What is the use of constructor and destructor? Write a program for illustrating default constructor, parameterized constructor and copy constructor.

Question

Suresh Chand · Accepted Answer

Constructor is used to initialize an object of the class and assign values to data members corresponding to the class. While destructor is used to deallocate the memory of an object of a class. Program Part: Constructor is a member function of class, whose name is same as the class. A constructor is a special type of member function of a class which initializes objects of a class. In C++, Constructor is automatically called when object(instance of class) is created. There are three types of constructor: Default Constructor Parameterized Constructor Copy Constructor Now, We will write a program illustrating the all three types of constructor. // Example: Explicit copy constructor #include <iostream> using namespace std; class Sample{ public: int id; Sample(){ id = 5; cout << 'Default Constructor Called:' << endl; } Sample(int x){ cout << 'nnParameterized Constructor Called:' << endl; id = x; } Sample(Sample &s){ cout << 'nnCopy Constructor Called:' << endl; id = s.id + 5; } void display(){ cout << 'ID = ' << id; } }; int main(){ Sample obj; obj.display(); Sample obj1(10); obj1.display(); Sample obj2(obj1); obj2.display(); return 0; } The output of above program is Default Constructor Called: ID = 5 Parameterized Constructor Called: ID = 10 Copy Constructor Called: ID = 15

What is the use of constructor and destructor? Write a program for illustrating default constructor, parameterized constructor and copy constructor.

Leave your Answer:

Hits Counter

Question

What is the use of constructor and destructor? Write a program for illustrating default constructor, parameterized constructor and copy constructor.

Leave your Answer: