C++ Classes & Objects

class Vehicle {
  public:
    string brand = "Ford";
    void honk() {
      cout << "Tuut, tuut!" << endl;
    }
};
class Car : public Vehicle {
  public:
    string model = "Mustang";
};
Car myCar;
myCar.honk();  // Output "Tuut, tuut!"
cout << myCar.brand + " " + myCar.model << endl;  // Output "Ford Mustang"

class MyClass {
  private:
    int myNum;
  public:
    void setMyNum(int num) {  // Setter
      myNum = num;
    }
    int getMyNum() {  // Getter
      return myNum;
    }
};
MyClass myObj;
myObj.setMyNum(15);  // Set the value of myNum to 15
cout << myObj.getMyNum() << endl;  // Output 15

class MyClass {
  public:     // Public access specifier
    int x;    // Public attribute
  private:    // Private access specifier
    int y;    // Private attribute
  protected:  // Protected access specifier
    int z;    // Protected attribute
};
MyClass myObj;
myObj.x = 25;  // Allowed (public)
myObj.y = 50;  // Not allowed (private)
myObj.z = 75;  // Not allowed (protected)

class MyClass {
  public:
    int myNum;
    string myString;
    void myMethod() {  // Method/function defined inside the class
      cout << "Hello World!" << endl;
    }
};
MyClass myObj;  // Create an object of MyClass
myObj.myMethod();  // Call the method

class MyClass {
  public:
    int myNum;
    string myString;
    MyClass() {  // Constructor
      myNum = 0;
      myString = "";
    }
    ~MyClass() {  // Destructor
      cout << "Object destroyed." << endl;
    }
};
MyClass myObj;  // Create an object of MyClass
// Code here...
// Object is destroyed automatically when the program exits the scope

class MyClass {
  public:
    int myNum;
    string myString;
    MyClass() {  // Constructor
      myNum = 0;
      myString = "";
    }
};
MyClass myObj;  // Create an object of MyClass
cout << myObj.myNum << endl;         // Output 0
cout << myObj.myString << endl;      // Output ""

MyClass myObj;  // Create an object of MyClass
myObj.myNum = 15;          // Set the value of myNum to 15
myObj.myString = "Hello";  // Set the value of myString to "Hello"
cout << myObj.myNum << endl;         // Output 15
cout << myObj.myString << endl;      // Output "Hello"

class MyClass {
  public:             // Access specifier
    int myNum;        // Attribute (int variable)
    string myString;  // Attribute (string variable)
};