____ are functions with the same class name as constructors but preceded with a tilde (~).

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Constructor: 
A constructor is a member function of a class that has the same name as the class name. It helps to initialize the object of a class. It can either accept the arguments or not. It is used to allocate the memory to an object of the class. It is called whenever an instance of the class is created. It can be defined manually with arguments or without arguments. There can be many constructors in a class. It can be overloaded but it can not be inherited or virtual. There is a concept of copy constructor which is used to initialize an object from another object. 
Syntax:  

  ClassName()
   {
     //Constructor's Body 
   } 

Destructor: 
Like a constructor, Destructor is also a member function of a class that has the same name as the class name preceded by a tilde(~) operator. It helps to deallocate the memory of an object. It is called while the object of the class is freed or deleted. In a class, there is always a single destructor without any parameters so it can’t be overloaded. It is always called in the reverse order of the constructor. if a class is inherited by another class and both the classes have a destructor then the destructor of the child class is called first, followed by the destructor of the parent or base class. 
Syntax:  

  ~ClassName()
   { 
       //Destructor's Body
   }

Note: If we do not specify any access modifiers for the members inside the class then by default the access modifier for the members will be Private. 
Example/Implementation of Constructor and Destructor: 

C++

#include <iostream>

using namespace std;

class Z

{

public:

    Z()

    {

        cout<<"Constructor called"<<endl;

    }

    ~Z()

    {

        cout<<"Destructor called"<<endl;

    }

};

int main()

{

    Z z1;  

    int a = 1;

    if(a==1)

    {

        Z z2; 

    } 

}

Output:  

Constructor called
Constructor called
Destructor called
Destructor called 

Difference between Constructor and Destructor in C++ :