C++类经典三例

cout<<"年龄:"<<age<<"岁"<<endl;
cout<<"身高:"<<height<<"厘米"<<endl ;
cout<<"体重:"<<weight<<"千克"<<endl ;
cout<<endl ;
}
int main()
{
People obj1(8 , 120 , 60) ;
}
ostream &operator<<(ostream &out, const Date &d)
{
out<<d.GetYear()<<"年"<<d.GetMonth()<<"月"<<d.GetDay()<<"日" ;
return out ;
}
istream &operator>>(istream &in , Date &d)
{
Person::Show() ;
cout<<"职称:"<<title<<endl ;
cout<<endl ;
}
} ;
class Cadre:virtual public Person
{
protected :
char post[18] ;
public:
Cadre(char nm[] , int ag , char sx[] ,char pt[])
n +=d.GetDay() ;
return n ;
}
Date Date::NumToDate(int n)
{
int y , m , d ,rest = n ;
for(y = 1 ,rest = n; rest > GetYearDays(y) ; y++)
T.Show() ;
C.Show() ;
TC.Show() ;
system("PAUSE") ;
return 0 ;
}
//3.重载
#include <iostream>
using namespace std ;
class Date
{
private:
int year ;
{
int year , month , day ;
in>>year>>month>>day ;
d = Date(year , month , day) ;
return in ;
}
int main()
{
Date d(2008 , 8 ,18) ;
cout<<"日期:"<<d<<endl ;
case 11:
n = 30 ;
break ;
case 2:
if(IsLeapyear(d.GetYear()))
n = 29 ;
else
n = 28 ;
}
return n ;
}
int Date::DateToNum(const Date&d)
switch(d.GetMonth())
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
n = 31 ;
break ;
case 4:
case 6:
case 9:
return NumToDate(n) ;
}
bool Date::IsLeapyear(int y)
{
if(y % 4 == 0 && y % 100 != 0 || y % 400 == 0 )
return true ;
else
return false ;
protected:
char title[18] ;
public:
Teacher(char nm[] , int ag , char sx[] ,char tl[])
:Person(nm , ag , sx)
{
strcpy(title,tl) ;
}
void Show()const
}
void Show() const ;
static void ShowNum()
{
cout<<"பைடு நூலகம்数 :"<<num<<endl;
}
};
int People::num = 0 ;
void People::Show() const
{
cout<<"第"<<num<<"个人:"<<endl ;
}
static int DateToNum(const Date&d) ;
static Date NumToDate(int n) ;
} ;
ostream &operator<<(ostream &out, const Date &d) ;
istream &operator>>(istream &in , Date &d) ;
{
return day ;
}
Date operator+(int days) ;
Date operator-(int days) ;
static bool IsLeapyear(int y) ;
static int GetYearDays(int y) ;
static int GetMonthDays(const Date &d) ;
char name[18] ;
int age ;
char sex[3] ;
public:
Person(char nm[] , int ag , char sx[])
{
strcpy(name , nm) ;
age = ag ;
strcpy(sex , sx) ;
cout<<"日期 + 10 :"<<d + 10<<endl ;
cout<<"日期 - 10 :"<<d - 10<<endl ;
cout<<"输入日期 :" ;
cin>>d ;
cout<<"日期:"<<d<<endl ;
system("PAUSE") ;
return 0 ;
}
void Show() const
{
cout<<"姓名"<<name<<endl ;
cout<<"年龄"<<age<<endl ;
cout<<"性别"<<sex<<endl ;
}
} ;
class Teacher:virtual public Person
{
obj2.Show() ;
People::ShowNum() ;
system("PAUSE") ;
return 0 ;
}
//2.继承
#include <iostream>
using namespace std ;
class Person
{
protected :
}
} ;
int main()
{
Teacher T("赵毅" , 30 , "男" , "教授");
Cadre C("钱而" , 56 ,"男" , "院长") ;
TeacherCadre TC("钱电视" , 36 ,"男" ,"教授" ,"副院长" , 7000) ;
rest -= GetYearDays(y) ;
for(m = 1 ;rest >GetMonthDays(Date(y , m , 1)) ; m++)
rest -=GetMonthDays(Date(y , m , 1)) ;
d = rest ;
return Date(y , m , d) ;
int month ;
int day ;
public:
Date(int y = 1 , int m = 1,int d = 1):year(y) , month(m) ,day(d){}