Inheritance

Building on Existing Classes

class Animal {
public:
    string name;
    Animal(string n) : name(n) {}
    string speak() { return "..."; }
};

class Dog : public Animal {
public:
    Dog(string n) : Animal(n) {}   // call base constructor
    string speak() { return "Woof!"; }
};

class Cat : public Animal {
public:
    Cat(string n) : Animal(n) {}
    string speak() { return "Meow!"; }
};

Dog d("Rex");
cout << d.name;     // Rex (inherited from Animal)
cout << d.speak();  // Woof!

Access in derived classes

• public — anywhere
• protected — this class + derived classes
• private — this class only

Your Task

Create Shape base class with string color and getColor().
Derive Square (with side) and Triangle (with base and height), each with area().