带参数的构造函数

#include<iostream>
#include<string>
#include<cstdlib>
using namespace std;
class Box
{
    public:
        Box(int,int,int);
        int volume();
    private:
       int height;
       int width;
       int length;
};
Box::Box(int x,int y,int z)
{
   height=x;
   width=y;
   length=z;
}
int Box::volume( )
{
    return (height*width*length);
}
int main()
{
    Box box1(12,25,30);
    cout<<box1.volume()<<endl;
    Box box2(15,30,21);
    cout<<box2.volume()<<endl;
    system("pause");
    return 0;
} 

/*

用参数初始化对数据成员初始化

定义构造函数可以改用以下形式，

Box::Box(int h,int w,int len): height(x),width(y),length(len){}

*/