对不起。很丢脸的问题,关于:
这是一个动态联编的例子.
#include<iostream.h>
class Point
{
public:
Point(double i,double j)
{
x=i;y=j;
}
private:
double x,y;
};
class Rectangle: public Point
{
public:
Rectangle(double i,double j,double k,double l);
virtual double Area() const { return w*h;}
private:
double w,h;
};
Rectangle::Rectangle(double i,double j,double k,double l):Point(i,j)//我现在想知道 -这个":Point(i,j)"有什么用?谢谢
{
w=k;h=l;
}