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#include "stdafx.h"
#include "iostream.h"
class Point
{
public:
Point(double i,double j){x=i;y=j;}
double Area() const{return 0.0;}
private:
double x,y;
};
class Rectangle:public Point
{
public:
Rectangle(double i,double j,double k,double l);
double Area()const{return w*h;}
private:
double w,h;
}
Rectangle::Rectangle(double i,double j,double k,double l):Point(i,j)
{
w=k;
h=l;
}
void fun(Point &s)
{
cout<<s.Area()<<endl;
}
void main()
{
Rectangle rec(3.0, 5.2, 15.0, 25.0);
fun(rec);
}
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C:\Program Files\Microsoft Visual Studio\MyProjects\lanshulin31\lanshulin31.cpp(22) : error C2533: 'Rectangle::Rectangle' : constructors not allowed a return type
C:\Program Files\Microsoft Visual Studio\MyProjects\lanshulin31\lanshulin31.cpp(33) : error C2264: 'Rectangle::Rectangle' : error in function definition or declaration; function not called
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1. #include <iostream>
   
2. using namespace std;
   
3. 
   
4. class Point
   
5. {
   
6. public:
   
7. Point(double i = 0, double j = 0)
   
8. {
   
9. x=i;
   
10. y=j;
    
11. }
    
12. private:
    
13. double x, y;
    
14. };
    
15. 
    
16. class Rectangle
    
17. {
    
18. public:
    
19. Rectangle(double i, double j, double k, double l)
    
20. {
    
21. point = Point(i, j);
    
22. w=k;
    
23. h=l;
    
24. }
    
25. double area() const
    
26. {
    
27. return w*h;
    
28. }
    
29. private:
    
30. Point point;
    
31. double w,h;
    
32. };
    
33. 
    
34. 
    
35. int main()
    
36. {
    
37. Rectangle rect(3.0, 5.2, 15.0, 25.0);
    
38. cout<<rect.area()<<endl;
    
39. 
    
40. return 0;
    
41. }
    
42. 
    

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