麻烦你了.
不过我还是有点不明白使用友元时用#include<iostream>与#include<iostream.h>有什么不同.
是不是编译器问题.

两个文件里面的东西可是不一样的，虽然功能是差不多．

那是不是用友元时就要用#include<iostream.h>头文件.
至少在VC++6.0的环境中是不是要这样.

o<<setfill('0')<<setw(2)<<t.hour<<":"<<setw(2)<<t.minute<<":"
return o<<setw(2)<<t.second<<"\n"<<setfill(' ');

用了iostream后o<<t.hour这就是另一个函数调用Time类的私有变量,
这时就报错.
用那个头文件你自己看着办吧!

两个不同的标准，
建议使用#include<iostream>

谢谢了

要不麻烦七楼"yuyunliuhen"用#include<iostream>此头文件将上面程序调试出来发给我.不胜感激!!!

除了
{o<<setfill('0')<<setw(2)<<t.hour<<":"<<setw(2)<<t.minute<<":"
少个分号外一切正常(vs2005)