第二章
类体内定义成员函数
#include <iostream>
using namespace std;
class Time
{
public:
void set_time();
void show_time();
private: //成员改为公用的
int hour;
int minute;
int sec;
};
void Time::set_time() //在main函数之前定义
{
cin>>hour;
cin>>minute;
cin>>sec;
}
void Time::show_time() //在main函数之前定义
{
cout<<hour<<":"<<minute<<":"<<sec<<endl;
}
int main()
{Time t1;
t1.set_time();
t1.show_time();
return 0;
}
2：
2.3 改写2.2：类体内声明成员函数，类外定义成员函数
#include <iostream>
using namespace std;
class Time
{public:
void set_time(void)
{cin>>hour;
cin>>minute;
cin>>sec;
}
void show_time(void)
{cout<<hour<<":"<<minute<<":"<<sec<<endl;}
private: int hour;
int minute;
int sec;
};
c++面向对象程序设计 答案
Time t;
int main()
{
t.set_time();
t.show_time();
return 0;
}
c++面向对象程序设计 谭浩强
3：
#include <iostream>
using namespace std;
class Time
{public:
void set_time(void);
void show_time(void);
private:
int hour;
int minute;
int sec;
};
c++面向对象程序设计 谭浩强
void Time::set_time(void)
{cin>>hour;
cin>>minute;
cin>>sec;
}
void Time::show_time(void)
{cout<<hour<<":"<<minute<<":"<<sec<<endl;}
Time t;
int main()
{ t.set_time();
t.show_time();
return 0;
}
4：
//xt2-4-1.cpp(main.cpp)
#include <iostream>
using namespace std;
#include "xt2-4.h"
int main()
{Student stud;
stud.set_value();
stud.display();
return 0;
}
//xt2-4-2.cpp(即student.cpp)
#include "xt2-4.h" //在此文件中进行函数的定义
#include <iostream>
using namespace std; //不要漏写此行
void Student::display( )
{ cout<<"num:"<<num<<endl;
cout<<"name:"<<name<<endl;
cout<<"sex:"<<sex<<endl;
}
void Student::set_value()
{ cin>>num;
cin>>name;
cin>>sex;
}
5：
//xt2-5-1.cpp(file1.cpp)
#include <iostream>
#include "xt2-5.h"
int main()
{Array_max arrmax;
arrmax.set_value();
arrmax.max_value();
arrmax.show_value();
return 0;
}
//xt2-5-2.cpp(arraymax.cpp)
#include <iostream>
using namespace std;
#include "xt2-5.h"
void Array_max::set_value()
{ int i;
for (i=0;i<10;i++)
cin>>array[i];
}
void Array_max::max_value()
{int i;
max=array[0];
for (i=1;i<10;i++)
if(array[i]>max) max=array[i];
}
void Array_max::show_value()
{cout<<"max="<<max<<endl;
}
6：解法一
#include <iostream>
using namespace std;
class Box
{public:
void get_value();
float volume();
void display();
public:
float lengh;
float width;
float height;
};
void Box::get_value()
{ cout<<"please input lengh, width,height:";
cin>>lengh;
cin>>width;
cin>>height;
}
float 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:
float lengh;
float width;
float height;
float 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;
}