Quick Answer

Master classes, inheritance, and polymorphism.

Understanding the Issue

C++ supports OOP with classes, encapsulation, inheritance, and polymorphism. Understanding these concepts is fundamental to C++ development.

The Problem

This code demonstrates the issue:

Cpp Error 
// Need to implement a basic class hierarchy

The Solution

Here's the corrected code:

Cpp Fixed 
#include <iostream>
#include <string>

// Base class
class Animal {
public:
    Animal(const std::string& name) : name(name) {}
    virtual void speak() const = 0; // Pure virtual function
protected:
    std::string name;
};

// Derived class
class Dog : public Animal {
public:
    Dog(const std::string& name) : Animal(name) {}
    void speak() const override {
        std::cout << name << " says Woof!" << std::endl;
    }
};

int main() {
    Dog myDog("Rex");
    myDog.speak();
    return 0;
}

Key Takeaways

Use classes, inheritance, and virtual functions for OOP in C++.