CPP

destructor in c++

#include <iostream>
class Entity {
	
public:
	float x, y;
	Entity() {
		x = 0.0f;
		y = 0.0f;
      // the above is not a good practice ,instead you can use constructor member initializer list to initialize variables
		std::cout << "Created Entity" << std::endl;
		std::cout << "x " << x << " y " << y << std::endl;
		//This is a constructor and it gets called everytime we instantiate an object
		
	}
	~Entity() {
		//This is a destructor object it gets called every time object is destroyed or its scope ends
		//Note1:that this function can never return anything 
		//Note2:Followed by this ~ symbol the name of the function must be equal to class name
		std::cout << "[Destroyed Entity]" << std::endl;
	}
};

int main(){
	{
		Entity e1;
      //here constructor is called and output => Created Entity 
      //here constructor is called and output => 0,0
	}
  //here Destructor is called and output => Destroyed Entity
  // Destructor will get called here when compiler will get out of the end bracket and the lifetime of object ends
	 // have a graeater look in debug mode
	std::cin.get();
}

what are constructors and destructors c++

class A
{
    // constructor
    A()
    {
        cout << "Constructor called";
    }

    // destructor
    ~A()
    {
        cout << "Destructor called";
    }
};

int main()
{
    A obj1;   // Constructor Called
    int x = 1
    if(x)
    {
        A obj2;  // Constructor Called
    }   // Destructor Called for obj2
} //  Destructor called for obj1

what destructor used for in c++

deallocate and clean up c++ object and class member after get destroyed

constructor destructor code c++

Line::Line( double len): length(len) {
   cout << "Object is being created, length = " << len << endl;
}

constructor destructor code c++

Line::Line( double len): length(len) {
   cout << "Object is being created, length = " << len << endl;
}

c++ destructor

class House {
private:
  std::string location;
  int rooms;
 
public:
  // Constructor with default parameters
  House(std::string loc = "New York", int num = 5) {
    location = loc;
    rooms = num;
  }
 
  void summary() {
    std::cout << location << " house with " << rooms << " rooms.
";
  }
 
  // Destructor
  ~House() {
    std::cout << "Moved away from " << location;
  }
};

c++ destructor

Moved away from New York