Question

In C++ a class can have multiple constructors, but only one destructor. Explain why this is the case using code to highlight why.

Answer 1

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CONSTRUCTOR:

• A constructor is a member function whose name is the same as the class name.
• It is used to initialize the objects of the class.
• It is used to allocate memory to an object of the class.
• It may or may not accept the arguments.
• It is called whenever an instance of a class is created.
• There can be many constructors in the class.

SYNTAX:

classname()

{

//constructor's body

}

DESTRUCTOR:

• Like the constructor, the destructor is also a member function of a class that has the same name as the class name but preceded by a tilde (~) operator.
• It helps to deallocate the memory of an object.
• A class will always have a single destructor without any parameters so it can't be overloaded.

SYNTAX:

~classname()

{

//destructor's body

}

REASON:

• The destructor destroys the object as soon as the scope of the object ends.
• The destructor is called automatically by the compiler when the object goes out of the scope.
• Even if you have multiple constructors you only need one destructor to destroy the object.

NOTE:

Example: you have an apple and an orange ( multiple constructor ) but you need only one knife to cut it where you will never use two knives to cut two fruits.

PROGRAM:

class A

{

//constructor

A()

{

cout<<"constructor called";

}

//constructor1

A(int)

{

cout<< " constructor1 called";

}

//destructor

~A()

{

cout<< " destructor called";

}

};

int main ()

{

A obj1; // constructor called

int obj2;

A obj2; //constructor1 called

} // object gets out of scope so destructor will be called for both objects.

OUTPUT:

constructor called

constructor1 called

destructor called

destructor called