项目2

#include<iostream>using namespace std;class CTime{private:    unsigned short int hour;    unsigned short int minute;    unsigned short int second;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();    bool operator >(CTime &t);    bool operator <(CTime &t);    bool operator >=(CTime &t);    bool operator <=(CTime &t);    bool operator ==(CTime &t);    bool operator !=(CTime &t);    CTime operator+(CTime &c);    CTime operator-(CTime &c);    CTime operator+(int c);    CTime operator-(int c);    CTime operator++();    CTime operator++(int);    CTime operator--();    CTime operator--(int);    CTime operator+=(CTime &c);    CTime operator-=(CTime &c);    CTime operator+=(int c);    CTime operator-=(int c);};void CTime::setTime(int h,int m,int s){      hour=h;      minute=m;      second=s;}bool CTime::operator >(CTime &t){    if(hour>t.hour)      return true;    else if(hour==t.hour && minute>t.minute)      return true;    else if(hour==t.hour && 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(hour==t.hour && 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(hour==t.hour && minute==t.minute && second>t.second)      return true;      else if(hour==t.hour && 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(hour==t.hour && minute==t.minute && second<t.second)      return true;      else 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 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 a;  a.hour=hour+c.hour;  a.minute=minute+c.minute;  a.second=second+c.second; if(a.second>=60){   a.minute=a.minute+a.second/60;    a.second=a.second%60;if(a.minute>=60){a.hour=a.hour+a.minute/60;a.minute=a.minute%60;} }  return a;}CTime CTime::operator-(CTime &c){    CTime a;  a.hour=hour-c.hour;  a.minute=minute-c.minute;  a.second=second-c.second; if(a.second<=0){   a.second=60-a.second;   a.minute-=1;   if(a.minute<=0){   a.minute=60-a.minute;   a.hour-=1;   } }  return a; }CTime CTime::operator+(int c){   CTime a;  a.second=second+c; if(a.second>=60){    ++a; }  return a;}CTime CTime::operator-(int c){CTime a;  a.second=second+c; if(a.second<=0){    --a; }  return a; }CTime CTime::operator++(){   if(++second>=60){        second-=60;       ++minute;   }   return *this;}CTime CTime::operator++(int){   CTime temp(*this);   second++;   if(second>=60){    second-=60;    ++minute;   }   return temp;}CTime CTime::operator--(){    if(--second<=0){        second=60;         --minute;        }     return *this;}CTime CTime::operator--(int){    CTime temp(*this);  second--;if(second<=0){        second=60;        --minute;    }  return temp;}CTime CTime::operator+=(CTime &c){   hour+=c.hour;   minute+=c.minute;   second+=c.second;   if(second>=60){   minute=minute+second/60;    second=second%60;if(minute>=60){hour=hour+minute/60;minute=minute%60;} }   return CTime(hour,minute,second);}CTime CTime::operator-=(CTime &c){   hour-=c.hour;   minute-=c.minute;   if(second<c.second){  second=60+second-c.second;      minute-=1;   }   return CTime(hour,minute,second);}CTime CTime::operator+=(int c){second+=c; return CTime(hour,minute,second);}CTime CTime::operator-=(int c){second-=c;  return CTime(hour,minute,second); }void CTime::display(){  cout<<hour<<" "<<minute<<" "<<second<<endl;}  int main(){ CTime t1(8,20,25),t2(11,20,50),t3,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; cout<<"两项相加之后"<<endl;t=t1+t2;t.display();cout<<"两项相减之后"<<endl;t=t2-t1;t.display();cout<<"时间加加之后的景象"<<endl;++t1;t1.display();t=t1++;t.display();cout<<"时间减减之后的景象"<<endl;t=--t2;t.display();t=t2--;t.display();cout<<"+=的应用"<<endl;t2+=t1;t2.display();cout<<"-=的应用"<<endl;t2-=t1;t2.display();t3.setTime(1,2,3);cout<<"加上或是减去之后"<<endl;t3+=2;t3.display();t3-=2;t3.display(); return 0;}

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