第八周项目2

#include <iostream>
using namespace std;
class CTime
{private:
	unsigned short int hour;    // 时
	unsigned short int minute;  // 分
	unsigned short int second;  // 秒
 public:
	CTime(int h=0,int m=0,int s=0):hour(h),minute(m),second(s){}   
	void setTime(int h,int m,int s);
	void display();
	//比较运算符(二目)的重载
	bool operator > (CTime &t);
	bool operator < (CTime &t);
	bool operator >= (CTime &t);
	bool operator <= (CTime &t);
	bool operator == (CTime &t);
	bool operator != (CTime &t);
	//二目运算符的重载
	CTime operator+(CTime &c);//返回c所规定的时、分、秒后的时间，例t1(8,20,25),t2(11,20,50)，t1+t2为:41:15
	CTime operator-(CTime &c);//对照+理解
	CTime operator+(int s);//返回s秒后的时间
	CTime operator-(int s);//返回s秒前的时间
	//一目运算符的重载
	CTime operator++( int);//后置++，下一秒
	CTime operator++();//前置++，下一秒，前置与后置返回值不一样
	CTime operator--( int);//后置--，前一秒
	CTime operator--();//前置--，前一秒
	//赋值运算符的重载     
	CTime operator+=(CTime &c);
	CTime operator-=(CTime &c);
	CTime operator+=(int s); 
	CTime operator-=(int s); 
};
//下面实现所有的运算符重载代码。
void CTime::display()
{
  cout << hour << ":" << minute << ":" << second << endl;
}
bool CTime::operator > (CTime &t)  
{  
    if (hour>t.hour)  
        return true;  
    else if(hour==t.hour&&minute>t.minute)  
        return true;  
    else if(minute==t.minute&&second>t.second)  
        return true;  
    else  
        return false;
}  
bool CTime::operator<(CTime &t)  
{  
    if(hour<t.hour)  
        return true;  
    else if(hour==t.hour&&minute<t.minute)  
        return true;  
    else if(minute==t.minute&&second<t.second)  
        return true;  
    else  
        return false;  
}  
bool CTime::operator>= (CTime &t)  
{  
    if (hour>t.hour)  
        return true;  
    else if(hour==t.hour&&minute>t.minute)  
        return true;  
    else if (minute==t.minute && second>=t.second)  
        return true;  
    else  
        return false;  
}  
bool CTime::operator<=(CTime &t)  
{  
    if (hour<=t.hour)
        return true;  
    else if(minute<=t.minute)  
        return true;  
    else if (second<=t.second)  
        return true;  
    else  
        return false;  
}  
bool CTime::operator==(CTime &t)  
{  
    if (hour==t.hour&&minute==t.minute&&second==t.second)  
        return true;  
    else  
        return false;  
}  
bool CTime::operator!=(CTime &t)  
{  
    if (hour==t.hour&&minute==t.minute&&second==t.second)  
        return false;  
    else  
        return true;  
}  
CTime CTime::operator+(CTime &c){  
  CTime ct(*this); 
    if (ct.second+c.second>=60)   
    {  
        ct.second=ct.second+c.second-60;  
        ++ct.minute;  
    }  
    else  
        ct.second=ct.second+c.second;  
    if (ct.minute+c.minute>=60)  
    {  
        ct.minute=ct.minute+c.minute-60;  
        ++ct.hour;  
    }  
    else  
        ct.minute=ct.minute+c.minute;  
    if (ct.hour+c.hour>=60)  
        ct.hour=ct.hour+c.hour-60;  
    else  
        ct.hour=ct.hour+c.hour;  
  
    return ct;  
}  
CTime CTime::operator-(CTime &c)  
{  
    CTime ct(*this);  
    if (ct.second<c.second)  
    {  
        --ct.minute;  
        ct.second=ct.second+60-c.second;  
    }  
    else  
        ct.second=ct.second-c.second;  
    if (ct.minute<c.minute)  
    {  
        --ct.hour;  
        ct.minute=ct.minute+60-c.minute;  
  
