7
Eoat Box::volume()
{ return(lengh*width*height
);}
void Box::display()
{ cout<<volume()<<endl;}
int main()
{Box box1,box2,box3;
box1.get_value();
cout<<"volmue of bax1 is ";
box1.display();
box2.get_value();
cout<<"volmue of bax2 is ";
box2.display();
box3.get_value();
cout<<"volmue of bax3 is ";
box3.display();
return 0;
}
解法二:
#include <iostream>
using namespace std;
class Box
{public:
void get_value();
void volume();
void display();
public:
Eoat lengh;
Eoat width;
Eoat height;
Eoat vol;
};
void Box::get_value()
{ cout<<"please input lengh,
width,height:";
cin>>lengh;
cin>>width;
cin>>height;
}
void Box::volume()
{ vol=lengh*width*height;}
void Box::display()
{ cout<<vol<<endl;}
int main()
{Box box1,box2,box3;
box1.get_value();
box1.volume();
cout<<"volmue of bax1 is ";
box1.display();
box2.get_value();
box2.volume();
cout<<"volmue of bax2 is ";
box2.display();
box3.get_value();
box3.volume();
cout<<"volmue of bax3 is ";
box3.display();
return 0;
}
第三章
2:
#include <iostream>
using namespace std;
class Date
{public:
Date(int,int,int);
Date(int,int);
Date(int);
Date();
void display();
private:
int month;
int day;
int year;
};
Date::Date(int m,int d,int
y):month(m),day(d),year(y)
{ }
Date::Date(int m,int
d):month(m),day(d)
{year=2005;}
Date::Date(int m):month(m)
{day=1;
year=2005;
}
Date::Date()
{month=1;
day=1;
year=2005;
}
void Date::display()
{cout<<month<<"/"<<day<<
"/"<<year<<endl;}
int main()
{
Date d1(10,13,2005);
Date d2(12,30);
Date d3(10);
Date d4;
d1.display();
d2.display();
d3.display();
d4.display();
return 0;
}
3:
#include <iostream>
using namespace std;
class Date
{public:
Date(int=1,int=1,int=2005);
void display();
private:
int month;
int day;
int year;