2.6

#include <iostream>
#include"v_sum.h"
using namespace std;
int main() 
{
v_sum v1,v2,v3;
int v_sum1,v_sum2,v_sum3;
v1.get();
v_sum1=v1.getv();
v2.get();
v_sum2=v2.getv();
v3.get();
v_sum3=v3.getv();
cout<<"v1="<<v_sum1<<endl<<"v2="<<v_sum2<<endl<<"v3="<<v_sum3;
return 0;
}
//v_sum.h
using namespace std;
class v_sum
{
public:
void get();
int getv();
private:
int lengh;
int width;
int height;
};
//v_sum.cpp
#include<iostream>
#include"v_sum.h"
using namespace std;
void v_sum::get()
{
cout<<"请输入长宽高"<<endl;
cin>>lengh>>width>>height;
cout<<"lengh="<<lengh<<endl<<"width="<<width<<endl<<"height="<<height<<endl; 
}
int  v_sum::getv()
{
int v=0;
v=lengh*width*height;
return v;
}