    }  
    else  
        ct.minute=ct.minute-c.minute;  
    if (ct.hour < c.hour)  
        ct.hour = ct.hour + 24 - c.hour;  
    else  
        ct.hour=ct.hour-c.hour;  
    return ct;  
}  
CTime CTime::operator+(int s)  
{  
    CTime ct;  
  
    ct.hour=s/3600;  
    s=s%3600;  
    ct.minute=s/60;  
    ct.second=s%60;  
  
    return (*this + ct);  
}  
CTime CTime::operator-(int s)  
{  
    CTime ct;  
  
    ct.hour=s/3600;  
    s=s%3600;  
    ct.minute=s/60;  
    ct.second=s%60;  
    return (*this - ct);  
}  
CTime CTime::operator++(int)  
{  
    CTime tp(*this);  
  
    *this=*this+1;  
  
    return tp;  
}  
CTime CTime::operator++()  
{  
    return (*this=*this+1);  
}  
CTime CTime::operator--(int)  
{  
    CTime tp(*this);  
  
    *this=*this-1;  
  
    return tp;  
}  
CTime CTime::operator--()  
{  
    return(*this=*this-1);//需要改变其值   
}  
CTime CTime::operator+=(CTime &c)  
{  
    return (*this=*this+c);  
}  
CTime CTime::operator-=(CTime &c)  
{  
    return (*this=*this - c);  
}  
CTime CTime::operator+=(int s)  
{  
    return (*this=*this+s);  
}  
CTime CTime::operator-=(int s)  
{  
    return (*this=*this-s);  
}  
int main()
{
	CTime t1(8,20,25),t2(11,20,50),t;
	cout<<"t1为：";
	t1.display();
	cout<<"t2为：";
	t2.display();
	cout<<"下面比较两个时间大小：\n";
	if (t1>t2) cout<<"t1>t2"<<endl;
	if (t1<t2) cout<<"t1<t2"<<endl;
	if (t1==t2) cout<<"t1＝t2"<<endl; 
	if (t1!=t2) cout<<"t1≠t2"<<endl;
	if (t1>=t2) cout<<"t1≥t2"<<endl;
	if (t1<=t2) cout<<"t1≤t2"<<endl;
	cout<<endl;
	t = t1 + t2;  
    cout << "t1+t2=";  
    t.display();  
    t = t1 - t2;  
    cout << "t1-t2=";  
    t.display();  
    cout << "t1后退100秒。t2-100=";
    t1 = t1 -123;  
    t1.display();  
    cout << "t2前进321秒。t2+321=";  
    t2 = t2 + 321;  
    t2.display();  
    cout << "++t1=";  
    (++t1).display();  
    cout << "t1=";  
    t1.display();  
    cout << "--t1=";  
    (--t1).display();  
    cout << "t1=";  
    t1.display();  
    cout << "t2++=";  
    (t2++).display();  
    cout << "t2=";  
    t2.display();  
    cout << "t2--=";  
    (t2--).display();  
    cout << "t2=";  
    t2.display();  
    cout << "(t1+=t2)=";  
    t1+=t2;  
    t1.display();  
    cout << "(t1-=t2)=";  
    t1-=t2;  
    t1.display();  
    cout<< "t1前进365秒。(t1+=365)=";  
    t1-=365;  
    t1.display();  
    cout << "t2后退3秒。(t2-=3)=";  
    t2-=3;  
    t2.display();  
    return 0;  
}  

运行结果：

错误提示：

--------------------Configuration: Cpp1 - Win32 Debug--------------------
Linking...
Cpp1.obj : error LNK2001: unresolved external symbol "public: __thiscall CTime::CTime(int,int,int)" (??0CTime@@QAE@HHH@Z)
Debug/Cpp1.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

Cpp1.exe - 2 error(s), 0 warning(s)

pp1.obj：错误LNK2001：无法解决的外部符号“公众：__thiscall CTime：：CTime（int，int，int）”（？0ctime？@ @ QAE @ HHH”Z）

调试\ / cpp1.exe：致命错误lnk1120：1未解决的疑团