类外定义成员函数实例

①volume.h

 

#include <iostream>

using namespace std;

 

class volume

{

public:

double length;

double width;

double height;

double countvolume();

void setarg();

void display();

};

 

 

 

②volume.cpp

 

#include"stdafx.h"

#include<iostream>

#include"volume.h"

using namespace std;

 

double volume::countvolume()

{

double y=(length*width*height);

return y;

}

 

void volume::display()

{

double y=volume::countvolume();

cout<<"The Volume is "<<y<<endl;

}

 

void volume::setarg()

{

cout<<"Please Enter length , width , heigth "<<endl;

cin>>length>>width>>height;

cout<<endl;

}

 

 

③main函数

 

 

#include "stdafx.h"

#include<iostream>

#include"volume.h"

using namespace std;

 

 

int _tmain(int argc, _TCHAR* argv[])

{

volume v1;

v1.setarg();

v1.countvolume();

v1.display();

return 0;

}