第九周C++报告二。定义Time类中的运算符重载，实现时间的输入输出
【任务2】接第8周任务2，定义Time类中的<<和>>运算符重载，实现时间的输入输出，改造原程序中对运算结果显示方式，使程序读起来更自然
#include
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);
friend ostream& operator << (ostream& output, CTime& c);
friend istream& operator >> (istream& input, CTime& c);
//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
};
//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
istream& operator >> (istream& input, CTime& c)
{
char c1;
input >> c.hour >> c1 >>c.minute >> c1 >> c.second;
return input;
}
ostream& operator << (ostream& output, CTime& c)
{
output < (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((*this) > t || (*this) == t)
{
return true;
}
else
{
return false;
}
}
bool CTime::operator <= (CTime &t)
{
if((*this) < t || (*this) == t)
{
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 true;
}
else
{
return false;
}
}
CTime CTime::operator + (CTime &c)
{
CTime t(*this);
t.second+= c.second;
if (t.second >= 60)
{
t.minute+= t.second/60;
t.second%= 60;
}
t.minute+= c.minute;
if (t.minute>=60)
{
t.hour+= t.minute/60;
t.minute%= 60;
}
t.hour+= c.hour;
if (t.hour>23)
{
t.hour%=24;
}
return t;
}
CTime CTime::operator - (CTime &c)
{
CTime t(*this);
if (t.second < c.second)
{
t.second+= 60;
t.second-= c.second;
t.minute-= 1;
}
else
{
t.second-= c.second;
}
if (t.minute < c.minute)
{
t.minute+= 60;
t.minute-= c.minute;
t.hour-= 1;
}
else
{
t.minute-= c.minute;
}
if (t.hour < c.hour)
{
t.hour+=24;
t.hour-= c.hour;
}
else
{
t.hour-= c.hour;
}
return t;
}
CTime CTime::operator + (int s)
{
CTime t(*this);
t.second+= s;
if(t.second >= 60)
{
t.minute = second / 60 + minute;
t.second = second % 60;
if(t.minute >= 60)
{
t.hour = hour + minute / 60;
t.minute = minute % 60;
if(t.hour >= 24)
{
t.hour%= 24;
}
}
}
return t;
}
CTime CTime::operator - (int s)
{
CTime t(*this);
int x;
x = t.hour * 3600 + t.minute * 60 + t.second;
x = x - s;
t.hour = x / 3600;
x = x % 3600;
t.minute = x / 60;
t.second = x % 60;
return t;
}
CTime CTime::operator ++ (int)//后置++，下一秒
{
CTime t(*this);
int x;
x = hour * 3600 + minute * 60 + second;
x = x + 1;
hour = x / 3600;
x = x % 3600;
minute = x / 60;
second = x % 60;
return t;
}
CTime CTime::operator ++ ()//前置++，下一秒
{
CTime t(*this);
int x;
x = hour * 3600 + minute * 60 + second;
x = x + 1;
hour = x / 3600;
x = x % 3600;
minute = x / 60;
second = x % 60;
return (*this);
}
CTime CTime::operator -- (int)//后置--，前一秒
{
CTime t(*this);
int x;
x = hour * 3600 + minute * 60 + second;
x = x - 1;
hour = x / 3600;
x = x % 3600;
minute = x / 60;
second = x % 60;
return t;
}
CTime CTime::operator -- ()//前置--，前一秒
{
CTime t(*this);
int x;
x = hour * 3600 + minute * 60 + second;
x = x - 1;
hour = x / 3600;
x = x % 3600;
minute = x / 60;
second = x % 60;
return (*this);
}
CTime CTime::operator+= (CTime &c)
{
second+= c.second;
if (second >= 60)
{
minute+= second/60;
second%= 60;
}
minute+= c.minute;
if (minute>=60)
{
hour+= minute/60;
minute%= 60;
}
hour+= c.hour;
if (hour>23)
{
hour%=24;
}
return (*this);
}
CTime CTime::operator-= (CTime &c)
{
if (second < c.second)
{
second+= 60;
second-= c.second;
minute-= 1;
}
else
{
second-= c.second;
}
if (minute < c.minute)
{
minute+= 60;
minute-= c.minute;
hour-= 1;
}
else
{
minute-= c.minute;
}
if (hour < c.hour)
{
hour+=24;
hour-= c.hour;
}
else
{
hour-= c.hour;
}
return (*this);
}
CTime CTime::operator+= (int s)//返回s秒后的时间
{
second+= s;
if(second >= 60)
{
minute = second / 60 + minute;
second = second % 60;
if(minute >= 60)
{
hour = hour + minute / 60;
minute = minute % 60;
if(hour >= 24)
{
hour%= 24;
}
}
}
return (*this);
}
CTime CTime::operator-= (int s)//返回s秒前的时间
{
int x;
x = hour * 3600 + minute * 60 + second;
x = x - s;
hour = x / 3600;
x = x % 3600;
minute = x / 60;
second = x % 60;
return (*this);
}
void main()
{
CTime t1(8,20,25),t2(11,20,50),t;
cout<<"t1为：";
cout <t2) cout<<"t1>t2"<=t2) cout<<"t1≥t2"<