A simple class hierarchy. : class hierarchy « Class « C++ Tutorial

1. C++ Tutorial
2. Class
3. class hierarchy

#include <iostream> 
#include <cstring> 
using namespace std; 
 
class Shape { 
public: 
  double width; 
  double height; 
 
  void display() { 
    cout << "Width and height are " <<  width << " and " << height << "\n"; 
  } 
}; 
 
// Triangle is derived from Shape. 
class Triangle : public Shape { 
public: 
  char style[20]; 
   
  double area() { 
    return width * height / 2; 
  } 
 
  void showStyle() { 
    cout << "Triangle is " << style << "\n"; 
  } 
}; 
 
int main() { 
  Triangle t1; 
  Triangle t2; 
 
  t1.width = 4.0; 
  t1.height = 4.0; 
  strcpy(t1.style, "isosceles"); 
 
  t2.width = 8.0; 
  t2.height = 12.0; 
  strcpy(t2.style, "right"); 
 
  t1.showStyle(); 
  t1.display(); 
  cout << "Area is " << t1.area() << "\n"; 
 
  t2.showStyle(); 
  t2.display(); 
  cout << "Area is " << t2.area() << "\n"; 
 
  return 0; 
}

Triangle is isosceles
Width and height are 4 and 4
Area is 8
Triangle is right
Width and height are 8 and 12
Area is 48