#include <iostream>
using namespace std;
class chang
{
public:
    chang(int h ,int w,int l)
    {
        height=h;
        wide=w;
        lon=l;
    }        
    int volume();
   
private:
    int height;
    int wide;
    int lon;

};
   
int chang::volume(4,4,5)
{
        return (height*wide*lon);
}
   

int main()
{
    chang v1;
    vi.volume;
    cout <<"the volume is :"<<v1.volume<<endle
        return 0;
}

endle
是不是弄错了啊

int chang::volume(4,4,5)

长宽高，求体积

#include <iostream>
using namespace std;
class chang
{
public:      
    int volume(int height,int wide,int lon);
        int V;
private:
    int height;
    int wide;
    int lon;


};
   
int chang::volume(int height,int wide,int lon)
{
    return (height*wide*lon);
}
   

int main()
{
    int V=0;
    chang v1;

        cout <<"the volume is :"<<v1.volume(4,4,5)<<endl;

        return 0;
}
建议你再学习下C++参数传递的三种方式……

#include <iostream>
using namespace std;
class Chang//类名我用的大写
{
public:
    Chang(int h ,int w,int l)
    {
        height=h;
        wide=w;
        lon=l;
    }        
    int volume();
    
private:
    int height;
    int wide;
    int lon;

};
    
int Chang::volume()//这里是函数声明
{
    return (height*wide*lon);
}


int main()
{
    Chang v1(1,2,3);//构造函数
    cout <<"the volume is :"<<v1.volume()<<endl;
    
        return 0;
}

谢了哈