C++ LANGUAGE MULTIPLE INHERITANCE

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C++ LANGUAGE MULTIPLE INHERITANCE

Multiple Inheritance 


A C++ class can inherit members from more than one 
class and here is the extended syntax: 
class derived-class: access baseA, access baseB.... 

Where access is one of public, protected, or private 
and would be given for every base class and they will be 
separated by comma as shown above. Let us try the following example: 

#include <iostream> 
  
using namespace std; 
 
// Base class Shape 
class Shape  
{ 
   public: 
      void setWidth(int w) 
      { 
         width = w; 
      } 
      void setHeight(int h) 
      { 
         height = h; 
      } 
   protected: 
      int width; 
      int height; 
}; 
 
// Base class PaintCost 
class PaintCost  
{ 
   public: 
      int getCost(int area) 
      { 
         return area * 70; 
      } 
}; 
 
// Derived class 
class Rectangle: public Shape, public PaintCost 
{ 
   public: 
      int getArea() 
      {  
         return (width * height);  
      } 
}; 
 
int main(void) 
{ 
   Rectangle Rect; 
   int area; 
  
   Rect.setWidth(5); 
   Rect.setHeight(7); 
 
   area = Rect.getArea(); 
    
   // Print the area of the object. 
   cout << "Total area: " << Rect.getArea() << endl; 
 
   // Print the total cost of painting 
   cout << "Total paint cost: $" << Rect.getCost(area) << endl; 
 
   return 0; 
} 
When the above code is compiled and executed, it produces the following result: 

Total area: 35 
Total paint cost: $2450