<pre name="code" class="cpp">#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 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);//返回s秒后的时间 CTime operator-=(int s);//返回s秒前的时间friend ostream & operator <<(ostream &,CTime &); friend istream & operator >>(istream &,CTime &);}; //下面实现所有的运算符重载代码。 //为简化编程，请注意通过调用已有函数，利用好各函数之间的关系 void CTime::setTime(int h,int m,int s) { hour=h; minute=m; second=s; } void CTime::display() { cout<<hour<<":"<<minute<<":"<<second<<endl; } 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) 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(operator <(t)!=1) return true; else return false; } bool CTime::operator <= (CTime &t) { if(operator >(t)!=1) return true; else return false; } bool CTime::operator == (CTime &t) { if(operator <(t)!=1||operator >(t)!=1) return true; else return false; } bool CTime::operator != (CTime &t) { if(operator <(t)==1||operator >(t)==1) return true; else return false; } CTime CTime::operator+(CTime &c) { CTime c1; c1.second=second+c.second; c1.minute=minute+c.minute; c1.hour=hour+c.hour; if(c1.second>59) { c1.second=c1.second-60; c1.minute=c1.minute+1; } if(c1.minute>59) { c1.minute=c1.minute-60; c1.hour=c1.hour+1; } return c1; } CTime CTime::operator-(CTime &c) { CTime c1; if(operator <(c)==1) { cout<<"因为t1大于t2所以输出错误"<<endl;} else c1.second=second-c.second; c1.minute=minute-c.minute; c1.hour=hour-c.hour; if(c1.second<0) { c1.second=c1.second+60; c1.minute=c1.minute-1; } if(c1.minute<0) { c1.minute=c1.minute+60; c1.hour=c1.hour-1; } return c1; } CTime CTime::operator+(int s) { CTime c1; c1.second=second+s;c1.minute=minute;c1.hour=hour; if(c1.second>59) { c1.second-=60; ++c1.minute; } if(c1.minute>59) { c1.minute-=60; ++c1.hour; } return c1; } CTime CTime::operator-(int s) { CTime c1; c1.second=second;c1.minute=minute;c1.hour=hour; if(c1.second<s) { c1.second+=60; --c1.minute; } if(c1.minute<0) { c1.minute+=60; --c1.hour; } c1.second=second-s; return c1; } CTime CTime::operator++(int) { CTime temp(*this); second++; if(second>59) { second-=60; ++minute; } return temp; } CTime CTime::operator++() { if(++second>59) { second-=60; ++minute; } return *this; } CTime CTime::operator--(int) { CTime temp(*this); second--; return temp; } CTime CTime::operator--() { --second; return *this; } CTime CTime::operator+=(CTime &c) { *this=*this+c; return *this; } CTime CTime::operator-=(CTime &c) { *this=*this-c; return *this; } CTime CTime::operator+=(int s) { *this=*this+s; return *this; } CTime CTime::operator-=(int s) { *this=*this-s; return *this; }
void main() { CTime t1(8,20,25), t2(11,20,50), t; cout << "t1为："; t1.display(); cout << "t2为："; t2.display(); cout << "比较两个时间大小：" << 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; 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(); t = t1; t = t + 35; cout<< "t1 + 35 = "; t .display(); t = t2; t = t - 8; cout<< "t2 - 8 = " ; t.display(); t = t1; t = t ++; cout << endl; cout << "t1++ = "; t.display(); t = t1; t = ++t; cout << "++t1 = "; t.display(); t = t2; t = t --; cout << "t2-- = "; t.display(); t = t2; t = --t; cout << "--t1 = "; t.display(); t = t1; t +=t2; cout << "t1 += t2,t1 = " ; t.display(); t = t2; t -= t1; cout << "t2 -= t1,t2 = " ; t.display(); t = t1; t += 5; cout << "t1 += 5 = " ; t.display(); t = t1; t -= 6; cout << "t1 -= 6 = " ; t.display(); system("pause"); }
